SnarlyGribbly has provided the source code of Particles. I've started to check, and a few lines of Python need some adaptations, which is not a problem. But some of the examples provided such as the Clouds will need to be adapted to Cycles, or at least to PhysicalSurface because the actual mats settings are specifically for Firefly.

But it's manageable.

Glowworm and Shaderspider: I don't know them.

𝒫𝒽𝓎𝓁

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