Mental Ray: Alpha channel not matching and being noisy.
None moving noise pattern. using mia shader.
Adding bubbles addes 36 hours of rendering.
Need to cache RF4 particles to get multi streaked motion blurred particles.
Renderman: weak alpha channels.
File not opening possibly because using 7 million particles.
File crash- working from 64 to 32..
Long render times--
Memory Issues:
Caching was running out of memory in maya.
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Lessons:
Multiple passes in Maya ( 16- 20)
Motion blur helps.