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reduce snagging when walking across voxel seams

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This commit is contained in:
Andrew Meadows 2014-05-05 12:33:05 -07:00
parent ddc9408a55
commit 6b129c86d0
1 changed files with 48 additions and 4 deletions
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52
interface/src/avatar/MyAvatar.cpp
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@ -937,11 +937,55 @@ void MyAvatar::updateCollisionWithVoxels(float deltaTime, float radius) {
if (Application::getInstance()->getVoxelTree()->findShapeCollisions(&boundingShape, myCollisions)) {
const float VOXEL_ELASTICITY = 0.0f;
const float VOXEL_DAMPING = 0.0f;
for (int i = 0; i < myCollisions.size(); ++i) {
CollisionInfo* collision = myCollisions[i];
applyHardCollision(collision->_penetration, VOXEL_ELASTICITY, VOXEL_DAMPING);
_lastFloorContactPoint = collision->_contactPoint - collision->_penetration;
if (glm::length2(_gravity) > EPSILON) {
if (myCollisions.size() == 1) {
// trivial case
CollisionInfo* collision = myCollisions[0];
applyHardCollision(collision->_penetration, VOXEL_ELASTICITY, VOXEL_DAMPING);
} else {
// This is special collision handling for when walking on a voxel field which
// prevents snagging at corners and seams.
// sift through the collisions looking for one against the "floor"
int floorIndex = 0;
float distanceToFloor = 0.0f;
float penetrationWithFloor = 0.0f;
for (int i = 0; i < myCollisions.size(); ++i) {
CollisionInfo* collision = myCollisions[i];
float distance = glm::dot(_gravity, collision->_contactPoint - _position);
if (distance > distanceToFloor) {
distanceToFloor = distance;
penetrationWithFloor = glm::dot(_gravity, collision->_penetration);
floorIndex = i;
}
}
// step through the collisions again and apply each that is not redundant
glm::vec3 oldPosition = _position;
for (int i = 0; i < myCollisions.size(); ++i) {
CollisionInfo* collision = myCollisions[i];
if (i == floorIndex) {
applyHardCollision(collision->_penetration, VOXEL_ELASTICITY, VOXEL_DAMPING);
} else {
float distance = glm::dot(_gravity, collision->_contactPoint - oldPosition);
float penetration = glm::dot(_gravity, collision->_penetration);
if (distance - distanceToFloor > penetrationWithFloor || penetration > penetrationWithFloor) {
// resolution of the deepest penetration would not resolve this one
// so we apply the collision
applyHardCollision(collision->_penetration, VOXEL_ELASTICITY, VOXEL_DAMPING);
}
}
}
}
} else {
// no gravity -- apply all collisions
for (int i = 0; i < myCollisions.size(); ++i) {
CollisionInfo* collision = myCollisions[i];
applyHardCollision(collision->_penetration, VOXEL_ELASTICITY, VOXEL_DAMPING);
}
}
const float VOXEL_COLLISION_FREQUENCY = 0.5f;
updateCollisionSound(myCollisions[0]->_penetration, deltaTime, VOXEL_COLLISION_FREQUENCY);
}