llkeyframewalkmotion.cpp

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

#include "llkeyframewalkmotion.h"
#include "llcharacter.h"
#include "llmath.h"
#include "m3math.h"
#include "llcriticaldamp.h"

//-----------------------------------------------------------------------------
// Macros
//-----------------------------------------------------------------------------
const F32 MAX_WALK_PLAYBACK_SPEED = 8.f;        // max m/s for which we adjust walk cycle speed

const F32 MIN_WALK_SPEED = 0.1f;        // minimum speed at which we use velocity for down foot detection
const F32 MAX_TIME_DELTA = 2.f;         //max two seconds a frame for calculating interpolation
const F32 SPEED_ADJUST_MAX = 2.5f; // maximum adjustment of walk animation playback speed
const F32 SPEED_ADJUST_MAX_SEC = 3.f;   // maximum adjustment to walk animation playback speed for a second
const F32 DRIFT_COMP_MAX_TOTAL = 0.07f;//0.55f; // maximum drift compensation overall, in any direction 
const F32 DRIFT_COMP_MAX_SPEED = 4.f; // speed at which drift compensation total maxes out
const F32 MAX_ROLL = 0.6f;

//-----------------------------------------------------------------------------
// LLKeyframeWalkMotion()
// Class Constructor
//-----------------------------------------------------------------------------
LLKeyframeWalkMotion::LLKeyframeWalkMotion(const LLUUID &id) : LLKeyframeMotion(id)
{
        mRealTimeLast = 0.0f;
        mAdjTimeLast = 0.0f;
        mCharacter = NULL;
}


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


//-----------------------------------------------------------------------------
// LLKeyframeWalkMotion::onInitialize()
//-----------------------------------------------------------------------------
LLMotion::LLMotionInitStatus LLKeyframeWalkMotion::onInitialize(LLCharacter *character)
{
        mCharacter = character;

        return LLKeyframeMotion::onInitialize(character);
}

//-----------------------------------------------------------------------------
// LLKeyframeWalkMotion::onActivate()
//-----------------------------------------------------------------------------
BOOL LLKeyframeWalkMotion::onActivate()
{
        mRealTimeLast = 0.0f;
        mAdjTimeLast = 0.0f;

        return LLKeyframeMotion::onActivate();
}

//-----------------------------------------------------------------------------
// LLKeyframeWalkMotion::onDeactivate()
//-----------------------------------------------------------------------------
void LLKeyframeWalkMotion::onDeactivate()
{
        mCharacter->removeAnimationData("Down Foot");           
        LLKeyframeMotion::onDeactivate();
}

//-----------------------------------------------------------------------------
// LLKeyframeWalkMotion::onUpdate()
//-----------------------------------------------------------------------------
BOOL LLKeyframeWalkMotion::onUpdate(F32 time, U8* joint_mask)
{
        // compute time since last update
        F32 deltaTime = time - mRealTimeLast;

        void* speed_ptr = mCharacter->getAnimationData("Walk Speed");
        F32 speed = (speed_ptr) ? *((F32 *)speed_ptr) : 1.f;

        // adjust the passage of time accordingly
        F32 adjusted_time = mAdjTimeLast + (deltaTime * speed);

        // save time for next update
        mRealTimeLast = time;
        mAdjTimeLast = adjusted_time;

        // handle wrap around
        if (adjusted_time < 0.0f)
        {
                adjusted_time = getDuration() + fmod(adjusted_time, getDuration());
        }

        // let the base class update the cycle
        return LLKeyframeMotion::onUpdate( adjusted_time, joint_mask );
}

// End


//-----------------------------------------------------------------------------
// LLWalkAdjustMotion()
// Class Constructor
//-----------------------------------------------------------------------------
LLWalkAdjustMotion::LLWalkAdjustMotion(const LLUUID &id) : LLMotion(id)
{
        mLastTime = 0.f;
        mName = "walk_adjust";
}

