llmaniprotate.cpp

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#include "llviewerprecompiledheaders.h"

#include "llmaniprotate.h"

// library includes
#include "llmath.h"
#include "llgl.h"
#include "llglimmediate.h"
#include "v4color.h"
#include "llprimitive.h"
#include "llview.h"
#include "llfontgl.h"

// viewer includes
#include "llagent.h"
#include "llbox.h"
#include "llbutton.h"
#include "llviewercontrol.h"
#include "llcriticaldamp.h"
#include "llhoverview.h"
#include "llfloatertools.h"
#include "llselectmgr.h"
#include "llstatusbar.h"
#include "llui.h"
#include "llvoavatar.h"
#include "llviewercamera.h"
#include "llviewerobject.h"
#include "llviewerobject.h"
#include "llviewerwindow.h"
#include "llworld.h"
#include "pipeline.h"
#include "lldrawable.h"
#include "llglheaders.h"

const F32 RADIUS_PIXELS = 100.f;                // size in screen space
const F32 SQ_RADIUS = RADIUS_PIXELS * RADIUS_PIXELS;
const F32 WIDTH_PIXELS = 8;
const S32 CIRCLE_STEPS = 100;
const F32 DELTA = F_TWO_PI / CIRCLE_STEPS;
const F32 SIN_DELTA = sin( DELTA );
const F32 COS_DELTA = cos( DELTA );
const F32 MAX_MANIP_SELECT_DISTANCE = 100.f;
const F32 SNAP_ANGLE_INCREMENT = 5.625f;
const F32 SNAP_ANGLE_DETENTE = SNAP_ANGLE_INCREMENT;
const F32 SNAP_GUIDE_RADIUS_1 = 2.8f;
const F32 SNAP_GUIDE_RADIUS_2 = 2.4f;
const F32 SNAP_GUIDE_RADIUS_3 = 2.2f;
const F32 SNAP_GUIDE_RADIUS_4 = 2.1f;
const F32 SNAP_GUIDE_RADIUS_5 = 2.05f;
const F32 SNAP_GUIDE_INNER_RADIUS = 2.f;
const F32 AXIS_ONTO_CAM_TOLERANCE = cos( 80.f * DEG_TO_RAD );
const F32 SELECTED_MANIPULATOR_SCALE = 1.05f;
const F32 MANIPULATOR_SCALE_HALF_LIFE = 0.07f;

extern void handle_reset_rotation(void*);  // in LLViewerWindow

LLManipRotate::LLManipRotate( LLToolComposite* composite )
:       LLManip( "Rotate", composite ),
        mRotationCenter(),
        mCenterScreen(),
        mRotation(),
        mMouseDown(),
        mMouseCur(),
        mRadiusMeters(0.f),
        mCenterToCam(),
        mCenterToCamNorm(),
        mCenterToCamMag(0.f),
        mCenterToProfilePlane(),
        mCenterToProfilePlaneMag(0.f),
        mManipPart( LL_NO_PART ),
        mSendUpdateOnMouseUp( FALSE ),
        mSmoothRotate( FALSE ),
        mCamEdgeOn(FALSE),
        mManipulatorScales(1.f, 1.f, 1.f, 1.f)
{ }

void LLManipRotate::handleSelect()
{
        // *FIX: put this in mouseDown?
        LLSelectMgr::getInstance()->saveSelectedObjectTransform(SELECT_ACTION_TYPE_PICK);
        gFloaterTools->setStatusText("rotate");
        LLManip::handleSelect();
}

void LLManipRotate::handleDeselect()
{
        mHighlightedPart = LL_NO_PART;
        mManipPart = LL_NO_PART;
        LLManip::handleDeselect();
}

void LLManipRotate::render()
{
        LLGLSUIDefault gls_ui;
        LLGLSNoTexture gls_no_texture;
        LLGLDepthTest gls_depth(GL_TRUE);
        LLGLEnable gl_blend(GL_BLEND);
        LLGLEnable gls_alpha_test(GL_ALPHA_TEST);
        
        // You can rotate if you can move
        LLViewerObject* first_object = mObjectSelection->getFirstMoveableObject(TRUE);
        if( !first_object )
        {
                return;
        }

        if( !updateVisiblity() )
        {
                return;
        }

        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
        {
                F32 zoom = gAgent.getAvatarObject()->mHUDCurZoom;
                glScalef(zoom, zoom, zoom);
        }


        LLVector3 center = gAgent.getPosAgentFromGlobal( mRotationCenter );

        LLColor4 highlight_outside( 1.f, 1.f, 0.f, 1.f );
        LLColor4 highlight_inside( 0.7f, 0.7f, 0.f, 0.5f );
        F32 width_meters = WIDTH_PIXELS * mRadiusMeters / RADIUS_PIXELS;

        glPushMatrix();
        {
                // are we in the middle of a constrained drag?
                if (mManipPart >= LL_ROT_X && mManipPart <= LL_ROT_Z)
                {
                        renderSnapGuides();
                }
                else
                {
                        LLGLEnable cull_face(GL_CULL_FACE);
                        LLGLDepthTest gls_depth(GL_FALSE);
                        glPushMatrix();
                        {
                                // Draw "sphere" (intersection of sphere with tangent cone that has apex at camera)
                                glTranslatef( mCenterToProfilePlane.mV[VX], mCenterToProfilePlane.mV[VY], mCenterToProfilePlane.mV[VZ] );
                                glTranslatef( center.mV[VX], center.mV[VY], center.mV[VZ] );

                                // Inverse change of basis vectors
                                LLVector3 forward = mCenterToCamNorm;
                                LLVector3 left = gAgent.getUpAxis() % forward;
                                left.normVec();
                                LLVector3 up = forward % left;

                                LLVector4 a(-forward);
                                a.mV[3] = 0;
                                LLVector4 b(up);
                                b.mV[3] = 0;
                                LLVector4 c(left);
                                c.mV[3] = 0;
                                LLMatrix4 mat;
                                mat.initRows(a, b, c, LLVector4(0.f, 0.f, 0.f, 1.f));

                                glMultMatrixf( &mat.mMatrix[0][0] );

                                glRotatef( -90, 0.f, 1.f, 0.f);
                                LLColor4 color;
                                if (mManipPart == LL_ROT_ROLL || mHighlightedPart == LL_ROT_ROLL)
                                {
                                        color.setVec(0.8f, 0.8f, 0.8f, 0.8f);
                                        glScalef(mManipulatorScales.mV[VW], mManipulatorScales.mV[VW], mManipulatorScales.mV[VW]);
                                }
                                else
                                {
                                        color.setVec( 0.7f, 0.7f, 0.7f, 0.6f );
                                }
                                gl_washer_2d(mRadiusMeters + width_meters, mRadiusMeters, CIRCLE_STEPS, color, color);


                                if (mManipPart == LL_NO_PART)
                                {
                                        gGL.color4f( 0.7f, 0.7f, 0.7f, 0.3f );
                                        gl_circle_2d( 0, 0,  mRadiusMeters, CIRCLE_STEPS, TRUE );
                                }
                                
                                GLdouble plane_eqn[] = { 0, 0, 1, 0 };
                                glClipPlane( GL_CLIP_PLANE0, plane_eqn );
                        }
                        glPopMatrix();
                }

                glTranslatef( center.mV[VX], center.mV[VY], center.mV[VZ] );

                LLQuaternion rot;
                F32 angle_radians, x, y, z;

                LLVector3 grid_origin;
                LLVector3 grid_scale;
                LLQuaternion grid_rotation;

                LLSelectMgr::getInstance()->getGrid(grid_origin, grid_rotation, grid_scale);

                grid_rotation.getAngleAxis(&angle_radians, &x, &y, &z);
                glRotatef(angle_radians * RAD_TO_DEG, x, y, z);


                if (mManipPart == LL_ROT_Z)
                {
                        mManipulatorScales = lerp(mManipulatorScales, LLVector4(1.f, 1.f, SELECTED_MANIPULATOR_SCALE, 1.f), LLCriticalDamp::getInterpolant(MANIPULATOR_SCALE_HALF_LIFE));
                        glPushMatrix();
                        {
                                // selected part
                                glScalef(mManipulatorScales.mV[VZ], mManipulatorScales.mV[VZ], mManipulatorScales.mV[VZ]);
                                renderActiveRing( mRadiusMeters, width_meters, LLColor4( 0.f, 0.f, 1.f, 1.f) , LLColor4( 0.f, 0.f, 1.f, 0.3f ));
                        }
                        glPopMatrix();
                }
                else if (mManipPart == LL_ROT_Y)
                {
                        mManipulatorScales = lerp(mManipulatorScales, LLVector4(1.f, SELECTED_MANIPULATOR_SCALE, 1.f, 1.f), LLCriticalDamp::getInterpolant(MANIPULATOR_SCALE_HALF_LIFE));
                        glPushMatrix();
                        {
                                glRotatef( 90.f, 1.f, 0.f, 0.f );
                                glScalef(mManipulatorScales.mV[VY], mManipulatorScales.mV[VY], mManipulatorScales.mV[VY]);
                                renderActiveRing( mRadiusMeters, width_meters, LLColor4( 0.f, 1.f, 0.f, 1.f), LLColor4( 0.f, 1.f, 0.f, 0.3f));
                        }
                        glPopMatrix();
                }
                else if (mManipPart == LL_ROT_X)
                {
                        mManipulatorScales = lerp(mManipulatorScales, LLVector4(SELECTED_MANIPULATOR_SCALE, 1.f, 1.f, 1.f), LLCriticalDamp::getInterpolant(MANIPULATOR_SCALE_HALF_LIFE));
                        glPushMatrix();
                        {
                                glRotatef( 90.f, 0.f, 1.f, 0.f );
                                glScalef(mManipulatorScales.mV[VX], mManipulatorScales.mV[VX], mManipulatorScales.mV[VX]);
                                renderActiveRing( mRadiusMeters, width_meters, LLColor4( 1.f, 0.f, 0.f, 1.f), LLColor4( 1.f, 0.f, 0.f, 0.3f));
                        }
                        glPopMatrix();
                }
                else if (mManipPart == LL_ROT_ROLL)
                {
                        mManipulatorScales = lerp(mManipulatorScales, LLVector4(1.f, 1.f, 1.f, SELECTED_MANIPULATOR_SCALE), LLCriticalDamp::getInterpolant(MANIPULATOR_SCALE_HALF_LIFE));
                }
                else if (mManipPart == LL_NO_PART)
                {
                        if (mHighlightedPart == LL_NO_PART)
                        {
                                mManipulatorScales = lerp(mManipulatorScales, LLVector4(1.f, 1.f, 1.f, 1.f), LLCriticalDamp::getInterpolant(MANIPULATOR_SCALE_HALF_LIFE));
                        }

