Expressions on Uncached Particle Attributes?

#1

I’ve been working all day on this problem and can’t find a conclusive answer.

I have created a particle cache file (.pdc) external to Maya, and am reading it in to a basic particleShape node. My pdc file only has a few attributes cached, important things like position, velocity, and particleId. It does not have opacityPP cached.

I’d like to write an expression to drive opacityPP, but I type in “particleShape1.opacityPP = 0.0” to a creation expression, and the particles render at full non-zero opacity.

I would think this means that if you’re using a particle cache, none of its attributes are dynamic. But if I attach a ramp to the opacityPP, it’s completely remappable. Why is this ramp working if all attributes are locked in by the cache?

Can I make a particle expression dynamic on a cached particleShape?

Thanks!
AJ

#2

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