Projector script?

Look at this thread half a page down in the thread list.

It is not ideal with this type of shadowing technique for all the objects in the map as it would run slow. I do not believe that the shadow technique used here is not hardware accelerated, or not 100% hardware accelerated anyways.

The code in the linked thread is far from release quality and does not contain any of the optimizations or nice features in my upcoming release. Right now I am trying to resolve some issues with the mac version (that also effect the early release to a limited extent). Expect a release "soon", certainly in plenty of time for phase 2 (if that's your target).

As for the efficiency, yes, there is certainly additional CPU and GPU load from using this as it has to render several extra textures. However, the pending release has many optimizations over a naive implementation, including minimizing detaches and attaches and reducing the FPS of the shadow for selected objects.

Then again, multiple shadows does have a non-trivial GPU pixel-pushing overhead for just rendering them onto objects (in particular large static meshes), so using lots of shadows on everything is not a great idea. However in the upcoming release you can tune how many shadows various kinds of objects cast (and if they should be blob shadows or full rendered shadows) to minimize this.