                        LLGLEnable cull_face(GL_CULL_FACE);
                        LLGLEnable clip_plane0(GL_CLIP_PLANE0);
                        LLGLDepthTest gls_depth(GL_FALSE);

                        // First pass: centers. Second pass: sides.
                        for( S32 i=0; i<2; i++ )
                        {
                                glPushMatrix();
                                {
                                        if (mHighlightedPart == LL_ROT_Z)
                                        {
                                                mManipulatorScales = lerp(mManipulatorScales, LLVector4(1.f, 1.f, SELECTED_MANIPULATOR_SCALE, 1.f), LLCriticalDamp::getInterpolant(MANIPULATOR_SCALE_HALF_LIFE));
                                                glScalef(mManipulatorScales.mV[VZ], mManipulatorScales.mV[VZ], mManipulatorScales.mV[VZ]);
                                                // hovering over part
                                                gl_ring( mRadiusMeters, width_meters, LLColor4( 0.f, 0.f, 1.f, 1.f ), LLColor4( 0.f, 0.f, 1.f, 0.5f ), CIRCLE_STEPS, i);
                                        }
                                        else
                                        {
                                                // default
                                                gl_ring( mRadiusMeters, width_meters, LLColor4( 0.f, 0.f, 0.8f, 0.8f ), LLColor4( 0.f, 0.f, 0.8f, 0.4f ), CIRCLE_STEPS, i);
                                        }
                                }
                                glPopMatrix();

                                glPushMatrix();
                                {
                                        glRotatef( 90.f, 1.f, 0.f, 0.f );
                                        if (mHighlightedPart == LL_ROT_Y)
                                        {
                                                mManipulatorScales = lerp(mManipulatorScales, LLVector4(1.f, SELECTED_MANIPULATOR_SCALE, 1.f, 1.f), LLCriticalDamp::getInterpolant(MANIPULATOR_SCALE_HALF_LIFE));
                                                glScalef(mManipulatorScales.mV[VY], mManipulatorScales.mV[VY], mManipulatorScales.mV[VY]);
                                                // hovering over part
                                                gl_ring( mRadiusMeters, width_meters, LLColor4( 0.f, 1.f, 0.f, 1.f ), LLColor4( 0.f, 1.f, 0.f, 0.5f ), CIRCLE_STEPS, i);
                                        }
                                        else
                                        {
                                                // default
                                                gl_ring( mRadiusMeters, width_meters, LLColor4( 0.f, 0.8f, 0.f, 0.8f ), LLColor4( 0.f, 0.8f, 0.f, 0.4f ), CIRCLE_STEPS, i);
                                        }                                               
                                }
                                glPopMatrix();

                                glPushMatrix();
                                {
                                        glRotatef( 90.f, 0.f, 1.f, 0.f );
                                        if (mHighlightedPart == LL_ROT_X)
                                        {
                                                mManipulatorScales = lerp(mManipulatorScales, LLVector4(SELECTED_MANIPULATOR_SCALE, 1.f, 1.f, 1.f), LLCriticalDamp::getInterpolant(MANIPULATOR_SCALE_HALF_LIFE));
                                                glScalef(mManipulatorScales.mV[VX], mManipulatorScales.mV[VX], mManipulatorScales.mV[VX]);
        
                                                // hovering over part
                                                gl_ring( mRadiusMeters, width_meters, LLColor4( 1.f, 0.f, 0.f, 1.f ), LLColor4( 1.f, 0.f, 0.f, 0.5f ), CIRCLE_STEPS, i);
                                        }
                                        else
                                        {
                                                // default
                                                gl_ring( mRadiusMeters, width_meters, LLColor4( 0.8f, 0.f, 0.f, 0.8f ), LLColor4( 0.8f, 0.f, 0.f, 0.4f ), CIRCLE_STEPS, i);
                                        }
                                }
                                glPopMatrix();

                                if (mHighlightedPart == LL_ROT_ROLL)
                                {
                                        mManipulatorScales = lerp(mManipulatorScales, LLVector4(1.f, 1.f, 1.f, SELECTED_MANIPULATOR_SCALE), LLCriticalDamp::getInterpolant(MANIPULATOR_SCALE_HALF_LIFE));
                                }
                        }
                }
        }
        glPopMatrix();
        glPopMatrix();

        LLVector3 euler_angles;
        LLQuaternion object_rot = first_object->getRotationEdit();
        object_rot.getEulerAngles(&(euler_angles.mV[VX]), &(euler_angles.mV[VY]), &(euler_angles.mV[VZ]));
        euler_angles *= RAD_TO_DEG;
        euler_angles.mV[VX] = llround(fmodf(euler_angles.mV[VX] + 360.f, 360.f), 0.05f);
        euler_angles.mV[VY] = llround(fmodf(euler_angles.mV[VY] + 360.f, 360.f), 0.05f);
        euler_angles.mV[VZ] = llround(fmodf(euler_angles.mV[VZ] + 360.f, 360.f), 0.05f);

        renderXYZ(euler_angles);
}

BOOL LLManipRotate::handleMouseDown(S32 x, S32 y, MASK mask)
{
        BOOL    handled = FALSE;

        LLViewerObject* first_object = mObjectSelection->getFirstMoveableObject(TRUE);
        if( first_object )
        {
                LLViewerObject* hit_obj = gViewerWindow->lastObjectHit();
                if( hit_obj && mHighlightedPart != LL_NO_PART )
                {
                        handled = handleMouseDownOnPart( x, y, mask );
                }
        }

        return handled;
}

// Assumes that one of the parts of the manipulator was hit.
BOOL LLManipRotate::handleMouseDownOnPart( S32 x, S32 y, MASK mask )
{
        BOOL can_rotate = canAffectSelection();
        if (!can_rotate)
        {
                return FALSE;
        }

        highlightManipulators(x, y);
        S32 hit_part = mHighlightedPart;
        // we just started a drag, so save initial object positions
        LLSelectMgr::getInstance()->saveSelectedObjectTransform(SELECT_ACTION_TYPE_ROTATE);

        // save selection center
        mRotationCenter = gAgent.getPosGlobalFromAgent( getPivotPoint() ); //LLSelectMgr::getInstance()->getSelectionCenterGlobal();

        mManipPart = (EManipPart)hit_part;
        LLVector3 center = gAgent.getPosAgentFromGlobal( mRotationCenter );

        if( mManipPart == LL_ROT_GENERAL)
        {
                mMouseDown = intersectMouseWithSphere( x, y, center, mRadiusMeters);
        }
        else
        {
                // Project onto the plane of the ring
                LLVector3 axis = getConstraintAxis();

                F32 axis_onto_cam = llabs( axis * mCenterToCamNorm );
                const F32 AXIS_ONTO_CAM_TOL = cos( 85.f * DEG_TO_RAD );
                if( axis_onto_cam < AXIS_ONTO_CAM_TOL )
                {
                        LLVector3 up_from_axis = mCenterToCamNorm % axis;
                        up_from_axis.normVec();
                        LLVector3 cur_intersection;
                        getMousePointOnPlaneAgent(cur_intersection, x, y, center, mCenterToCam);
                        cur_intersection -= center;
                        mMouseDown = projected_vec(cur_intersection, up_from_axis);
                        F32 mouse_depth = SNAP_GUIDE_INNER_RADIUS * mRadiusMeters;
                        F32 mouse_dist_sqrd = mMouseDown.magVecSquared();
                        if (mouse_dist_sqrd > 0.0001f)
                        {
                                mouse_depth = sqrtf((SNAP_GUIDE_INNER_RADIUS * mRadiusMeters) * (SNAP_GUIDE_INNER_RADIUS * mRadiusMeters) - 
                                                                        mouse_dist_sqrd);
                        }
                        LLVector3 projected_center_to_cam = mCenterToCamNorm - projected_vec(mCenterToCamNorm, axis);
                        mMouseDown += mouse_depth * projected_center_to_cam;

                }
                else
                {
                        mMouseDown = findNearestPointOnRing( x, y, center, axis ) - center;
                        mMouseDown.normVec();
                }
        }

        mMouseCur = mMouseDown;

        // Route future Mouse messages here preemptively.  (Release on mouse up.)
        setMouseCapture( TRUE );
        LLSelectMgr::getInstance()->enableSilhouette(FALSE);
        return TRUE;
}


