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avoid div by zero when measuring acceleration

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This commit is contained in:
Andrew Meadows 2018-05-09 12:04:44 -07:00
parent bf466344ee
commit f454dac709
1 changed files with 3 additions and 1 deletions

4
libraries/physics/src/EntityMotionState.cpp
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@ -731,7 +731,9 @@ void EntityMotionState::measureBodyAcceleration() {
// hence the equation for acceleration is: a = (v1 / (1 - D)^dt - v0) / dt
glm::vec3 velocity = getBodyLinearVelocityGTSigma();
_measuredAcceleration = (velocity / powf(1.0f - _body->getLinearDamping(), dt) - _lastVelocity) * invDt;
const float MIN_DAMPING_FACTOR = 0.01f;
float dampingAttenuationFactor = 1.0f / glm::max(powf(1.0f - _body->getLinearDamping(), dt), MIN_DAMPING_FACTOR);
_measuredAcceleration = (velocity * dampingAttenuationFactor - _lastVelocity) * invDt;
_lastVelocity = velocity;
if (numSubsteps > PHYSICS_ENGINE_MAX_NUM_SUBSTEPS) {
// we fall in here when _lastMeasureStep is old: the body has just become active