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Smooth hips transition between idle and fly.

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Also, take dt into account for the critically damped spring lerp calculation.
This commit is contained in:
Anthony J. Thibault 2018-06-04 16:57:41 -07:00
parent c3d1daf855
commit 558711f906
1 changed files with 12 additions and 6 deletions
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18
interface/src/avatar/MySkeletonModel.cpp
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@ -192,14 +192,20 @@ void MySkeletonModel::updateRig(float deltaTime, glm::mat4 parentTransform) {
AnimPose hips = computeHipsInSensorFrame(myAvatar, isFlying);
// timescale in seconds
const float TRANS_HORIZ_TIMESCALE = 0.25f;
const float TRANS_VERT_TIMESCALE = 0.01f; // We want the vertical component of the hips to follow quickly to prevent spine squash/stretch.
const float ROT_TIMESCALE = 0.15f;
float transHorizAlpha = glm::min(deltaTime / TRANS_HORIZ_TIMESCALE, 1.0f);
float transVertAlpha = glm::min(deltaTime / TRANS_VERT_TIMESCALE, 1.0f);
float rotAlpha = glm::min(deltaTime / ROT_TIMESCALE, 1.0f);
// smootly lerp hips, in sensorframe, with different coeff for horiz and vertical translation.
const float ROT_ALPHA = 0.9f;
const float TRANS_HORIZ_ALPHA = 0.9f;
const float TRANS_VERT_ALPHA = 0.1f;
float hipsY = hips.trans().y;
hips.trans() = lerp(hips.trans(), _prevHips.trans(), TRANS_HORIZ_ALPHA);
hips.trans().y = lerp(hipsY, _prevHips.trans().y, TRANS_VERT_ALPHA);
hips.rot() = safeLerp(hips.rot(), _prevHips.rot(), ROT_ALPHA);
hips.trans() = lerp(_prevHips.trans(), hips.trans(), transHorizAlpha);
hips.trans().y = lerp(_prevHips.trans().y, hipsY, transVertAlpha);
hips.rot() = safeLerp(_prevHips.rot(), hips.rot(), rotAlpha);
_prevHips = hips;
_prevHipsValid = true;