AdrianLazar Posted July 20, 2011 Share Posted July 20, 2011 (edited) Hi guys, I have some troubles making motion blur work correct. You can see in this video that the motion blur has some artifacts: I've also uploaded an image that shows the correct version on the left, the version with the problem on the right. It's because I had cached to disk the simulation and even though I had also the subsets cached the artifact appeared... weird... does anyone know how to properly cache a simulation so that it works fine with motion blur? Thanks, -Adrian Edited July 20, 2011 by AdrianLazar Quote Link to comment Share on other sites More sharing options...
Erik_JE Posted July 20, 2011 Share Posted July 20, 2011 I have never had any problems when writing out sim files with a ROP Output Driver and then loading them in again with a regular File node. Quote Link to comment Share on other sites More sharing options...
smaugthewyrm Posted July 20, 2011 Share Posted July 20, 2011 if your model includes a vector attribute, and you choose bgeo as your file output, then vector attrib is written out and is included when you read the model back in. if instead you are using geo time samples for motion blur, then motion blur should be fine as well... Quote Link to comment Share on other sites More sharing options...
Netvudu Posted July 20, 2011 Share Posted July 20, 2011 what are your "Xform Time Samples" and "Geo Time Samples" values at the Mantra ROP? In a first look, your image looks like you weren´t using enough Geo Time Samples value... Quote Link to comment Share on other sites More sharing options...
smaugthewyrm Posted July 20, 2011 Share Posted July 20, 2011 (edited) adrian, i just came across your post in the sidefx forums. i've attached a hip that might help. rather than re-post... check it out over yonder. sidefx wip cookoff thread Edited July 21, 2011 by smaugthewyrm Quote Link to comment Share on other sites More sharing options...
AdrianLazar Posted July 21, 2011 Author Share Posted July 21, 2011 Guys thanks for the help. Both renders have exactly the same settings, the only difference is that the one on right has the simulation cached, the one on left not. Xform Time Samples are 10 and Geo Time Samples are 5. Quote Link to comment Share on other sites More sharing options...
anim Posted July 21, 2011 Share Posted July 21, 2011 you didn't say what method do you use for caching, but I guess you don't cache trasforms with Dynamics CHOP but rather whole geometry with either file DOP/explicit cache in DOPs or file SOP in SOPs. In case of caching whole geometry you probably need to attach TimeBlend SOP just after Dopimport SOP or File SOP which is importing cached data. It will ensure that the geometry is blended between frames giving you proper deformation motion blur and if you've used CHOPs to cache simulation transforms, then export them to your objects directly, you should get correct transformation motion blur Quote Link to comment Share on other sites More sharing options...
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