First render with low error_bound, without aa:

  nearest_count 1
  error_bound 0.1
  save_file "rad"

Then with higher error_bound:

  pretrace_start 1
  pretrace_end 1
  nearest_count 1
  error_bound 0.4
  load_file "rad" always_sample off

This averages more samples from the first render. Setting
nearest_count higher didn't improve quality on the scenes
I have tested this. Just made it slower. The first render
doesn't need to be full resolution because the image isn't
used anyway. When reducing resolution maybe also reduce
minimum_reuse the same amount.

If the scene contains transparent objects this two phase
method also cuts down render time. Just set max_trace_level
to the minimum so that rays still pass through transparent
objects and use diffuse 0, ambient 0, no normal and no
reflection on those objects for the first render.


_____________
Kari Kivisalo

Post a reply to this message