Set glass or transparent objects like this when saving rad data:

no interior
no normal
no reflection
diffuse 0 ambient 0
filter/transmit only

Then set them back to normal and:

load_file "rad.dat" always_sample off pretrace_start 1 pretrace_end 1

diffuse 0 ambient 0 appeared to speed it most.

This was just from 10 minutes of testing so more quality may
be possible without increasing render time dramatically.

_____________
Kari Kivisalo

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