LLVector3 LLManipRotate::findNearestPointOnRing( S32 x, S32 y, const LLVector3& center, const LLVector3& axis )
{
        // Project the delta onto the ring and rescale it by the radius so that it's _on_ the ring.
        LLVector3 proj_onto_ring;
        getMousePointOnPlaneAgent(proj_onto_ring, x, y, center, axis);
        proj_onto_ring -= center;
        proj_onto_ring.normVec();

        return center + proj_onto_ring * mRadiusMeters;
}

BOOL LLManipRotate::handleMouseUp(S32 x, S32 y, MASK mask)
{
        // first, perform normal processing in case this was a quick-click
        handleHover(x, y, mask);

        if( hasMouseCapture() )
        {
                mManipPart = LL_NO_PART;

                // Might have missed last update due to timing.
                LLSelectMgr::getInstance()->sendMultipleUpdate( UPD_ROTATION | UPD_POSITION );
                LLSelectMgr::getInstance()->enableSilhouette(TRUE);
                //gAgent.setObjectTracking(gSavedSettings.getBOOL("TrackFocusObject"));

                LLSelectMgr::getInstance()->updateSelectionCenter();
                LLSelectMgr::getInstance()->saveSelectedObjectTransform(SELECT_ACTION_TYPE_PICK);
        }

        return LLManip::handleMouseUp(x, y, mask);
}


BOOL LLManipRotate::handleHover(S32 x, S32 y, MASK mask)
{
        if( hasMouseCapture() )
        {
                if( mObjectSelection->isEmpty() )
                {
                        // Somehow the object got deselected while we were dragging it.
                        setMouseCapture( FALSE );
                }
                else
                {
                        drag(x, y);
                }

                lldebugst(LLERR_USER_INPUT) << "hover handled by LLManipRotate (active)" << llendl;             
        }
        else
        {
                highlightManipulators(x, y);
                lldebugst(LLERR_USER_INPUT) << "hover handled by LLManipRotate (inactive)" << llendl;           
        }

        gViewerWindow->setCursor(UI_CURSOR_TOOLROTATE);
        return TRUE;
}


LLVector3 LLManipRotate::projectToSphere( F32 x, F32 y, BOOL* on_sphere ) 
{
        F32 z = 0.f;
        F32 dist_squared = x*x + y*y;

        *on_sphere = dist_squared <= SQ_RADIUS;
    if( *on_sphere )
        {    
        z = sqrt(SQ_RADIUS - dist_squared);
    }
        return LLVector3( x, y, z );
}

// Freeform rotation
void LLManipRotate::drag( S32 x, S32 y )
{
        if( !updateVisiblity() )
        {
                return;
        }

        if( mManipPart == LL_ROT_GENERAL )
        {
                mRotation = dragUnconstrained(x, y);
        }
        else
        {
                mRotation = dragConstrained(x, y);
        }

        BOOL damped = mSmoothRotate;
        mSmoothRotate = FALSE;

        for (LLObjectSelection::iterator iter = mObjectSelection->begin();
                 iter != mObjectSelection->end(); iter++)
        {
                LLSelectNode* selectNode = *iter;
                LLViewerObject* object = selectNode->getObject();

                // have permission to move and object is root of selection or individually selected
                if (object->permMove() && (object->isRootEdit() || selectNode->mIndividualSelection))
                {
                        if (!object->isRootEdit())
                        {
                                // child objects should not update if parent is selected
                                LLViewerObject* editable_root = (LLViewerObject*)object->getParent();
                                if (editable_root->isSelected())
                                {
                                        // we will be moved properly by our parent, so skip
                                        continue;
                                }
                        }

                        LLQuaternion new_rot = selectNode->mSavedRotation * mRotation;
                        std::vector<LLVector3> child_positions;
                        std::vector<LLQuaternion> child_rotations;
                        if (object->isRootEdit() && selectNode->mIndividualSelection)
                        {
                                for (U32 i = 0; i < object->mChildList.size(); i++)
                                {
                                        LLViewerObject* childp = object->mChildList[i];
                                        child_positions.push_back(childp->getPositionEdit());
                                        child_rotations.push_back(childp->getRotationEdit());
                                }
                        }

                        if (object->getParent() && object->mDrawable.notNull())
                        {
                                LLQuaternion invParentRotation = object->mDrawable->mXform.getParent()->getWorldRotation();
                                invParentRotation.transQuat();

                                object->setRotation(new_rot * invParentRotation, damped);
                                rebuild(object);
                        }
                        else
                        {
                                object->setRotation(new_rot, damped);
                                rebuild(object);
                        }

                        // for individually selected roots, we need to counterrotate all the children
                        if (object->isRootEdit() && selectNode->mIndividualSelection)
                        {
                                //RN: must do non-damped updates on these objects so relative rotation appears constant
                                // instead of having two competing slerps making the child objects appear to "wobble"
                                for (U32 i = 0; i < object->mChildList.size(); i++)
                                {
                                        LLViewerObject* childp = object->mChildList[i];
                                        LLVector3 child_offset = ((child_positions[i] - object->getPositionEdit()) * ~object->getRotationEdit()) - childp->getPosition();
                                        if (!childp->isSelected() && childp->mDrawable.notNull())
                                        {
                                                childp->setRotation(child_rotations[i] * ~object->getRotationEdit());
                                                childp->setPosition((child_positions[i] - object->getPositionEdit()) * ~object->getRotationEdit());
                                                rebuild(childp);
                                        }
                                }
                        }
                }
        }

        // update positions
        for (LLObjectSelection::iterator iter = mObjectSelection->begin();
                 iter != mObjectSelection->end(); iter++)
        {
                LLSelectNode* selectNode = *iter;
                LLViewerObject* object = selectNode->getObject();

                // to avoid cumulative position changes we calculate the objects new position using its saved position
                if (object && object->permMove())
                {
                        LLVector3 center   = gAgent.getPosAgentFromGlobal( mRotationCenter );

                        LLVector3 old_position;
                        LLVector3 new_position;

                        if (object->isAttachment() && object->mDrawable.notNull())
                        { 
                                // need to work in drawable space to handle selected items from multiple attachments 
                                // (which have no shared frame of reference other than their render positions)
                                LLXform* parent_xform = object->mDrawable->getXform()->getParent();
                                new_position = (selectNode->mSavedPositionLocal * parent_xform->getWorldRotation()) + parent_xform->getWorldPosition();
                                old_position = (object->getPosition() * parent_xform->getWorldRotation()) + parent_xform->getWorldPosition();//object->getRenderPosition();
                        }
                        else
                        {
                                new_position = gAgent.getPosAgentFromGlobal( selectNode->mSavedPositionGlobal );
                                old_position = object->getPositionAgent();
                        }

                        new_position = (new_position - center) * mRotation;             // new relative rotated position
                        new_position += center;
                        
                        if (object->isRootEdit() && !object->isAttachment())
                        {
                                LLVector3d new_pos_global = gAgent.getPosGlobalFromAgent(new_position);
                                new_pos_global = LLWorld::getInstance()->clipToVisibleRegions(selectNode->mSavedPositionGlobal, new_pos_global);
                                new_position = gAgent.getPosAgentFromGlobal(new_pos_global);
                        }

                        // for individually selected child objects
                        if (!object->isRootEdit() && selectNode->mIndividualSelection)
                        {
                                LLViewerObject* parentp = (LLViewerObject*)object->getParent();
                                if (!parentp->isSelected())
                                {
                                        if (object->isAttachment() && object->mDrawable.notNull())
                                        {
                                                // find position relative to render position of parent
                                                object->setPosition((new_position - parentp->getRenderPosition()) * ~parentp->getRenderRotation());
                                                rebuild(object);
                                        }
                                        else
                                        {
                                                object->setPositionParent((new_position - parentp->getPositionAgent()) * ~parentp->getRotationRegion());
                                                rebuild(object);
                                        }
                                }
                        }
                        else if (object->isRootEdit())
                        {
                                if (object->isAttachment() && object->mDrawable.notNull())
                                {
                                        LLXform* parent_xform = object->mDrawable->getXform()->getParent();
                                        object->setPosition((new_position - parent_xform->getWorldPosition()) * ~parent_xform->getWorldRotation());
                                        rebuild(object);
                                }
                                else
                                {
                                        object->setPositionAgent(new_position);
                                        rebuild(object);
                                }
                        }

                        // for individually selected roots, we need to counter-translate all unselected children
                        if (object->isRootEdit() && selectNode->mIndividualSelection)
                        {
                                // only offset by parent's translation as we've already countered parent's rotation
                                LLVector3 child_offset;
                                if (object->isAttachment() && object->mDrawable.notNull())
                                {
                                        LLXform* attachment_point_xform = object->mDrawable->getXform()->getParent();
                                        LLQuaternion parent_rotation = object->getRotation() * attachment_point_xform->getWorldRotation();
                                        child_offset = LLVector3(old_position - new_position) * ~parent_rotation;
                                }
                                else
                                {
                                        child_offset = LLVector3(old_position - new_position) * ~object->getRenderRotation();
                                }

                                rebuild(object);
                                for (U32 i = 0; i < object->mChildList.size(); i++)
                                {
                                        LLViewerObject* childp = object->mChildList[i];
                                        if (!childp->isSelected() && childp->mDrawable.notNull())
                                        {
                                                childp->setPosition(childp->getPosition() + child_offset);
                                                rebuild(childp);
                                        }
                                }
                        }
                }
        }