//-----------------------------------------------------------------------------
// LLWalkAdjustMotion::onInitialize()
//-----------------------------------------------------------------------------
LLMotion::LLMotionInitStatus LLWalkAdjustMotion::onInitialize(LLCharacter *character)
{
        mCharacter = character;
        mLeftAnkleJoint = mCharacter->getJoint("mAnkleLeft");
        mRightAnkleJoint = mCharacter->getJoint("mAnkleRight");

        mPelvisJoint = mCharacter->getJoint("mPelvis");
        mPelvisState.setJoint( mPelvisJoint );
        if ( !mPelvisJoint )
        {
                llwarns << getName() << ": Can't get pelvis joint." << llendl;
                return STATUS_FAILURE;
        }

        mPelvisState.setUsage(LLJointState::POS);
        addJointState( &mPelvisState );

        return STATUS_SUCCESS;
}

//-----------------------------------------------------------------------------
// LLWalkAdjustMotion::onActivate()
//-----------------------------------------------------------------------------
BOOL LLWalkAdjustMotion::onActivate()
{
        mAvgCorrection = 0.f;
        mSpeedAdjust = 0.f;
        mAnimSpeed = 0.f;
        mAvgSpeed = 0.f;
        mRelativeDir = 1.f;
        mPelvisState.setPosition(LLVector3::zero);
        // store ankle positions for next frame
        mLastLeftAnklePos = mCharacter->getPosGlobalFromAgent(mLeftAnkleJoint->getWorldPosition());
        mLastRightAnklePos = mCharacter->getPosGlobalFromAgent(mRightAnkleJoint->getWorldPosition());

        F32 leftAnkleOffset = (mLeftAnkleJoint->getWorldPosition() - mCharacter->getCharacterPosition()).magVec();
        F32 rightAnkleOffset = (mRightAnkleJoint->getWorldPosition() - mCharacter->getCharacterPosition()).magVec();
        mAnkleOffset = llmax(leftAnkleOffset, rightAnkleOffset);

        return TRUE;
}

//-----------------------------------------------------------------------------
// LLWalkAdjustMotion::onUpdate()
//-----------------------------------------------------------------------------
BOOL LLWalkAdjustMotion::onUpdate(F32 time, U8* joint_mask)
{
        LLVector3 footCorrection;
        LLVector3 vel = mCharacter->getCharacterVelocity() * mCharacter->getTimeDilation();
        F32 deltaTime = llclamp(time - mLastTime, 0.f, MAX_TIME_DELTA);
        mLastTime = time;

        LLQuaternion inv_rotation = ~mPelvisJoint->getWorldRotation();

        // get speed and normalize velocity vector
        LLVector3 ang_vel = mCharacter->getCharacterAngularVelocity() * mCharacter->getTimeDilation();
        F32 speed = llmin(vel.normVec(), MAX_WALK_PLAYBACK_SPEED);
        mAvgSpeed = lerp(mAvgSpeed, speed, LLCriticalDamp::getInterpolant(0.2f));

        // calculate facing vector in pelvis-local space 
        // (either straight forward or back, depending on velocity)
        LLVector3 localVel = vel * inv_rotation;
        if (localVel.mV[VX] > 0.f)
        {
                mRelativeDir = 1.f;
        }
        else if (localVel.mV[VX] < 0.f)
        {
                mRelativeDir = -1.f;
        }

        // calculate world-space foot drift
        LLVector3 leftFootDelta;
        LLVector3 leftFootWorldPosition = mLeftAnkleJoint->getWorldPosition();
        LLVector3d leftFootGlobalPosition = mCharacter->getPosGlobalFromAgent(leftFootWorldPosition);
        leftFootDelta.setVec(mLastLeftAnklePos - leftFootGlobalPosition);
        mLastLeftAnklePos = leftFootGlobalPosition;

