3D Raycasting with no costumes!!! It's work in progress. Click the green flag and you will be in the map editor. You are the purple dot. Arrow keys to turn. Select a color from the left side. Default is Blue. Make a map by drawing lines. The red button on the top clears everything you drew. Press space to view it in 3D. Press space again to go back to the editor. Set your resolution on the top(Useful when you are viewing in 3D).
If you want to know how it works, click see inside. I have put comments to almost everything so that you can understand. Please try not to use this code. It has so many glitches. I am trying to fix them. The main glitch is, it cant display exactly vertical lines in 3D. The bug is with the linecollision block.