updateProxy method
Update the proxy of the shape.
Implementation
@override
	void updateProxy(){
		double p = aabbProx;
		aabb.set(
			position.x - radius - p, position.x + radius + p,
			position.y - radius - p, position.y + radius + p,
			position.z - radius - p, position.z + radius + p
		);
		if(proxy != null) proxy!.update();
	}