Hans -

Thanks for the tests! I suspect my problem is memory size; I'm still running 32-bit XP on this machine, and the one time I gave it several hours to process, the render routine simply returned the 'start' button active, which SH3D appears to do after some types of failure. (I have a garage door object I brutally hacked into size with Sketchup in the days before I knew how to use Sketchup, the mere presence of which anywhere in a home plan manages to kill any render of any scene in the plan.) As best I can tell -- and I've only looked at the stock SunFlow source, not the bugfixed version Emmanuel includes -- any value greater than 5 is set to 5, so that should be the maximum over-sample available.

I think I've identified where the potential problems with aa = 11 arise, but I'm up against my current understanding of vector math *and* Java syntax, so I need to study some more before I can move on.

Thanks,
maz