Holy crap - THANK YOU! I've been needing something like this for a while but don't have the time to learn enough Ruby to make it happen. You ROCK!

This is not a question about ray-tracing in the context of making renderings of a model.

I find myself unable to locate or come up with a quick and efficient way of finding ray reflection paths in sketchup. What I want to be able to do is choose a point (start a line perhaps), choose a second point on a plane, and see the specular reflection path of the line I have defined (angle of incidence = angle of reflection). An example of my intended usage would be something like click a point 5' above the stage in my opera house model, click an angled ceiling reflector, see where the reflection would land in the balcony. Obviously this is for acoustics analysis (I have much more sophisticated tools for performing full geometric modeling calculations), but such a simple capability would be awesome for tweaking reflector angles in the design process. After much searching I cannot find a plugin with this capability or come up with any clever ways of accomplishing it quickly and on-the-fly. Any suggestions?

Thanks in advance!