MoltenCrazy Posted May 20, 2019 Share Posted May 20, 2019 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. -- mC Quote Link to comment Share on other sites More sharing options...
lyansart Posted May 21, 2019 Share Posted May 21, 2019 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. Quote Link to comment Share on other sites More sharing options...
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