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It's assumed that point A is at the origin. Let d be the unit vector in the direction point A is currently looking at, and p be the unit vector in the direction of B - A. Notice that d and p necessarily define a plane in 3D-space. If you can imagine this, then it becomes clear that a single rotation of d by an amount equal to the angle between these two ...


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Did some testing and I think your only mistake is in adding the offsets rather than subtracting them. Other than that it's been working for me, although you could simplify those equations quite a bit to get rid of all those divisions. While trying, I've written this example code on JSFiddle. I omitted drawing the grid, but you should see a moving "tile" ...



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