        // store changes to override updates
        for (LLObjectSelection::iterator iter = LLSelectMgr::getInstance()->getSelection()->begin();
                 iter != LLSelectMgr::getInstance()->getSelection()->end(); iter++)
        {
                LLSelectNode* selectNode = *iter;
                LLViewerObject*cur = selectNode->getObject();
                if( cur->permModify() && cur->permMove() && !cur->isAvatar())
                {
                        selectNode->mLastRotation = cur->getRotation();
                        selectNode->mLastPositionLocal = cur->getPosition();
                }
        }       

        LLSelectMgr::getInstance()->updateSelectionCenter();

        // RN: just clear focus so camera doesn't follow spurious object updates
        gAgent.clearFocusObject();
        dialog_refresh_all();
}

void LLManipRotate::renderActiveRing( F32 radius, F32 width, const LLColor4& front_color, const LLColor4& back_color)
{
        LLGLEnable cull_face(GL_CULL_FACE);
        {
                gl_ring(radius, width, back_color, back_color * 0.5f, CIRCLE_STEPS, FALSE);
                gl_ring(radius, width, back_color, back_color * 0.5f, CIRCLE_STEPS, TRUE);
        }
        {
                LLGLDepthTest gls_depth(GL_FALSE);
                gl_ring(radius, width, front_color, front_color * 0.5f, CIRCLE_STEPS, FALSE);
                gl_ring(radius, width, front_color, front_color * 0.5f, CIRCLE_STEPS, TRUE);
        }
}

void LLManipRotate::renderSnapGuides()
{
        LLVector3 grid_origin;
        LLVector3 grid_scale;
        LLQuaternion grid_rotation;
        LLVector3 constraint_axis = getConstraintAxis();

        LLSelectMgr::getInstance()->getGrid(grid_origin, grid_rotation, grid_scale);

        if (!gSavedSettings.getBOOL("SnapEnabled"))
        {
                return;
        }

        LLVector3 center = gAgent.getPosAgentFromGlobal( mRotationCenter );
        LLVector3 cam_at_axis;
        if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
        {
                cam_at_axis.setVec(1.f, 0.f, 0.f);
        }
        else
        {
                cam_at_axis = center - gAgent.getCameraPositionAgent();
                cam_at_axis.normVec();
        }

        LLVector3 world_snap_axis;
        LLVector3 test_axis = constraint_axis;

        BOOL constrain_to_ref_object = FALSE;
        if (mObjectSelection->getSelectType() == SELECT_TYPE_ATTACHMENT && gAgent.getAvatarObject())
        {
                test_axis = test_axis * ~grid_rotation;
        }
        else if (LLSelectMgr::getInstance()->getGridMode() == GRID_MODE_REF_OBJECT)
        {
                test_axis = test_axis * ~grid_rotation;
                constrain_to_ref_object = TRUE;
        }

        test_axis.abs();

        // find closest global/reference axis to local constraint axis;
        if (test_axis.mV[VX] > test_axis.mV[VY] && test_axis.mV[VX] > test_axis.mV[VZ])
        {
                world_snap_axis = LLVector3::y_axis;
        }
        else if (test_axis.mV[VY] > test_axis.mV[VZ])
        {
                world_snap_axis = LLVector3::z_axis;
        }
        else
        {
                world_snap_axis = LLVector3::x_axis;
        }

        LLVector3 projected_snap_axis = world_snap_axis;
        if (mObjectSelection->getSelectType() == SELECT_TYPE_ATTACHMENT && gAgent.getAvatarObject())
        {
                projected_snap_axis = projected_snap_axis * grid_rotation;
        }
        else if (constrain_to_ref_object)
        {
                projected_snap_axis = projected_snap_axis * grid_rotation;
        }

        // project world snap axis onto constraint plane
        projected_snap_axis -= projected_vec(projected_snap_axis, constraint_axis);
        projected_snap_axis.normVec();

        S32 num_rings = mCamEdgeOn ? 2 : 1;
        for (S32 ring_num = 0; ring_num < num_rings; ring_num++)
        {
                LLVector3 center = gAgent.getPosAgentFromGlobal( mRotationCenter );

                if (mCamEdgeOn)
                {
                        // draw two opposing rings
                        if (ring_num == 0)
                        {
                                center += constraint_axis * mRadiusMeters * 0.5f;
                        }
                        else
                        {
                                center -= constraint_axis * mRadiusMeters * 0.5f;
                        }
                }

                LLGLDepthTest gls_depth(GL_FALSE);
                for (S32 pass = 0; pass < 3; pass++)
                {
                        // render snap guide ring
                        glPushMatrix();
                        
                        LLQuaternion snap_guide_rot;
                        F32 angle_radians, x, y, z;
                        snap_guide_rot.shortestArc(LLVector3::z_axis, getConstraintAxis());
                        snap_guide_rot.getAngleAxis(&angle_radians, &x, &y, &z);
                        glTranslatef(center.mV[VX], center.mV[VY], center.mV[VZ]);
                        glRotatef(angle_radians * RAD_TO_DEG, x, y, z);

                        LLColor4 line_color = setupSnapGuideRenderPass(pass);

                        gGL.color4fv(line_color.mV);

                        if (mCamEdgeOn)
                        {
                                // render an arc
                                LLVector3 edge_normal = cam_at_axis % constraint_axis;
                                edge_normal.normVec();
                                LLVector3 x_axis_snap = LLVector3::x_axis * snap_guide_rot;
                                LLVector3 y_axis_snap = LLVector3::y_axis * snap_guide_rot;

                                F32 end_angle = atan2(y_axis_snap * edge_normal, x_axis_snap * edge_normal);
                                //F32 start_angle = angle_between((-1.f * LLVector3::x_axis) * snap_guide_rot, edge_normal);
                                F32 start_angle = end_angle - F_PI;
                                gl_arc_2d(0.f, 0.f, mRadiusMeters * SNAP_GUIDE_INNER_RADIUS, CIRCLE_STEPS, FALSE, start_angle, end_angle);
                        }
                        else
                        {
                                gl_circle_2d(0.f, 0.f, mRadiusMeters * SNAP_GUIDE_INNER_RADIUS, CIRCLE_STEPS, FALSE);
                        }
                        glPopMatrix();

                        for (S32 i = 0; i < 64; i++)
                        {
                                BOOL render_text = TRUE;
                                F32 deg = 5.625f * (F32)i;
                                LLVector3 inner_point;
                                LLVector3 outer_point;
                                LLVector3 text_point;
                                LLQuaternion rot(deg * DEG_TO_RAD, constraint_axis);
                                gGL.begin(LLVertexBuffer::LINES);
                                {
                                        inner_point = (projected_snap_axis * mRadiusMeters * SNAP_GUIDE_INNER_RADIUS * rot) + center;
                                        F32 tick_length = 0.f;
                                        if (i % 16 == 0)
                                        {
                                                tick_length = mRadiusMeters * (SNAP_GUIDE_RADIUS_1 - SNAP_GUIDE_INNER_RADIUS);
                                        }
                                        else if (i % 8 == 0)
                                        {
                                                tick_length = mRadiusMeters * (SNAP_GUIDE_RADIUS_2 - SNAP_GUIDE_INNER_RADIUS);
                                        }
                                        else if (i % 4 == 0)
                                        {
                                                tick_length = mRadiusMeters * (SNAP_GUIDE_RADIUS_3 - SNAP_GUIDE_INNER_RADIUS);
                                        }
                                        else if (i % 2 == 0)
                                        {
                                                tick_length = mRadiusMeters * (SNAP_GUIDE_RADIUS_4 - SNAP_GUIDE_INNER_RADIUS);
                                        }
                                        else
                                        {
                                                tick_length = mRadiusMeters * (SNAP_GUIDE_RADIUS_5 - SNAP_GUIDE_INNER_RADIUS);
                                        }
                                        
                                        if (mCamEdgeOn)
                                        {
                                                // don't draw ticks that are on back side of circle
                                                F32 dot = cam_at_axis * (projected_snap_axis * rot);
                                                if (dot > 0.f)
                                                {
                                                        outer_point = inner_point;
                                                        render_text = FALSE;
                                                }
                                                else
                                                {
                                                        if (ring_num == 0)
                                                        {
                                                                outer_point = inner_point + (constraint_axis * tick_length) * rot;
                                                        }
                                                        else
                                                        {
                                                                outer_point = inner_point - (constraint_axis * tick_length) * rot;
                                                        }
                                                }
                                        }
                                        else
                                        {
                                                outer_point = inner_point + (projected_snap_axis * tick_length) * rot;
                                        }

                                        text_point = outer_point + (projected_snap_axis * mRadiusMeters * 0.1f) * rot;

                                        gGL.vertex3fv(inner_point.mV);
                                        gGL.vertex3fv(outer_point.mV);
                                }
                                gGL.end();

