// direction of aim our object starts with
vector $a = <<0, 0, 1>>;

// vector from our object to the camera
vector $b = unit(<<camera1.translateX - pCube1.translateX, 0, camera1.translateZ - pCube1.translateZ>>);

// find the angle between vectors, convert to degrees
if (camera1.translateX > 0) 
	pCube1.rotateY = acos($a.x*$b.x + $a.z*$b.z) * 57.2957795;
else 
	pCube1.rotateY = acos($a.x*$b.x + $a.z*$b.z) * -57.2957795;