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Nicholas Webber avatar image
Nicholas Webber asked ·

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!

usd
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Nicholas Webber avatar image
Nicholas Webber answered ·

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

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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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Julian Hodgson avatar image
Julian Hodgson answered ·

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

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Andres Kluge avatar image
Andres Kluge answered ·

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?

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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.

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thanks a lot for the explanation. makes sense.

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

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Ah just saw the reply.

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Julian Hodgson avatar image
Julian Hodgson answered ·

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

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Andres Kluge avatar image
Andres Kluge answered ·

yes, using htoa 5.3.0

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Julian Hodgson avatar image
Julian Hodgson answered ·

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

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Andres Kluge answered ·

not working here as well unfortunately...

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