@Override
public void apply(float dt, Particle particle, int index) {
if (particle.getStatus() == Particle.Status.Alive
&& floor.pseudoDistance(particle.getPosition()) <= 0) {
float t =
(floor.getNormal().dot(particle.getPosition()) - floor.getConstant())
/ floor.getNormal().dot(particle.getVelocity());
Vector3f s = particle.getPosition().subtract(particle.getVelocity().mult(t));
this.normal.normalizeLocal();
Vector3f v1 = this.normal.cross(s.subtract(pos));
Vector3f v2 = this.normal.cross(v1);
v1.normalizeLocal();
v2.normalizeLocal();
Vector3f newVel = new Vector3f(particle.getVelocity());
newVel.y *= -bouncyness;
Quaternion q = new Quaternion();
q.fromAxes(v1, this.normal, v2);
newVel = q.mult(newVel);
particle.setVelocity(newVel);
} // if
}
