bool Avatar::findParticleCollisions(const glm::vec3& particleCenter, float particleRadius, CollisionList& collisions) {
if (_collisionFlags & COLLISION_GROUP_PARTICLES) {
return false;
}
bool collided = false;
// first do the hand collisions
const HandData* handData = getHandData();
if (handData) {
for (int i = 0; i < NUM_HANDS; i++) {
const PalmData* palm = handData->getPalm(i);
if (palm && palm->hasPaddle()) {
// create a disk collision proxy where the hand is
glm::vec3 fingerAxis(0.f);
for (size_t f = 0; f < palm->getNumFingers(); ++f) {
const FingerData& finger = (palm->getFingers())[f];
if (finger.isActive()) {
// compute finger axis
glm::vec3 fingerTip = finger.getTipPosition();
glm::vec3 fingerRoot = finger.getRootPosition();
fingerAxis = glm::normalize(fingerTip - fingerRoot);
break;
}
}
int jointIndex = -1;
glm::vec3 handPosition;
if (i == 0) {
_skeletonModel.getLeftHandPosition(handPosition);
jointIndex = _skeletonModel.getLeftHandJointIndex();
}
else {
_skeletonModel.getRightHandPosition(handPosition);
jointIndex = _skeletonModel.getRightHandJointIndex();
}
glm::vec3 diskCenter = handPosition + HAND_PADDLE_OFFSET * fingerAxis;
glm::vec3 diskNormal = palm->getNormal();
const float DISK_THICKNESS = 0.08f;
// collide against the disk
glm::vec3 penetration;
if (findSphereDiskPenetration(particleCenter, particleRadius,
diskCenter, HAND_PADDLE_RADIUS, DISK_THICKNESS, diskNormal,
penetration)) {
CollisionInfo* collision = collisions.getNewCollision();
if (collision) {
collision->_type = PADDLE_HAND_COLLISION;
collision->_flags = jointIndex;
collision->_penetration = penetration;
collision->_addedVelocity = palm->getVelocity();
collided = true;
} else {
// collisions are full, so we might as well bail now
return collided;
}
}
}
}
}
// then collide against the models
int preNumCollisions = collisions.size();
if (_skeletonModel.findSphereCollisions(particleCenter, particleRadius, collisions)) {
// the Model doesn't have velocity info, so we have to set it for each new collision
int postNumCollisions = collisions.size();
for (int i = preNumCollisions; i < postNumCollisions; ++i) {
CollisionInfo* collision = collisions.getCollision(i);
collision->_penetration /= (float)(TREE_SCALE);
collision->_addedVelocity = getVelocity();
}
collided = true;
}
return collided;
}