                                //RN: text rendering does own shadow pass, so only render once
                                if (pass == 1 && render_text && i % 16 == 0)
                                {
                                        if (world_snap_axis.mV[VX])
                                        {
                                                if (i == 0)
                                                {
                                                        renderTickText(text_point, mObjectSelection->isAttachment() ? "Forward" : "East", LLColor4::white);
                                                }
                                                else if (i == 16)
                                                {
                                                        if (constraint_axis.mV[VZ] > 0.f)
                                                        {
                                                                renderTickText(text_point, mObjectSelection->isAttachment() ? "Left" : "North", LLColor4::white);
                                                        }
                                                        else
                                                        {
                                                                renderTickText(text_point, mObjectSelection->isAttachment() ? "Right" : "South", LLColor4::white);
                                                        }
                                                }
                                                else if (i == 32)
                                                {
                                                        renderTickText(text_point, mObjectSelection->isAttachment() ? "Back" : "West", LLColor4::white);
                                                }
                                                else
                                                {
                                                        if (constraint_axis.mV[VZ] > 0.f)
                                                        {
                                                                renderTickText(text_point, mObjectSelection->isAttachment() ? "Right" : "South", LLColor4::white);
                                                        }
                                                        else
                                                        {
                                                                renderTickText(text_point, mObjectSelection->isAttachment() ? "Left" : "North", LLColor4::white);
                                                        }
                                                }
                                        }
                                        else if (world_snap_axis.mV[VY])
                                        {
                                                if (i == 0)
                                                {
                                                        renderTickText(text_point, mObjectSelection->isAttachment() ? "Left" : "North", LLColor4::white);
                                                }
                                                else if (i == 16)
                                                {
                                                        if (constraint_axis.mV[VX] > 0.f)
                                                        {
                                                                renderTickText(text_point, "Up", LLColor4::white);
                                                        }
                                                        else
                                                        {
                                                                renderTickText(text_point, "Down", LLColor4::white);
                                                        }
                                                }
                                                else if (i == 32)
                                                {
                                                        renderTickText(text_point, mObjectSelection->isAttachment() ? "Right" : "South", LLColor4::white);
                                                }
                                                else
                                                {
                                                        if (constraint_axis.mV[VX] > 0.f)
                                                        {
                                                                renderTickText(text_point, "Down", LLColor4::white);
                                                        }
                                                        else
                                                        {
                                                                renderTickText(text_point, "Up", LLColor4::white);
                                                        }
                                                }
                                        }
                                        else if (world_snap_axis.mV[VZ])
                                        {
                                                if (i == 0)
                                                {
                                                        renderTickText(text_point, "Up", LLColor4::white);
                                                }
                                                else if (i == 16)
                                                {
                                                        if (constraint_axis.mV[VY] > 0.f)
                                                        {
                                                                renderTickText(text_point, mObjectSelection->isAttachment() ? "Forward" : "East", LLColor4::white);
                                                        }
                                                        else
                                                        {
                                                                renderTickText(text_point, mObjectSelection->isAttachment() ? "Back" : "West", LLColor4::white);
                                                        }
                                                }
                                                else if (i == 32)
                                                {
                                                        renderTickText(text_point, "Down", LLColor4::white);
                                                }
                                                else
                                                {
                                                        if (constraint_axis.mV[VY] > 0.f)
                                                        {
                                                                renderTickText(text_point, mObjectSelection->isAttachment() ? "Back" : "West", LLColor4::white);
                                                        }
                                                        else
                                                        {
                                                                renderTickText(text_point, mObjectSelection->isAttachment() ? "Forward" : "East", LLColor4::white);
                                                        }
                                                }
                                        }
                                }
                                gGL.color4fv(line_color.mV);
                        }

                        // now render projected object axis
                        if (mInSnapRegime)
                        {
                                LLVector3 object_axis;
                                getObjectAxisClosestToMouse(object_axis);

                                // project onto constraint plane
                                LLSelectNode* first_node = mObjectSelection->getFirstMoveableNode(TRUE);
                                object_axis = object_axis * first_node->getObject()->getRenderRotation();
                                object_axis = object_axis - (object_axis * getConstraintAxis()) * getConstraintAxis();
                                object_axis.normVec();
                                object_axis = object_axis * SNAP_GUIDE_INNER_RADIUS * mRadiusMeters + center;
                                LLVector3 line_start = center;

                                gGL.begin(LLVertexBuffer::LINES);
                                {
                                        gGL.vertex3fv(line_start.mV);
                                        gGL.vertex3fv(object_axis.mV);
                                }
                                gGL.end();

                                // draw snap guide arrow
                                gGL.begin(LLVertexBuffer::TRIANGLES);
                                {
                                        LLVector3 arrow_dir;
                                        LLVector3 arrow_span = (object_axis - line_start) % getConstraintAxis();
                                        arrow_span.normVec();

                                        arrow_dir = mCamEdgeOn ? getConstraintAxis() : object_axis - line_start;
                                        arrow_dir.normVec();
                                        if (ring_num == 1)
                                        {
                                                arrow_dir *= -1.f;
                                        }
                                        gGL.vertex3fv((object_axis + arrow_dir * mRadiusMeters * 0.1f).mV);
                                        gGL.vertex3fv((object_axis + arrow_span * mRadiusMeters * 0.1f).mV);
                                        gGL.vertex3fv((object_axis - arrow_span * mRadiusMeters * 0.1f).mV);
                                }
                                gGL.end();

                                {
                                        LLGLDepthTest gls_depth(GL_TRUE);
                                        gGL.begin(LLVertexBuffer::LINES);
                                        {
                                                gGL.vertex3fv(line_start.mV);
                                                gGL.vertex3fv(object_axis.mV);
                                        }
                                        gGL.end();

                                        // draw snap guide arrow
                                        gGL.begin(LLVertexBuffer::TRIANGLES);
                                        {
                                                LLVector3 arrow_dir;
                                                LLVector3 arrow_span = (object_axis - line_start) % getConstraintAxis();
                                                arrow_span.normVec();

                                                arrow_dir = mCamEdgeOn ? getConstraintAxis() : object_axis - line_start;
                                                arrow_dir.normVec();
                                                if (ring_num == 1)
                                                {
                                                        arrow_dir *= -1.f;
                                                }

                                                gGL.vertex3fv((object_axis + arrow_dir * mRadiusMeters * 0.1f).mV);
                                                gGL.vertex3fv((object_axis + arrow_span * mRadiusMeters * 0.1f).mV);
                                                gGL.vertex3fv((object_axis - arrow_span * mRadiusMeters * 0.1f).mV);
                                        }
                                        gGL.end();
                                }
                        }
                }
        }
}

// Returns TRUE if center of sphere is visible.  Also sets a bunch of member variables that are used later (e.g. mCenterToCam)
BOOL LLManipRotate::updateVisiblity()
{
        // Don't want to recalculate the center of the selection during a drag.
        // Due to packet delays, sometimes half the objects in the selection have their
        // new position and half have their old one.  This creates subtle errors in the
        // computed center position for that frame.  Unfortunately, these errors
        // accumulate.  The result is objects seem to "fly apart" during rotations.
        // JC - 03.26.2002
        if (!hasMouseCapture())
        {
                mRotationCenter = gAgent.getPosGlobalFromAgent( getPivotPoint() );//LLSelectMgr::getInstance()->getSelectionCenterGlobal();
        }

        BOOL visible = FALSE;

        LLVector3 center = gAgent.getPosAgentFromGlobal( mRotationCenter );
        if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
        {
                mCenterToCam = LLVector3(-1.f / gAgent.getAvatarObject()->mHUDCurZoom, 0.f, 0.f);
                mCenterToCamNorm = mCenterToCam;
                mCenterToCamMag = mCenterToCamNorm.normVec();

                mRadiusMeters = RADIUS_PIXELS / (F32) LLViewerCamera::getInstance()->getViewHeightInPixels();
                mRadiusMeters /= gAgent.getAvatarObject()->mHUDCurZoom;

                mCenterToProfilePlaneMag = mRadiusMeters * mRadiusMeters / mCenterToCamMag;
                mCenterToProfilePlane = -mCenterToProfilePlaneMag * mCenterToCamNorm;

                mCenterScreen.set((S32)((0.5f - mRotationCenter.mdV[VY]) / gAgent.getAvatarObject()->mHUDCurZoom * gViewerWindow->getWindowWidth()),
                                                        (S32)((mRotationCenter.mdV[VZ] + 0.5f) / gAgent.getAvatarObject()->mHUDCurZoom * gViewerWindow->getWindowHeight()));
                visible = TRUE;
        }
        else
        {
                visible = LLViewerCamera::getInstance()->projectPosAgentToScreen(center, mCenterScreen );
                if( visible )
                {
                        mCenterToCam = gAgent.getCameraPositionAgent() - center;
                        mCenterToCamNorm = mCenterToCam;
                        mCenterToCamMag = mCenterToCamNorm.normVec();
                        LLVector3 cameraAtAxis = LLViewerCamera::getInstance()->getAtAxis();
                        cameraAtAxis.normVec();

                        F32 z_dist = -1.f * (mCenterToCam * cameraAtAxis);

                        // Don't drag manip if object too far away
                        if (gSavedSettings.getBOOL("LimitSelectDistance"))
                        {
                                F32 max_select_distance = gSavedSettings.getF32("MaxSelectDistance");
                                if (dist_vec(gAgent.getPositionAgent(), center) > max_select_distance)
                                {
                                        visible = FALSE;
                                }
                        }
                        
                        if (mCenterToCamMag > 0.001f)
                        {
                                F32 fraction_of_fov = RADIUS_PIXELS / (F32) LLViewerCamera::getInstance()->getViewHeightInPixels();
                                F32 apparent_angle = fraction_of_fov * LLViewerCamera::getInstance()->getView();  // radians
                                mRadiusMeters = z_dist * tan(apparent_angle);