        LLVector3 rightFootDelta;
        LLVector3 rightFootWorldPosition = mRightAnkleJoint->getWorldPosition();
        LLVector3d rightFootGlobalPosition = mCharacter->getPosGlobalFromAgent(rightFootWorldPosition);
        rightFootDelta.setVec(mLastRightAnklePos - rightFootGlobalPosition);
        mLastRightAnklePos = rightFootGlobalPosition;

        // find foot drift along velocity vector
        if (mAvgSpeed > 0.1)
        {
                // walking/running
                F32 leftFootDriftAmt = leftFootDelta * vel;
                F32 rightFootDriftAmt = rightFootDelta * vel;

                if (rightFootDriftAmt > leftFootDriftAmt)
                {
                        footCorrection = rightFootDelta;
                } else
                {
                        footCorrection = leftFootDelta;
                }
        }
        else
        {
                mAvgSpeed = ang_vel.magVec() * mAnkleOffset;
                mRelativeDir = 1.f;

                // standing/turning
                // find the lower foot
                if (leftFootWorldPosition.mV[VZ] < rightFootWorldPosition.mV[VZ])
                {
                        // pivot on left foot
                        footCorrection = leftFootDelta;
                }
                else
                {
                        // pivot on right foot
                        footCorrection = rightFootDelta;
                }
        }

        // rotate into avatar coordinates
        footCorrection = footCorrection * inv_rotation;

        // calculate ideal pelvis offset so that foot is glued to ground and damp towards it
        // the amount of foot slippage this frame + the offset applied last frame
        mPelvisOffset = mPelvisState.getPosition() + lerp(LLVector3::zero, footCorrection, LLCriticalDamp::getInterpolant(0.2f));

        // pelvis drift (along walk direction)
        mAvgCorrection = lerp(mAvgCorrection, footCorrection.mV[VX] * mRelativeDir, LLCriticalDamp::getInterpolant(0.1f));

        // calculate average velocity of foot slippage
        F32 footSlipVelocity = (deltaTime != 0.f) ? (-mAvgCorrection / deltaTime) : 0.f;

        F32 newSpeedAdjust = 0.f;
        
        // modulate speed by dot products of facing and velocity
        // so that if we are moving sideways, we slow down the animation
        // and if we're moving backward, we walk backward

        F32 directional_factor = localVel.mV[VX] * mRelativeDir;
        if (speed > 0.1f)
        {
                // calculate ratio of desired foot velocity to detected foot velocity
                newSpeedAdjust = llclamp(footSlipVelocity - mAvgSpeed * (1.f - directional_factor), 
                                                                -SPEED_ADJUST_MAX, SPEED_ADJUST_MAX);
                newSpeedAdjust = lerp(mSpeedAdjust, newSpeedAdjust, LLCriticalDamp::getInterpolant(0.2f));

                F32 speedDelta = newSpeedAdjust - mSpeedAdjust;
                speedDelta = llclamp(speedDelta, -SPEED_ADJUST_MAX_SEC * deltaTime, SPEED_ADJUST_MAX_SEC * deltaTime);

                mSpeedAdjust = mSpeedAdjust + speedDelta;
        }
        else
        {
                mSpeedAdjust = lerp(mSpeedAdjust, 0.f, LLCriticalDamp::getInterpolant(0.2f));
        }

        mAnimSpeed = (mAvgSpeed + mSpeedAdjust) * mRelativeDir;
//      char debug_text[64];
//      sprintf(debug_text, "Foot slip vel: %.2f", footSlipVelocity);
//      mCharacter->addDebugText(debug_text);
//      sprintf(debug_text, "Speed: %.2f", mAvgSpeed);
//      mCharacter->addDebugText(debug_text);
//      sprintf(debug_text, "Speed Adjust: %.2f", mSpeedAdjust);
//      mCharacter->addDebugText(debug_text);
//      sprintf(debug_text, "Animation Playback Speed: %.2f", mAnimSpeed);
//      mCharacter->addDebugText(debug_text);
        mCharacter->setAnimationData("Walk Speed", &mAnimSpeed);

