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MoltenCrazy

Preserving ParticleIDs

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What's a good method for preserving particleIDs?

As particles die, Houdini reassigns the IDs, right?

I need to preserve the particleIDs so I can calculate acceleration for multi-step particle motion blur. For this to work, the IDs need to stay consistent and not be reused.

I've tried a combination of the Trail SOP and a SOPSolver looking up the previous frame ID to carry it forward, but once the particles start dying this falls apart.

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mC

 

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Hello, in theory no, if you are simulating something in dops, and your particle die they will have a higher id number. be sure to have 'add id attributes' on in the attributes tab in the popsource.

 

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