                                mCenterToProfilePlaneMag = mRadiusMeters * mRadiusMeters / mCenterToCamMag;
                                mCenterToProfilePlane = -mCenterToProfilePlaneMag * mCenterToCamNorm;
                        }
                        else
                        {
                                visible = FALSE;
                        }
                }
        }

        mCamEdgeOn = FALSE;
        F32 axis_onto_cam = mManipPart >= LL_ROT_X ? llabs( getConstraintAxis() * mCenterToCamNorm ) : 0.f;
        if( axis_onto_cam < AXIS_ONTO_CAM_TOLERANCE )
        {
                mCamEdgeOn = TRUE;
        }

        return visible;
}

LLQuaternion LLManipRotate::dragUnconstrained( S32 x, S32 y )
{
        LLVector3 cam = gAgent.getCameraPositionAgent();
        LLVector3 center =  gAgent.getPosAgentFromGlobal( mRotationCenter );

        mMouseCur = intersectMouseWithSphere( x, y, center, mRadiusMeters);

        F32 delta_x = (F32)(mCenterScreen.mX - x);
        F32 delta_y = (F32)(mCenterScreen.mY - y);

        F32 dist_from_sphere_center = sqrt(delta_x * delta_x + delta_y * delta_y);

        LLVector3 axis = mMouseDown % mMouseCur;
        axis.normVec();
        F32 angle = acos(mMouseDown * mMouseCur);
        LLQuaternion sphere_rot( angle, axis );

        if (is_approx_zero(1.f - mMouseDown * mMouseCur))
        {
                return LLQuaternion::DEFAULT;
        }
        else if (dist_from_sphere_center < RADIUS_PIXELS)
        {
                return sphere_rot;
        }
        else
        {
                LLVector3 intersection;
                getMousePointOnPlaneAgent( intersection, x, y, center + mCenterToProfilePlane, mCenterToCamNorm );

                // amount dragging in sphere from center to periphery would rotate object
                F32 in_sphere_angle = F_PI_BY_TWO;
                F32 dist_to_tangent_point = mRadiusMeters;
                if( !is_approx_zero( mCenterToProfilePlaneMag ) )
                {
                        dist_to_tangent_point = sqrt( mRadiusMeters * mRadiusMeters - mCenterToProfilePlaneMag * mCenterToProfilePlaneMag );
                        in_sphere_angle = atan2( dist_to_tangent_point, mCenterToProfilePlaneMag );
                }

                LLVector3 profile_center_to_intersection = intersection - (center + mCenterToProfilePlane);
                F32 dist_to_intersection = profile_center_to_intersection.normVec();
                F32 angle = (-1.f + dist_to_intersection / dist_to_tangent_point) * in_sphere_angle;

                LLVector3 axis;
                if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
                {
                        axis = LLVector3(-1.f, 0.f, 0.f) % profile_center_to_intersection;
                }
                else
                {
                        axis = (cam - center) % profile_center_to_intersection;
                        axis.normVec();
                }
                return sphere_rot * LLQuaternion( angle, axis );
        }
}

LLVector3 LLManipRotate::getConstraintAxis()
{
        LLVector3 axis;
        if( LL_ROT_ROLL == mManipPart )
        {
                axis = mCenterToCamNorm;
        }
        else
        {
                S32 axis_dir = mManipPart - LL_ROT_X;
                if ((axis_dir >= 0) && (axis_dir < 3))
                {
                        axis.mV[axis_dir] = 1.f;
                }
                else
                {
#ifndef LL_RELEASE_FOR_DOWNLOAD
                        llerrs << "Got bogus hit part in LLManipRotate::getConstraintAxis():" << mManipPart << llendl
#else
                        llwarns << "Got bogus hit part in LLManipRotate::getConstraintAxis():" << mManipPart << llendl
#endif
                        axis.mV[0] = 1.f;
                }

                LLVector3 grid_origin;
                LLVector3 grid_scale;
                LLQuaternion grid_rotation;

                LLSelectMgr::getInstance()->getGrid(grid_origin, grid_rotation, grid_scale);

                LLSelectNode* first_node = mObjectSelection->getFirstMoveableNode(TRUE);
                if (first_node)
                {
                        // *FIX: get agent local attachment grid working
                        // Put rotation into frame of first selected root object
                        axis = axis * grid_rotation;
                }
        }

        return axis;
}

LLQuaternion LLManipRotate::dragConstrained( S32 x, S32 y )
{
        LLSelectNode* first_object_node = mObjectSelection->getFirstMoveableNode(TRUE);
        LLVector3 constraint_axis = getConstraintAxis();
        LLVector3 center = gAgent.getPosAgentFromGlobal( mRotationCenter );

        F32 angle = 0.f;

        // build snap axes
        LLVector3 grid_origin;
        LLVector3 grid_scale;
        LLQuaternion grid_rotation;

        LLSelectMgr::getInstance()->getGrid(grid_origin, grid_rotation, grid_scale);

        LLVector3 axis1;
        LLVector3 axis2;

        LLVector3 test_axis = constraint_axis;
        if (mObjectSelection->getSelectType() == SELECT_TYPE_ATTACHMENT && gAgent.getAvatarObject())
        {
                test_axis = test_axis * ~grid_rotation;
        }
        else if (LLSelectMgr::getInstance()->getGridMode() == GRID_MODE_REF_OBJECT)
        {
                test_axis = test_axis * ~grid_rotation;
        }
        test_axis.abs();

        // find closest global axis to constraint axis;
        if (test_axis.mV[VX] > test_axis.mV[VY] && test_axis.mV[VX] > test_axis.mV[VZ])
        {
                axis1 = LLVector3::y_axis;
        }
        else if (test_axis.mV[VY] > test_axis.mV[VZ])
        {
                axis1 = LLVector3::z_axis;
        }
        else
        {
                axis1 = LLVector3::x_axis;
        }

        if (mObjectSelection->getSelectType() == SELECT_TYPE_ATTACHMENT && gAgent.getAvatarObject())
        {
                axis1 = axis1 * grid_rotation;
        }
        else if (LLSelectMgr::getInstance()->getGridMode() == GRID_MODE_REF_OBJECT)
        {
                axis1 = axis1 * grid_rotation;
        }

        //project axis onto constraint plane
        axis1 -= (axis1 * constraint_axis) * constraint_axis;
        axis1.normVec();

        // calculate third and final axis
        axis2 = constraint_axis % axis1;

        //F32 axis_onto_cam = llabs( constraint_axis * mCenterToCamNorm );
        if( mCamEdgeOn )
        {
                // We're looking at the ring edge-on.
                LLVector3 snap_plane_center = (center + (constraint_axis * mRadiusMeters * 0.5f));
                LLVector3 cam_to_snap_plane;
                if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
                {
                        cam_to_snap_plane.setVec(1.f, 0.f, 0.f);
                }
                else
                {
                        cam_to_snap_plane = snap_plane_center - gAgent.getCameraPositionAgent();
                        cam_to_snap_plane.normVec();
                }

                LLVector3 projected_mouse;
                BOOL hit = getMousePointOnPlaneAgent(projected_mouse, x, y, snap_plane_center, constraint_axis);
                projected_mouse -= snap_plane_center;

                S32 snap_plane = 0;

                F32 dot = cam_to_snap_plane * constraint_axis;
                if (llabs(dot) < 0.01f)
                {
                        // looking at ring edge on, project onto view plane and check if mouse is past ring
                        getMousePointOnPlaneAgent(projected_mouse, x, y, snap_plane_center, cam_to_snap_plane);
                        projected_mouse -= snap_plane_center;
                        dot = projected_mouse * constraint_axis;
                        if (projected_mouse * constraint_axis > 0)
                        {
                                snap_plane = 1;
                        }
                        projected_mouse -= dot * constraint_axis;
                }
                else if (dot > 0.f)
                {
                        // look for mouse position outside and in front of snap circle
                        if (hit && projected_mouse.magVec() > SNAP_GUIDE_INNER_RADIUS * mRadiusMeters && projected_mouse * cam_to_snap_plane < 0.f)
                        {
                                snap_plane = 1;
                        }
                }
                else
                {
                        // look for mouse position inside or in back of snap circle
                        if (projected_mouse.magVec() < SNAP_GUIDE_INNER_RADIUS * mRadiusMeters || projected_mouse * cam_to_snap_plane > 0.f || !hit)
                        {
                                snap_plane = 1;
                        }
                }

                if (snap_plane == 0)
                {
                        // try other plane
                        snap_plane_center = (center - (constraint_axis * mRadiusMeters * 0.5f));
                        if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
                        {
                                cam_to_snap_plane.setVec(1.f, 0.f, 0.f);
                        }
                        else
                        {
                                cam_to_snap_plane = snap_plane_center - gAgent.getCameraPositionAgent();
                                cam_to_snap_plane.normVec();
                        }

                        hit = getMousePointOnPlaneAgent(projected_mouse, x, y, snap_plane_center, constraint_axis);
                        projected_mouse -= snap_plane_center;

