Doum Posted June 17, 2013 Share Posted June 17, 2013 (edited) Hey all, I hope someone can shed some light on this. I'm trying to understand the motion blur in the rop alembic OUT node. I need to make them match with XSI, that why I need to understand them better. Here what I think, correct me if I'm wrong... - If I check the "use motion blur" box : Samples : 0 Linear interpolation with no motion blur sub-frames. (ie frame: 5 / 6 ) Samples : 2 2 sub-frames (ie frame: 5 / 5.33 / 5.66 / 6 ) The Shutter also give me interrogation: The XSI default is set to 0.25 - 0.75. Do I need to make my ROP alembic Shutter match with the one from XSI ? thanks Doum After some test, I've clarified the meaning of these setting and make them match in XSI(arnold). - If I check the "use motion blur" box : Samples : 2 mean 1 sub-frames and the next frame. (ie frame: 5 / 5.5 / 6 ) Samples : 4 mean 3 sub-frames and the next frame. (ie frame: 5 / 5.25 / 5.5 / 5.75 / 6 ) For the shutter part, it's seam to clip between the values you give. Sorry, I'm not able to explain in number what it would gives, but I let it to the default values 0-1. I hope it could help someone Edited June 17, 2013 by Doum 1 Quote Link to comment Share on other sites More sharing options...
Tylius Posted June 19, 2013 Share Posted June 19, 2013 (edited) I tried to export fluid simulation from houdini in alembic format with motion blur activated, But in Maya no motion blur appear with vray or Arnold ... Anyone achieve to get a nice motion blur with Alembic export from houdini ? Any Idea ? Edited June 19, 2013 by Tylius Quote Link to comment Share on other sites More sharing options...
Doum Posted June 20, 2013 Author Share Posted June 20, 2013 It gives me an error when I try to render an alembic fluid from houdini with arnold in xsi. It give me "wrong number of normal indices" error... did you tried the .bin format? Doum Quote Link to comment Share on other sites More sharing options...
Mikael Posted November 22, 2013 Share Posted November 22, 2013 (edited) I'm currently testing to export particles with copied spheres on to render in maya and vray. I got it to work when I set motion samples 2 (as mentioned above 1 sub frame and the next frame) in houdini and set shutter angle to 180. when rendering with vray, maya jumps to a subframe (shutter angle == 0.5 frames) so maybe maya needs to be on that exact subframe when rendering, though I don't know how to calculate the different subframes for different shutter angles. we also tried to write out .bin with realflows plugin to houdini, then from realflow to maya. It workt great, but in my mind that makes a unnecessary step... Mike Edited November 22, 2013 by Mikael Quote Link to comment Share on other sites More sharing options...
Doum Posted November 25, 2013 Author Share Posted November 25, 2013 Hey Mike, Did you try to offset the shutter, in XSI you can set the shutter on 3 "position". start on frame, center on frame, end on frame. Look like only end on frame give a correct result. Shutter position: start on frame : current frame --> next frame center on frame: between previous frame and current frame --> between current frame and next frame end on frame: previous frame --> current frame I hope it help you 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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