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reduce number of updates for fast-moving objects

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This commit is contained in:
Andrew Meadows 2016-04-19 13:18:29 -07:00
parent a79f49a5cd
commit a3c66d8c91
1 changed files with 19 additions and 12 deletions
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31
libraries/physics/src/EntityMotionState.cpp
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@ -178,11 +178,13 @@ bool EntityMotionState::isMoving() const {
// (2) at the beginning of each simulation step for KINEMATIC RigidBody's --
// it is an opportunity for outside code to update the object's simulation position
void EntityMotionState::getWorldTransform(btTransform& worldTrans) const {
BT_PROFILE("getWorldTransform");
if (!_entity) {
return;
}
assert(entityTreeIsLocked());
if (_motionType == MOTION_TYPE_KINEMATIC) {
BT_PROFILE("kinematicIntegration");
// This is physical kinematic motion which steps strictly by the subframe count
// of the physics simulation.
uint32_t thisStep = ObjectMotionState::getWorldSimulationStep();
@ -270,6 +272,7 @@ bool EntityMotionState::remoteSimulationOutOfSync(uint32_t simulationStep) {
_serverPosition = bulletToGLM(xform.getOrigin());
_serverRotation = bulletToGLM(xform.getRotation());
_serverVelocity = getBodyLinearVelocityGTSigma();
_serverAcceleration = Vectors::ZERO;
_serverAngularVelocity = bulletToGLM(_body->getAngularVelocity());
_lastStep = simulationStep;
_serverActionData = _entity->getActionData();
@ -336,19 +339,23 @@ bool EntityMotionState::remoteSimulationOutOfSync(uint32_t simulationStep) {
glm::vec3 position = bulletToGLM(worldTrans.getOrigin());
float dx2 = glm::distance2(position, _serverPosition);
const float MAX_POSITION_ERROR_SQUARED = 0.000004f; // Sqrt() - corresponds to 2 millimeters
const float MAX_POSITION_ERROR_SQUARED = 0.000004f; // corresponds to 2mm
if (dx2 > MAX_POSITION_ERROR_SQUARED) {
#ifdef WANT_DEBUG
qCDebug(physics) << ".... (dx2 > MAX_POSITION_ERROR_SQUARED) ....";
qCDebug(physics) << "wasPosition:" << wasPosition;
qCDebug(physics) << "bullet position:" << position;
qCDebug(physics) << "_serverPosition:" << _serverPosition;
qCDebug(physics) << "dx2:" << dx2;
#endif
return true;
// we don't mind larger position error when the object has high speed
// so we divide by speed and check again
float speed2 = glm::length2(_serverVelocity);
const float MIN_ERROR_RATIO_SQUARED = 0.0025f; // corresponds to 5% error in 1 second
const float MIN_SPEED_SQUARED = 1.0e-6f; // corresponds to 1mm/sec
if (speed2 < MIN_SPEED_SQUARED || dx2 / speed2 > MIN_ERROR_RATIO_SQUARED) {
#ifdef WANT_DEBUG
qCDebug(physics) << ".... (dx2 > MAX_POSITION_ERROR_SQUARED) ....";
qCDebug(physics) << "wasPosition:" << wasPosition;
qCDebug(physics) << "bullet position:" << position;
qCDebug(physics) << "_serverPosition:" << _serverPosition;
qCDebug(physics) << "dx2:" << dx2;
#endif
return true;
}
}
if (glm::length2(_serverAngularVelocity) > 0.0f) {