OTOY Forums

hey,

points with frame to frame variant ptnum, but existing velocity attribute, crash, wont or render long streaks. (reaching from point position to worldspace orgin)
I am trying to render instances with popdop points as sources.
It seems that octane tries to render "exact motion blur" by interpolating between this and last frame. which in that case wont work cause of the variant ptnum.
I have consistent id attributes, but am afraid that octane just taking ptnum in consideration.

thanks
sebastian

Can you send to me a sample scene?

-Juanjo

here we go https://drive.google.com/file/d/0B5cLxJ ... sp=sharing
that cache is straight out of pop dops. you can clearly see that ptnum is changing every frame, due the way the pops were set up.
thanks for looking into it.

sebastian

Thanks, I will check it as soon as possible.

-Juanjo

Yes, I think that I can see the MB issue here. I am investigating the cause of the problem.

-Juanjo

much appreciated

Yes, you are right. Currently the instancing motion evaluation functions don't support particle systems with variant ptnum OBJ sequences. I am going to add a new function to support instancing motion blur computing the motion from the base frame particle matrix transformation and the "v" parameter information, in only one pass.

I hope to have this function ready for the next beta build.

Thanks for reporting this problem.

-Juanjo

Done, available in the next build

New parameter "Instancing MB computed from velocity attribute" in the Octane OBJ custom spare parameters. Can be enabled in the OBJ instance nodes to compute the instances motion blur using the "v" velocity attribute. Useful when instancing over particle system or other OBJ nodes with variable ptnum IDs, or when only the instances translation motion blur is useful in the scene.

-Juanjo

Your scene rendered with the new MB.

[vimeo]http://www.vimeo.com/135378952[/vimeo]

-Juanjo

good work!