Rotating the filaments in par can beams works nicely in my plot.
But this will have no effect in the modelwindow though. There all pars are perfectly round.
Or in some cases, depending on how they are focused, not all
of the beam gets properly rendered in the model window. It can look like as if there was a semitransparent shutter pushed into it.
Haven't noticed this before, but then I've never really used that model much before. Now that I'm a teacher for a while I use it a lot!
Its very helpful and the rendering now is quicker than ever
