int dX = newLocation.x - oldLocation.x;
int dY = newLocation.y - oldLocation.y;
int dZ = newLocation.z - oldLocation.z;
//relative movement
SPacket p = new S0x21(entity, (byte) dX, (byte) dY, (byte) dZ);
// SPacket p = new SPacket(0x22);
// p.addInt(entity.geteid());