Hello,
I haven't seen an answer to this anywhere, and honestly I haven't tried to figure this out myself, but I was wondering if you could use the pointer to determine the face it is pointing to? I am making a 3-D tile map builder using Unity, but I would much rather use AppGameKit (I just like it more). The biggest challenge I can imagine is finding the coordinates of the face that the pointer is hitting. Essentially the way it should work is you point at the side of a cube, hit a button, and another cube is added to that side--similar to how it works in Minecraft, Fallout 4, or Rust.
Thanks for enabling my laziness!