br1 Posted March 30, 2015 Share Posted March 30, 2015 Hi, I can't seem to get correct motion blur with this file. It either goes completely crazy when I render straight from the sim, or I don't have motion blur at all when rendering using disk cache. I'm using 14.0.258 on windows. Can someone double check that it actually works. I've tried plenty of different settings in the camera and the mantra geo samples, I don't remember having that kind of issue before. pop_bubbles_br1.hip Quote Link to comment Share on other sites More sharing options...
Skybar Posted March 30, 2015 Share Posted March 30, 2015 Why dont you use velocity blur? Turn on Render -> Sampling -> Geometry Velocity Blur on your geo node. Quote Link to comment Share on other sites More sharing options...
Sierra62 Posted March 30, 2015 Share Posted March 30, 2015 I have periodically had these issues with 13 and 12.5, the only work around I have found work is to delete the v attribute and use a trail to recalculate the velocity. Quote Link to comment Share on other sites More sharing options...
br1 Posted March 30, 2015 Author Share Posted March 30, 2015 @David : Tried that before posting, it's not doing anything in this case. @Cody : tried that as well, with no luck. I wonder if it's a bug or if there's something wrong in my scene. Never had that kind of issue ... Quote Link to comment Share on other sites More sharing options...
Skybar Posted March 30, 2015 Share Posted March 30, 2015 Thats because your Shutter Time is really low, no? I set that to default (0.5) and velocity blur works fine. In build 14.0.201.13 Quote Link to comment Share on other sites More sharing options...
Skybar Posted March 30, 2015 Share Posted March 30, 2015 As for using deformation blur (Geo Time Samples), try pop down a Time Blend SOP to create sub-frame data based on particle IDs. Quote Link to comment Share on other sites More sharing options...
br1 Posted March 30, 2015 Author Share Posted March 30, 2015 (edited) You nailed it David. So it was a combination of both settings. I played around with camera shutter and left it low, but also tried really high values. I actually needed both higher shutter and compute velocity on the object node. I'm still disturbed by the fact that while using the particles straight from the sim, without disk cache, it was doing the motion blur, although not correctly. Just by creating a disk cache and using it, I completely lost motion blur until I toggled compute velocity back on. I'm surprised because I don't remember ever needing to toggle compute velocity to render motion blurred particles. Thanks for the help ! (never thought it'd be resolved that fast). Edited March 30, 2015 by br1 Quote Link to comment Share on other sites More sharing options...
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