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Issue with FumeFx not accurately reflecting the Age of tyFlow.

The AFC requires a range from 0-1 as input, 0 would be when the particle is created and 1 when it's no longer present.
If tyFflow when you create a custom channel from the Age, make sure to divide it with particle lifespan.
Although, the lifespan is mostly not known as particle can be killed at any frame you can use some arbitrary number.

Velocities from meshes are tricky as tyflow generates mesh at each frame and the topology can change so you cannot determine the travel distance (velocity) for each face individually.

Hope this helps.

Kresimir Tkalcec

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