Zabander Posted March 17, 2016 Share Posted March 17, 2016 Hey guys!, have an issue exporting liquid mesh from from Houdini to Maya, when I import it using alembic. When I turn motion blur it just doesn't work, any ideas?? thanks! Quote Link to comment Share on other sites More sharing options...
djiki Posted March 17, 2016 Share Posted March 17, 2016 Yes. It is standard alembic problem. Alembic exporter recognizes fixed topology and optimize file size based on it. If topology is constant over time it could be resampled in any fractional time in the middle of any two succesive frames simple by blending position vector from previous frame to next one. And that approach is used for motion blur.calc. Exporting fluid meshes and similar "topology changing over time" primitives require velocity attribute on points for proper calculation of motion blur since there is no way to match point position from one frame to another. In alembic exporter node turn on export attributes. Before that check that geometry you are exporting really has velocity attribute cheers Quote Link to comment Share on other sites More sharing options...
fathom Posted March 17, 2016 Share Posted March 17, 2016 yeah, changing topology requires velocities for each point to do blur.... but does the renderer you're using support velocity vector motion blur? Quote Link to comment Share on other sites More sharing options...
Zabander Posted March 22, 2016 Author Share Posted March 22, 2016 (edited) Im curently using vray, in Maya. I turned on the export velocity in the rop_alembic node but it doesn't arrive to Maya, inside Houdini works fine when I reimport the alembic back but in maya doesn't work. Apparently is an issue with Maya. I have to convert to vramesh to render. Edited March 22, 2016 by Zabander Quote Link to comment Share on other sites More sharing options...
anim Posted March 22, 2016 Share Posted March 22, 2016 you can use Vray Proxy and load alembic directly through it at render time, it will have correct motion blur if you have v attribute however we experienced sudden UV loss on some frames if the geometry has changed topology to address that you may need to export abc per frme and then load as Vray Proxy using <frame> token Quote Link to comment Share on other sites More sharing options...
Zabander Posted April 5, 2016 Author Share Posted April 5, 2016 Thank you anim! works good! 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...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.