I have cleaned up the code a bit and decided to release the source. (Floors_src.zip). Please give me feedback on it. I am going to release it as a demo eventually, but for now it could use a bit more work.

Please don't steal this; I have worked a long time on it. However, I have a feeling it is too complex for most people who would steal it to get any use out of it.

It defaults to blocking the cutting of corners, to change that just click on Toggle Cut Corners in the commands tab. (I know having it block cutting corners can be pretty annoying)

In this tab you can also change if you want upper levels to disappear and if you want to just block all corners.

[Edit] This can now be found under My demos.