MoltenCrazy 10 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 Share this post Link to post Share on other sites
lyansart 2 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. Share this post Link to post Share on other sites