void Break()
{
RaycastHit hit;
if (Physics.Raycast(cam.transform.position, Quaternion.Euler(new Vector3(-rx, ry, 0)) * new Vector3(0, 0, 1), out hit))
{
VoxelChunk c = hit.transform.gameObject.GetComponent <VoxelChunk>();
if (c != null)
{
c.Break(hit.point, Size);
}
}
}