lltargetingmotion.cpp

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//-----------------------------------------------------------------------------
// Header Files
//-----------------------------------------------------------------------------
#include "linden_common.h"

#include "lltargetingmotion.h"
#include "llcharacter.h"
#include "v3dmath.h"
#include "llcriticaldamp.h"

//-----------------------------------------------------------------------------
// Constants
//-----------------------------------------------------------------------------
const F32 TORSO_TARGET_HALF_LIFE = 0.25f;
const F32 MAX_TIME_DELTA = 2.f; //max two seconds a frame for calculating interpolation
const F32 TARGET_PLANE_THRESHOLD_DOT = 0.6f;
const F32 TORSO_ROT_FRACTION = 0.5f;

//-----------------------------------------------------------------------------
// LLTargetingMotion()
// Class Constructor
//-----------------------------------------------------------------------------
LLTargetingMotion::LLTargetingMotion(const LLUUID &id) : LLMotion(id)
{
        mCharacter = NULL;
        mName = "targeting";

        mTorsoState = new LLJointState;
}


//-----------------------------------------------------------------------------
// ~LLTargetingMotion()
// Class Destructor
//-----------------------------------------------------------------------------
LLTargetingMotion::~LLTargetingMotion()
{
}

//-----------------------------------------------------------------------------
// LLTargetingMotion::onInitialize(LLCharacter *character)
//-----------------------------------------------------------------------------
LLMotion::LLMotionInitStatus LLTargetingMotion::onInitialize(LLCharacter *character)
{
        // save character for future use
        mCharacter = character;

        mPelvisJoint = mCharacter->getJoint("mPelvis");
        mTorsoJoint = mCharacter->getJoint("mTorso");
        mRightHandJoint = mCharacter->getJoint("mWristRight");

        // make sure character skeleton is copacetic
        if (!mPelvisJoint ||
                !mTorsoJoint ||
                !mRightHandJoint)
        {
                llwarns << "Invalid skeleton for targeting motion!" << llendl;
                return STATUS_FAILURE;
        }

        mTorsoState->setJoint( mTorsoJoint );

        // add joint states to the pose
        mTorsoState->setUsage(LLJointState::ROT);
        addJointState( mTorsoState );

        return STATUS_SUCCESS;
}

//-----------------------------------------------------------------------------
// LLTargetingMotion::onActivate()
//-----------------------------------------------------------------------------
BOOL LLTargetingMotion::onActivate()
{
        return TRUE;
}

//-----------------------------------------------------------------------------
// LLTargetingMotion::onUpdate()
//-----------------------------------------------------------------------------
BOOL LLTargetingMotion::onUpdate(F32 time, U8* joint_mask)
{
        F32 slerp_amt = LLCriticalDamp::getInterpolant(TORSO_TARGET_HALF_LIFE);

        LLVector3 target;
        LLVector3* lookAtPoint = (LLVector3*)mCharacter->getAnimationData("LookAtPoint");

        BOOL result = TRUE;

        if (!lookAtPoint)
        {
                return TRUE;
        }
        else
        {
                target = *lookAtPoint;
                target.normVec();
        }
        
        //LLVector3 target_plane_normal = LLVector3(1.f, 0.f, 0.f) * mPelvisJoint->getWorldRotation();
        //LLVector3 torso_dir = LLVector3(1.f, 0.f, 0.f) * (mTorsoJoint->getWorldRotation() * mTorsoState->getRotation());

        LLVector3 skyward(0.f, 0.f, 1.f);
        LLVector3 left(skyward % target);
        left.normVec();
        LLVector3 up(target % left);
        up.normVec();
        LLQuaternion target_aim_rot(target, left, up);

        LLQuaternion cur_torso_rot = mTorsoJoint->getWorldRotation();

        LLVector3 right_hand_at = LLVector3(0.f, -1.f, 0.f) * mRightHandJoint->getWorldRotation();
        left.setVec(skyward % right_hand_at);
        left.normVec();
        up.setVec(right_hand_at % left);
        up.normVec();
        LLQuaternion right_hand_rot(right_hand_at, left, up);

        LLQuaternion new_torso_rot = (cur_torso_rot * ~right_hand_rot) * target_aim_rot;

        // find ideal additive rotation to make torso point in correct direction
        new_torso_rot = new_torso_rot * ~cur_torso_rot;

        // slerp from current additive rotation to ideal additive rotation
        new_torso_rot = nlerp(slerp_amt, mTorsoState->getRotation(), new_torso_rot);

        // constraint overall torso rotation
        LLQuaternion total_rot = new_torso_rot * mTorsoJoint->getRotation();
        total_rot.constrain(F_PI_BY_TWO * 0.8f);
        new_torso_rot = total_rot * ~mTorsoJoint->getRotation();

        mTorsoState->setRotation(new_torso_rot);

        return result;
}

//-----------------------------------------------------------------------------
// LLTargetingMotion::onDeactivate()
//-----------------------------------------------------------------------------
void LLTargetingMotion::onDeactivate()
{
}


// End

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