@thomthom said:

Does it happen in SU7?
There is a bug in the raytracing function in SU8.

It seems to work in SU7.
Guess I'll use 7 till it works in 8.

Thanks!

fH

I just discovered RayTrace/Spray today; I was searching for a plugin with just this sort of functionality and this appears to be the only one of its kind.

If I may offer some feedback:

I'm using it in Sketchup 8.0.3117 and am encountering some odd behaviour.
For some reason, using RayTrace, sometimes a ray will bounce, and sometimes it just stops short of the next plane, even within a fully enclosed volume. As far as I can tell there is no consistency to this behaviour and thus no telling how many bounces (if any) a ray will perform before abruptly terminating mid-flight.

Any ideas?