You should also make a "lite" version, aimed at doing more basic stuff, like a 3d maze, that only has fixed height walls, a single wall texture, etc. It would be easier to write programs with and run faster.

One cool thing that could be written with this engine, assuming doors are supported, would be a RPG. It would be nice to see some sort of 3D-ish RPG using such engine, altough forests would probably look a bit weird if made of walls only.

The problem there is that he is only casting a single Ray for every column, you would need to cast a Ray for every *pixel* for that to work.

Except I seem to remember you writing one

True. Also 3 PS3s together couldn't even get 3 fps on raytracing. Keep in mind it was on a much larger resolution, though, but it tells how much intensive raytracing is.

Yeah I think it was homebrew, not sure anymore, though. It was in 2007 or something.

A n x n map consists of 3 (n+2) x (n+2) arrays: int map, float height, and float alt. For all 3 arrays, array[0][k], array[n+1][k], array[k][0], and array[k][n+1] (the four edges of the array) are padded with 0's for internal reasons. map[p][q] contains the texture number + 1 of the block at (p, q) (so a block using texture 0 would have a 1 here). height[p][q] contains the height of the block at (i, j) (each block is 1x1xheight). alt[p][q] contains the altitude of the bottom of the block at (p, q). For a maze, height should be filled with 1's and alt should be filled with 0's.