public VerletParticle3D clearVelocity() {
prev.set(this);
return this;
}
public VerletParticle3D setPreviousPosition(Vec3D p) {
prev.set(p);
return this;
}
protected void applyForce() {
temp.set(this);
addSelf(sub(prev).addSelf(force.scale(weight)));
prev.set(temp);
force.clear();
}