        // clamp pelvis offset to a 90 degree arc behind the nominal position
        F32 drift_comp_max = llclamp(speed, 0.f, DRIFT_COMP_MAX_SPEED) / DRIFT_COMP_MAX_SPEED;
        drift_comp_max *= DRIFT_COMP_MAX_TOTAL;

        LLVector3 currentPelvisPos = mPelvisState.getJoint()->getPosition();

        // NB: this is an ADDITIVE amount that is accumulated every frame, so clamping it alone won't do the trick
        // must clamp with absolute position of pelvis in mind
        mPelvisOffset.mV[VX] = llclamp( mPelvisOffset.mV[VX], -drift_comp_max - currentPelvisPos.mV[VX], drift_comp_max - currentPelvisPos.mV[VX]  );
        mPelvisOffset.mV[VY] = llclamp( mPelvisOffset.mV[VY], -drift_comp_max - currentPelvisPos.mV[VY], drift_comp_max - currentPelvisPos.mV[VY]);
        mPelvisOffset.mV[VZ] = 0.f;

        // set position
        mPelvisState.setPosition(mPelvisOffset);

        mCharacter->setAnimationData("Pelvis Offset", &mPelvisOffset);

        return TRUE;
}

//-----------------------------------------------------------------------------
// LLWalkAdjustMotion::onDeactivate()
//-----------------------------------------------------------------------------
void LLWalkAdjustMotion::onDeactivate()
{
        mCharacter->removeAnimationData("Walk Speed");
}

//-----------------------------------------------------------------------------
// LLFlyAdjustMotion::onInitialize()
//-----------------------------------------------------------------------------
LLMotion::LLMotionInitStatus LLFlyAdjustMotion::onInitialize(LLCharacter *character)
{
        mCharacter = character;

        LLJoint* pelvisJoint = mCharacter->getJoint("mPelvis");
        mPelvisState.setJoint( pelvisJoint );
        if ( !pelvisJoint )
        {
                llwarns << getName() << ": Can't get pelvis joint." << llendl;
                return STATUS_FAILURE;
        }

        mPelvisState.setUsage(LLJointState::POS | LLJointState::ROT);
        addJointState( &mPelvisState );

        return STATUS_SUCCESS;
}

//-----------------------------------------------------------------------------
// LLFlyAdjustMotion::onActivate()
//-----------------------------------------------------------------------------
BOOL LLFlyAdjustMotion::onActivate()
{
        mPelvisState.setPosition(LLVector3::zero);
        mPelvisState.setRotation(LLQuaternion::DEFAULT);
        mRoll = 0.f;
        return TRUE;
}

//-----------------------------------------------------------------------------
// LLFlyAdjustMotion::onUpdate()
//-----------------------------------------------------------------------------
BOOL LLFlyAdjustMotion::onUpdate(F32 time, U8* joint_mask)
{
        LLVector3 ang_vel = mCharacter->getCharacterAngularVelocity() * mCharacter->getTimeDilation();
        F32 speed = mCharacter->getCharacterVelocity().magVec();

        F32 roll_factor = clamp_rescale(speed, 7.f, 15.f, 0.f, -MAX_ROLL);
        F32 target_roll = llclamp(ang_vel.mV[VZ], -4.f, 4.f) * roll_factor;

        // roll is critically damped interpolation between current roll and angular velocity-derived target roll
        mRoll = lerp(mRoll, target_roll, LLCriticalDamp::getInterpolant(0.1f));

//      llinfos << mRoll << llendl;

        LLQuaternion roll(mRoll, LLVector3(0.f, 0.f, 1.f));
        mPelvisState.setRotation(roll);

//      F32 lerp_amt = LLCriticalDamp::getInterpolant(0.2f);
//      
//      LLVector3 pelvis_correction = mPelvisState.getPosition() - lerp(LLVector3::zero, mPelvisState.getJoint()->getPosition() + mPelvisState.getPosition(), lerp_amt);
//      mPelvisState.setPosition(pelvis_correction);
        return TRUE;
}

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