blocking tool

This is a very stripped down verision of a tool I was developing to help with set-design, but which the client pulled at the last minute. You can drag the blocks around, hold shift and drag to stack them. I spent quite a while on the collision detection, you can drag a block underneath an overhanging one, rotate them etc. The final version had different objects, and actors and their paths could be drawn so you could see how they moved through the set. You can view the stage from different sections of the audience as well. This version is a bit buggier than the final one, but gives some idea of how it was meant to work.

there was an answer from another member here, adding a check to the render method, which fixed it.