johnm Posted September 1, 2012 Share Posted September 1, 2012 How does one properly export deforming geometry from maya and import it into houdini in such a way that deformation motion blur works correctly with a 0.5 shutter interval? Maya's alembic export settings: step size = 1, and FrameRelativeSample = 0.0 and 0.5 houdini is set up with camera shutter=0.5 geo_motionsamples=2 I'm getting intermittent frames with no motion blur at all, and, motion blur is as though shutter=1.0. I know I can work around the issue by lerping the geometry sampled at the integer frame values, but I was hoping I wouldn't have to. Quote Link to comment Share on other sites More sharing options...
moondeer Posted September 3, 2012 Share Posted September 3, 2012 maybe you can post a link to a small example alembic file output in the same manner? Quote Link to comment Share on other sites More sharing options...
dbukovec Posted September 3, 2012 Share Posted September 3, 2012 hi! put a time blend sop after the alembic sop Quote Link to comment Share on other sites More sharing options...
woodenduck Posted September 3, 2012 Share Posted September 3, 2012 Yeah, Timeblend should sort you out. You may need to calculate velocity also (trail sop set to compute velocity). Quote Link to comment Share on other sites More sharing options...
johnm Posted September 3, 2012 Author Share Posted September 3, 2012 thought I'd share what I found... First of all, timeblending the geo sampled at integer frame values (lerping translated, for all you youngsters) is fine and all, but I was looking to tap into the sub-sampled geo data. Secondly, point velocity doesn't apply in this situation as we're dealing with deformation blur. My problem was my understanding of what I'd get from Maya's Frame Relative Sampling. The attached rendered pics show a camera shutter angle ramping from 0 to 1.0, with mantra's Geo Time Samples set to 5. The Maya alembic export settings were: -Evaluate Every 1.0 frames (ie integer frame samples) -Evaluate Every 0.1 frames (10 samples per frame) -Evaluate Every 1.0, with Frame Relative Sampling Low=0.0 and High=0.5 and the timeblend version is for comparison. 1 Quote Link to comment Share on other sites More sharing options...
cgvirus Posted April 18, 2016 Share Posted April 18, 2016 I have come up with some solution: https://vimeo.com/163285493 Quote Link to comment Share on other sites More sharing options...
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