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Cleanup of "soft hand paddle" collision hackery. Still a hack, but more commented and readable.

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This commit is contained in:
Andrew Meadows 2014-01-17 16:31:06 -08:00
parent aac1764243
commit 3750aa902a
1 changed files with 25 additions and 13 deletions
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38
libraries/particles/src/ParticleCollisionSystem.cpp
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@ -159,22 +159,23 @@ void ParticleCollisionSystem::updateCollisionWithAvatars(Particle* particle) {
glm::vec3 relativeVelocity = collision._addedVelocity - particle->getVelocity();
if (glm::dot(relativeVelocity, collision._penetration) < 0.f) {
// only collide when particle and collision point are moving toward each other
// (doing this prevents some "collision snagging" when particle penetrates the object)
// HACK BEGIN: to make slow particle-paddle collisions mellower
// HACK BEGIN: to allow paddle hands to "hold" particles we attenuate soft collisions against the avatar.
// NOTE: the physics are wrong (particles cannot roll) but it IS possible to catch a slow moving particle.
// TODO: make this less hacky when we have more per-collision details
float elasticity = ELASTICITY;
float damping = glm::length(collision._addedVelocity) / 5.0e-5f;
if (damping < 1.f) {
collision._addedVelocity *= (damping * damping);
elasticity = ELASTICITY * damping;
damping = 0.1f;
} else {
damping = DAMPING;
float SLOW_PADDLE_SPEED = 5.0e-5f;
float attenuationFactor = glm::length(collision._addedVelocity) / SLOW_PADDLE_SPEED;
if (attenuationFactor < 1.f) {
collision._addedVelocity *= attenuationFactor;
elasticity *= attenuationFactor;
}
// HACK END
collision._penetration /= (float)(TREE_SCALE);
updateCollisionSound(particle, collision._penetration, COLLISION_FREQUENCY);
applyHardCollision(particle, collision._penetration, elasticity, damping, collision._addedVelocity);
applyHardCollision(particle, collision._penetration, elasticity, DAMPING, collision._addedVelocity);
}
}
}
@ -184,13 +185,24 @@ void ParticleCollisionSystem::updateCollisionWithAvatars(Particle* particle) {
//qDebug() << "updateCollisionWithAvatars()... node:" << *node << "\n";
if (node->getLinkedData() && node->getType() == NODE_TYPE_AGENT) {
AvatarData* avatar = static_cast<AvatarData*>(node->getLinkedData());
CollisionInfo collision;
if (avatar->findSphereCollision(center, radius, collision)) {
if (glm::dot(particle->getVelocity(), collision._addedVelocity) < 0.f) {
// only collide when particle and collision point are moving toward each other
collision._addedVelocity /= (float)(TREE_SCALE);
glm::vec3 relativeVelocity = collision._addedVelocity - particle->getVelocity();
if (glm::dot(relativeVelocity, collision._penetration) < 0.f) {
// HACK BEGIN: to allow paddle hands to "hold" particles we attenuate soft collisions against the avatar.
// NOTE: the physics are wrong (particles cannot roll) but it IS possible to catch a slow moving particle.
// TODO: make this less hacky when we have more per-collision details
float elasticity = ELASTICITY;
float SLOW_PADDLE_SPEED = 5.0e-5f;
float attenuationFactor = glm::length(collision._addedVelocity) / SLOW_PADDLE_SPEED;
if (attenuationFactor < 1.f) {
collision._addedVelocity *= attenuationFactor;
elasticity *= attenuationFactor;
}
// HACK END
collision._penetration /= (float)(TREE_SCALE);
collision._addedVelocity /= (float)(TREE_SCALE);
updateCollisionSound(particle, collision._penetration, COLLISION_FREQUENCY);
applyHardCollision(particle, collision._penetration, ELASTICITY, DAMPING, collision._addedVelocity);
}