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Rendering with Arnold in Houdini and Solaris using the HtoA plug-in.
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USD SKELETON

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Message 1 of 13
nickwebber
545 Views, 12 Replies

USD SKELETON

I have created a crowd sim in Houdini and it renders fine with arnold/solaris. But when rendered as a procedural the characters arn't deformed.

Any ideas?

Thanks!

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12 REPLIES 12
Message 2 of 13
andreskluge
in reply to: nickwebber

not working here as well unfortunately...

Message 3 of 13
julian.hodgson
in reply to: nickwebber

Please try HtoA 5.3.0 (https://docs.arnoldrenderer.com/display/A5AFHUG/HtoA+5.3.0), as this should be fixed in usd#329.

Message 4 of 13
andreskluge
in reply to: nickwebber

yes, using htoa 5.3.0

Message 5 of 13
julian.hodgson
in reply to: nickwebber

Can you share a simple scene showing the setup you are using so we can take a look please?

Message 6 of 13
andreskluge
in reply to: nickwebber

and just like that it starts working! turns out if you are at a wrong frame, it does not give an error, but just shows all the agents in the t-pose, giving the impression that its not working.

but i wanted to clarify - is arnold able to take any advantage of the fact that i have a single agent in a crowd of 100 thats been deformed? Any sort of instanceing that can use the skeleton data to deform the same polygonal shape?

Message 7 of 13
pal.mezei
in reply to: andreskluge

Hi Andres!


There is no instancing used for crowds as of now, due to each agent potentially having a different geometry to others.

For example, when rendering inside Solaris, we receive each agent as a separate polymesh. We could potentially keep track of the geometry information, and using some smart hashes. Identifying the meshes that share the same underlying geometry, only use object space subdivision settings, no world space/instance dependent displacement and so on. For now we are not doing any of this, as it can get very complicated quickly.

Cheers,
Pal.

Message 8 of 13
andreskluge
in reply to: pal.mezei

thanks a lot for the explanation. makes sense.

Message 9 of 13
nickwebber
in reply to: andreskluge

It must be no? I had a scene with hundreds of of agents and only one frame was 10 meg

Message 10 of 13
nickwebber
in reply to: nickwebber

Ah just saw the reply.

Message 11 of 13
julian.hodgson
in reply to: nickwebber

Good to know about the frame range issue - glad it's working.


With respect to the sharing of polygon data between similar agents, we have the core ticket 7773 to look at this.


Cheers,

Julian

Message 12 of 13
nickwebber
in reply to: nickwebber

Hi how can we send a scene? Arnold crashes for me. Latest version.

Message 13 of 13
pal.mezei
in reply to: nickwebber

Please send the scene to support@arnoldrenderer.com and mention this post in the email, so we know which question the support request relates to.

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