                        dot = cam_to_snap_plane * constraint_axis;
                        if (llabs(dot) < 0.01f)
                        {
                                // looking at ring edge on, project onto view plane and check if mouse is past ring
                                getMousePointOnPlaneAgent(projected_mouse, x, y, snap_plane_center, cam_to_snap_plane);
                                projected_mouse -= snap_plane_center;
                                dot = projected_mouse * constraint_axis;
                                if (projected_mouse * constraint_axis < 0)
                                {
                                        snap_plane = 2;
                                }
                                projected_mouse -= dot * constraint_axis;
                        }
                        else if (dot < 0.f)
                        {
                                // look for mouse position outside and in front of snap circle
                                if (hit && projected_mouse.magVec() > SNAP_GUIDE_INNER_RADIUS * mRadiusMeters && projected_mouse * cam_to_snap_plane < 0.f)
                                {
                                        snap_plane = 2;
                                }
                        }
                        else
                        {
                                // look for mouse position inside or in back of snap circle
                                if (projected_mouse.magVec() < SNAP_GUIDE_INNER_RADIUS * mRadiusMeters || projected_mouse * cam_to_snap_plane > 0.f || !hit)
                                {
                                        snap_plane = 2;
                                }
                        }
                }

                if (snap_plane > 0)
                {
                        LLVector3 cam_at_axis;
                        if (mObjectSelection->getSelectType() == SELECT_TYPE_HUD)
                        {
                                cam_at_axis.setVec(1.f, 0.f, 0.f);
                        }
                        else
                        {
                                cam_at_axis = snap_plane_center - gAgent.getCameraPositionAgent();
                                cam_at_axis.normVec();
                        }

                        // first, project mouse onto screen plane at point tangent to rotation radius. 
                        getMousePointOnPlaneAgent(projected_mouse, x, y, snap_plane_center, cam_at_axis);
                        // project that point onto rotation plane
                        projected_mouse -= snap_plane_center;
                        projected_mouse -= projected_vec(projected_mouse, constraint_axis);

                        F32 mouse_lateral_dist = llmin(SNAP_GUIDE_INNER_RADIUS * mRadiusMeters, projected_mouse.magVec());
                        F32 mouse_depth = SNAP_GUIDE_INNER_RADIUS * mRadiusMeters;
                        if (llabs(mouse_lateral_dist) > 0.01f)
                        {
                                mouse_depth = sqrtf((SNAP_GUIDE_INNER_RADIUS * mRadiusMeters) * (SNAP_GUIDE_INNER_RADIUS * mRadiusMeters) - 
                                                                        (mouse_lateral_dist * mouse_lateral_dist));
                        }
                        LLVector3 projected_camera_at = cam_at_axis - projected_vec(cam_at_axis, constraint_axis);
                        projected_mouse -= mouse_depth * projected_camera_at;

                        if (!mInSnapRegime)
                        {
                                mSmoothRotate = TRUE;
                        }
                        mInSnapRegime = TRUE;
                        // 0 to 360 deg
                        F32 mouse_angle = fmodf(atan2(projected_mouse * axis1, projected_mouse * axis2) * RAD_TO_DEG + 360.f, 360.f);
                        
                        F32 relative_mouse_angle = fmodf(mouse_angle + (SNAP_ANGLE_DETENTE / 2), SNAP_ANGLE_INCREMENT);
                        //fmodf(llround(mouse_angle * RAD_TO_DEG, 7.5f) + 360.f, 360.f);

                        LLVector3 object_axis;
                        getObjectAxisClosestToMouse(object_axis);
                        object_axis = object_axis * first_object_node->mSavedRotation;

                        // project onto constraint plane
                        object_axis = object_axis - (object_axis * getConstraintAxis()) * getConstraintAxis();
                        object_axis.normVec();

                        if (relative_mouse_angle < SNAP_ANGLE_DETENTE)
                        {
                                F32 quantized_mouse_angle = mouse_angle - (relative_mouse_angle - (SNAP_ANGLE_DETENTE * 0.5f));
                                angle = (quantized_mouse_angle * DEG_TO_RAD) - atan2(object_axis * axis1, object_axis * axis2);
                        }
                        else
                        {
                                angle = (mouse_angle * DEG_TO_RAD) - atan2(object_axis * axis1, object_axis * axis2);
                        }
                        return LLQuaternion( -angle, constraint_axis );
                }
                else
                {
                        if (mInSnapRegime)
                        {
                                mSmoothRotate = TRUE;
                        }
                        mInSnapRegime = FALSE;

                        LLVector3 up_from_axis = mCenterToCamNorm % constraint_axis;
                        up_from_axis.normVec();
                        LLVector3 cur_intersection;
                        getMousePointOnPlaneAgent(cur_intersection, x, y, center, mCenterToCam);
                        cur_intersection -= center;
                        mMouseCur = projected_vec(cur_intersection, up_from_axis);
                        F32 mouse_depth = SNAP_GUIDE_INNER_RADIUS * mRadiusMeters;
                        F32 mouse_dist_sqrd = mMouseCur.magVecSquared();
                        if (mouse_dist_sqrd > 0.0001f)
                        {
                                mouse_depth = sqrtf((SNAP_GUIDE_INNER_RADIUS * mRadiusMeters) * (SNAP_GUIDE_INNER_RADIUS * mRadiusMeters) - 
                                                                        mouse_dist_sqrd);
                        }
                        LLVector3 projected_center_to_cam = mCenterToCamNorm - projected_vec(mCenterToCamNorm, constraint_axis);
                        mMouseCur += mouse_depth * projected_center_to_cam;

                        F32 dist = (cur_intersection * up_from_axis) - (mMouseDown * up_from_axis);
                        angle = dist / (SNAP_GUIDE_INNER_RADIUS * mRadiusMeters) * -F_PI_BY_TWO;
                }
        }
        else
        {
                LLVector3 projected_mouse;
                getMousePointOnPlaneAgent(projected_mouse, x, y, center, constraint_axis);
                projected_mouse -= center;
                mMouseCur = projected_mouse;
                mMouseCur.normVec();

                if (!first_object_node)
                {
                        return LLQuaternion::DEFAULT;
                }

                if (gSavedSettings.getBOOL("SnapEnabled") && projected_mouse.magVec() > SNAP_GUIDE_INNER_RADIUS * mRadiusMeters)
                {
                        if (!mInSnapRegime)
                        {
                                mSmoothRotate = TRUE;
                        }
                        mInSnapRegime = TRUE;
                        // 0 to 360 deg
                        F32 mouse_angle = fmodf(atan2(projected_mouse * axis1, projected_mouse * axis2) * RAD_TO_DEG + 360.f, 360.f);
                        
                        F32 relative_mouse_angle = fmodf(mouse_angle + (SNAP_ANGLE_DETENTE / 2), SNAP_ANGLE_INCREMENT);
                        //fmodf(llround(mouse_angle * RAD_TO_DEG, 7.5f) + 360.f, 360.f);

                        LLVector3 object_axis;
                        getObjectAxisClosestToMouse(object_axis);
                        object_axis = object_axis * first_object_node->mSavedRotation;

                        // project onto constraint plane
                        object_axis = object_axis - (object_axis * getConstraintAxis()) * getConstraintAxis();
                        object_axis.normVec();

                        if (relative_mouse_angle < SNAP_ANGLE_DETENTE)
                        {
                                F32 quantized_mouse_angle = mouse_angle - (relative_mouse_angle - (SNAP_ANGLE_DETENTE * 0.5f));
                                angle = (quantized_mouse_angle * DEG_TO_RAD) - atan2(object_axis * axis1, object_axis * axis2);
                        }
                        else
                        {
                                angle = (mouse_angle * DEG_TO_RAD) - atan2(object_axis * axis1, object_axis * axis2);
                        }
                        return LLQuaternion( -angle, constraint_axis );
                }
                else
                {
                        if (mInSnapRegime)
                        {
                                mSmoothRotate = TRUE;
                        }
                        mInSnapRegime = FALSE;
                }

                angle = acos(mMouseCur * mMouseDown);

                F32 dir = (mMouseDown % mMouseCur) * constraint_axis;  // cross product
                if( dir < 0.f )
                {
                        angle *= -1.f;
                }
        }

        F32 rot_step = gSavedSettings.getF32("RotationStep");
        F32 step_size = DEG_TO_RAD * rot_step;
        angle -= fmod(angle, step_size);
                
        return LLQuaternion( angle, constraint_axis );
}



LLVector3 LLManipRotate::intersectMouseWithSphere( S32 x, S32 y, const LLVector3& sphere_center, F32 sphere_radius)
{
        LLVector3 ray_pt;
        LLVector3 ray_dir;
        mouseToRay( x, y, &ray_pt, &ray_dir);
        return intersectRayWithSphere( ray_pt, ray_dir, sphere_center, sphere_radius );
}

LLVector3 LLManipRotate::intersectRayWithSphere( const LLVector3& ray_pt, const LLVector3& ray_dir, const LLVector3& sphere_center, F32 sphere_radius)
{
        LLVector3 ray_pt_to_center = sphere_center - ray_pt;
        F32 center_distance = ray_pt_to_center.normVec();

        F32 dot = ray_dir * ray_pt_to_center;

        if (dot == 0.f)
        {
                return LLVector3::zero;
        }

        // point which ray hits plane centered on sphere origin, facing ray origin
        LLVector3 intersection_sphere_plane = ray_pt + (ray_dir * center_distance / dot); 
        // vector from sphere origin to the point, normalized to sphere radius
        LLVector3 sphere_center_to_intersection = (intersection_sphere_plane - sphere_center) / sphere_radius;

        F32 dist_squared = sphere_center_to_intersection.magVecSquared();
        LLVector3 result;

        if (dist_squared > 1.f)
        {
                result = sphere_center_to_intersection;
                result.normVec();
        }
        else
        {
                result = sphere_center_to_intersection - ray_dir * sqrt(1.f - dist_squared);
        }

        return result;
}

// Utility function.  Should probably be moved to another class.
//static
void LLManipRotate::mouseToRay( S32 x, S32 y, LLVector3* ray_pt, LLVector3* ray_dir )
{
        if (LLSelectMgr::getInstance()->getSelection()->getSelectType() == SELECT_TYPE_HUD)
        {
                F32 mouse_x = (((F32)x / gViewerWindow->getWindowWidth()) - 0.5f) / gAgent.getAvatarObject()->mHUDCurZoom;
                F32 mouse_y = ((((F32)y) / gViewerWindow->getWindowHeight()) - 0.5f) / gAgent.getAvatarObject()->mHUDCurZoom;

