Regarding the simplification, it works best on manifold objects. The algorithm works on groups of faces touching each other. A tree has a lot of isolated faces, it will not yield good results.
For instance a leaf made of two triangles will only be simplified as one triangle at best.
Hmm… now I was able to orbit. Dunno why I couldn’t yesterday.
Yes, I didn’t expect much from that tree.
However, it appear that regardless whether I had the slider on 100% or 50% simplification, I got the same amount of polygons. At 50% the polygon count in Transmutr doesn’t match the polygons in SU.
In my case there isn’t a separate opacity map though.
I also noticed there was no material set for the backside. Isn’t that required to render leaves from both sides? (My scene crashes when I try to render so I’ve been unable to fully test. Reported this to ChaosGroup.)