It fixed in build 12.0.558, as I can see. Is it fixed completely or partially, but, at least, it works now*. I'm still experimenting.
Thanks again, Mario!
*In Traced Approximation mode looks very good but renders very slowly; in Fast mode is fast.
Edit: First screenshots (left - Fast, 0:23; right - Traced, 19:02)
Edit2: Aha! It's so slow because too low (0.3) Shadow Density in Pyro Shader, that creates by the Fireball shelf tool.
Edit3: It is interesting that the Shadow Color in Pyro shader -> Shading -> Normal Shading has subtractive effect...
Edit4: There are more strange things in the Pyro shader. Color correction in Fire requires 1/gamma (such as 0.45 for gamma 2.2), while CC in Smoke has no effect. The emission brightness depends of the Volume Step Size with which PC generated and of the Volume Step Size in mantra ROP.
Edit5: Decreasing Volume Shadow Quality in Mantra significantly speeds up the Traced Emission.
Edit6: Maybe I was totally wrong, because I reuse the old scene. Experimentation continues...
Edited by nord3d, 08 March 2012 - 02:19 AM.