Motion blur on USD Point Instancer

[Anonymous]

Arnold 6.2.1.0

H18.5.532

Motion blur for the Point Instancer: The render delegate now calculates motion blur when using the point instancer.

But does it mean it wont necessary work on changing point count on that Instancer?

Points are emitted on the screen left, translate right, then die at the screen right.

Attached hip and mov

pointMB.zipmb_2.zip

[Anonymous]

seems like its not Arnold issue. Karma does the same. Must be Solaris/USD related.

[andreskluge]

it should work in Karma, as long as you tell it to use the velocity motion blur (by adding the render geometry settings and enableing the velocity motion blur). unfortunately arnold does not have a similar option, so my guess is that velocity motion blur is not supported?

[Anonymous]

You are right, Karma gets it right once added Render Geo Settings.

What about you Arnold?

[pal.mezei · Accepted solution]

Hi!

This is something under development (some of the initial bits: https://github.com/sirpalee/arnold-usd/commit/e183b9d2d3489f4b352c0679841a56e3794a1a65). While the velocity/acceleration-based blur is trivial, the tricky parts are to access all the information from Hydra (like shutter times or fps). This is something we are still figuring out.