My raycaster render engine demo

My raycaster render engine demo based on Lode Vandevenne's raycaster tutorial. Games like Wolfenstein 3d and Rise of the Triad use similar raycaster techniques to this. Features added: - skydome - sprites support alpha blending (the tree object has some shadow under its pot, see 0:30) - a single box can have different textures on all 6 sides (or each side can be missing) - 2nd and 3rd levels of walls, camera can move up and down - thin walls (windows) - fog effect - further walls are darker in this case - to speed up rendering, a post effect shader is used to apply fog on the image and render the skydome Experimenting with this technique took place in summer, 2011.