                *ray_pt = LLVector3(-1.f, -mouse_x, mouse_y);
                *ray_dir = LLVector3(1.f, 0.f, 0.f);
        }
        else
        {
                *ray_pt = gAgent.getCameraPositionAgent();
                LLViewerCamera::getInstance()->projectScreenToPosAgent(x, y, ray_dir);
                *ray_dir -= *ray_pt;
                ray_dir->normVec();
        }
}

void LLManipRotate::highlightManipulators( S32 x, S32 y )
{
        mHighlightedPart = LL_NO_PART;

        //LLBBox bbox = LLSelectMgr::getInstance()->getBBoxOfSelection();
        LLViewerObject *first_object = mObjectSelection->getFirstMoveableObject(TRUE);
        
        if (!first_object)
        {
                return;
        }
        
        LLQuaternion object_rot = first_object->getRenderRotation();
        LLVector3 rotation_center = gAgent.getPosAgentFromGlobal(mRotationCenter);
        LLVector3 mouse_dir_x;
        LLVector3 mouse_dir_y;
        LLVector3 mouse_dir_z;
        LLVector3 intersection_roll;

        LLVector3 grid_origin;
        LLVector3 grid_scale;
        LLQuaternion grid_rotation;

        LLSelectMgr::getInstance()->getGrid(grid_origin, grid_rotation, grid_scale);

        LLVector3 rot_x_axis = LLVector3::x_axis * grid_rotation;
        LLVector3 rot_y_axis = LLVector3::y_axis * grid_rotation;
        LLVector3 rot_z_axis = LLVector3::z_axis * grid_rotation;

        F32 proj_rot_x_axis = llabs(rot_x_axis * mCenterToCamNorm);
        F32 proj_rot_y_axis = llabs(rot_y_axis * mCenterToCamNorm);
        F32 proj_rot_z_axis = llabs(rot_z_axis * mCenterToCamNorm);

        F32 min_select_distance = 0.f;
        F32 cur_select_distance = 0.f;

        // test x
        getMousePointOnPlaneAgent(mouse_dir_x, x, y, rotation_center, rot_x_axis);
        mouse_dir_x -= rotation_center;
        // push intersection point out when working at obtuse angle to make ring easier to hit
        mouse_dir_x *= 1.f + (1.f - llabs(rot_x_axis * mCenterToCamNorm)) * 0.1f;

        // test y
        getMousePointOnPlaneAgent(mouse_dir_y, x, y, rotation_center, rot_y_axis);
        mouse_dir_y -= rotation_center;
        mouse_dir_y *= 1.f + (1.f - llabs(rot_y_axis * mCenterToCamNorm)) * 0.1f;

        // test z
        getMousePointOnPlaneAgent(mouse_dir_z, x, y, rotation_center, rot_z_axis);
        mouse_dir_z -= rotation_center;
        mouse_dir_z *= 1.f + (1.f - llabs(rot_z_axis * mCenterToCamNorm)) * 0.1f;

        // test roll
        getMousePointOnPlaneAgent(intersection_roll, x, y, rotation_center, mCenterToCamNorm);
        intersection_roll -= rotation_center;

        F32 dist_x = mouse_dir_x.normVec();
        F32 dist_y = mouse_dir_y.normVec();
        F32 dist_z = mouse_dir_z.normVec();

        F32 distance_threshold = (MAX_MANIP_SELECT_DISTANCE * mRadiusMeters) / gViewerWindow->getWindowHeight();

        if (llabs(dist_x - mRadiusMeters) * llmax(0.05f, proj_rot_x_axis) < distance_threshold)
        {
                // selected x
                cur_select_distance = dist_x * mouse_dir_x * mCenterToCamNorm;
                if (cur_select_distance >= -0.05f && (min_select_distance == 0.f || cur_select_distance > min_select_distance))
                {
                        min_select_distance = cur_select_distance;
                        mHighlightedPart = LL_ROT_X;
                }
        }
        if (llabs(dist_y - mRadiusMeters) * llmax(0.05f, proj_rot_y_axis) < distance_threshold)
        {
                // selected y
                cur_select_distance = dist_y * mouse_dir_y * mCenterToCamNorm;
                if (cur_select_distance >= -0.05f && (min_select_distance == 0.f || cur_select_distance > min_select_distance))
                {
                        min_select_distance = cur_select_distance;
                        mHighlightedPart = LL_ROT_Y;
                }
        }
        if (llabs(dist_z - mRadiusMeters) * llmax(0.05f, proj_rot_z_axis) < distance_threshold)
        {
                // selected z
                cur_select_distance = dist_z * mouse_dir_z * mCenterToCamNorm;
                if (cur_select_distance >= -0.05f && (min_select_distance == 0.f || cur_select_distance > min_select_distance))
                {
                        min_select_distance = cur_select_distance;
                        mHighlightedPart = LL_ROT_Z;
                }
        }

        // test for edge-on intersections
        if (proj_rot_x_axis < 0.05f)
        {
                if ((proj_rot_y_axis > 0.05f && (dist_y * llabs(mouse_dir_y * rot_x_axis) < distance_threshold) && dist_y < mRadiusMeters) ||
                        (proj_rot_z_axis > 0.05f && (dist_z * llabs(mouse_dir_z * rot_x_axis) < distance_threshold) && dist_z < mRadiusMeters))
                {
                        mHighlightedPart = LL_ROT_X;
                }
        }

        if (proj_rot_y_axis < 0.05f)
        {
                if ((proj_rot_x_axis > 0.05f && (dist_x * llabs(mouse_dir_x * rot_y_axis) < distance_threshold) && dist_x < mRadiusMeters) ||
                        (proj_rot_z_axis > 0.05f && (dist_z * llabs(mouse_dir_z * rot_y_axis) < distance_threshold) && dist_z < mRadiusMeters))
                {
                        mHighlightedPart = LL_ROT_Y;
                }
        }

        if (proj_rot_z_axis < 0.05f)
        {
                if ((proj_rot_x_axis > 0.05f && (dist_x * llabs(mouse_dir_x * rot_z_axis) < distance_threshold) && dist_x < mRadiusMeters) ||
                        (proj_rot_y_axis > 0.05f && (dist_y * llabs(mouse_dir_y * rot_z_axis) < distance_threshold) && dist_y < mRadiusMeters))
                {
                        mHighlightedPart = LL_ROT_Z;
                }
        }

        // test for roll
        if (mHighlightedPart == LL_NO_PART)
        {
                F32 roll_distance = intersection_roll.magVec();
                F32 width_meters = WIDTH_PIXELS * mRadiusMeters / RADIUS_PIXELS;

                // use larger distance threshold for roll as it is checked only if something else wasn't highlighted
                if (llabs(roll_distance - (mRadiusMeters + (width_meters * 2.f))) < distance_threshold * 2.f)
                {
                        mHighlightedPart = LL_ROT_ROLL;
                }
                else if (roll_distance < mRadiusMeters)
                {
                        mHighlightedPart = LL_ROT_GENERAL;
                }
        }
}

S32 LLManipRotate::getObjectAxisClosestToMouse(LLVector3& object_axis)
{
        LLSelectNode* first_object_node = mObjectSelection->getFirstMoveableNode(TRUE);

        if (!first_object_node)
        {
                object_axis.clearVec();
                return -1;
        }

        LLQuaternion obj_rotation = first_object_node->mSavedRotation;
        LLVector3 mouse_down_object = mMouseDown * ~obj_rotation;
        LLVector3 mouse_down_abs = mouse_down_object;
        mouse_down_abs.abs();

        S32 axis_index = 0;
        if (mouse_down_abs.mV[VX] > mouse_down_abs.mV[VY] && mouse_down_abs.mV[VX] > mouse_down_abs.mV[VZ])
        {
                if (mouse_down_object.mV[VX] > 0.f)
                {
                        object_axis = LLVector3::x_axis;
                }
                else
                {
                        object_axis = LLVector3::x_axis_neg;
                }
                axis_index = VX;
        }
        else if (mouse_down_abs.mV[VY] > mouse_down_abs.mV[VZ])
        {
                if (mouse_down_object.mV[VY] > 0.f)
                {
                        object_axis = LLVector3::y_axis;
                }
                else
                {
                        object_axis = LLVector3::y_axis_neg;
                }
                axis_index = VY;
        }
        else
        {
                if (mouse_down_object.mV[VZ] > 0.f)
                {
                        object_axis = LLVector3::z_axis;
                }
                else
                {
                        object_axis = LLVector3::z_axis_neg;
                }
                axis_index = VZ;
        }

        return axis_index;
}

//virtual
BOOL LLManipRotate::canAffectSelection()
{
        BOOL can_rotate = mObjectSelection->getObjectCount() != 0;
        if (can_rotate)
        {
                struct f : public LLSelectedObjectFunctor
                {
                        virtual bool apply(LLViewerObject* objectp)
                        {
                                return objectp->permMove() && (objectp->permModify() || !gSavedSettings.getBOOL("EditLinkedParts"));
                        }
                } func;
                can_rotate = mObjectSelection->applyToObjects(&func);
        }
        return can_rotate;
}

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