Lightning fast level design & prototyping tool
When designing or prototyping levels you want to iterate often and get feedback fast You want to be able to easily change things without having to worry about the consequences, you never want to redo lots of work because you changed you mind, you want a non-destructive workflow. The last thing you want is wasting time working at the triangle/polygon level when you're still figuring things out! CSG allows you to focus on the design of the level and not have to worry about the details until you choose to