Forums Solaris and Karma Can a pre-frame script edit the render settings?

Can a pre-frame script edit the render settings?

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m-cg
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In the same vein as https://www.sidefx.com/forum/topic/81229 [www.sidefx.com]
I have a preframe script that does a frame substitution on an attribute value but it's not being saved after the script is run.

Part of the USD file being rendered:
custom string ri:samplefilter0:name = "PxrCryptomatte"
custom string ri:samplefilter0:PxrCryptomatte:filename = "/path/to/render/dir/cryptomatte/renderproduct.cryptomatte.$F.exr"

I'm attempting to replace $F with the current frame from hou.frame() but the cryptomatte exr is still being written out with $F in it instead of the actual frame number.
I've confirmed the attribute value is being set on the stage by getting the attribute again and printing it.

Any help please?

Thanks
Michael
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m-cg
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Related question on why I'm running the preframe script: https://www.sidefx.com/forum/topic/82522/ [www.sidefx.com]
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jason_iversen
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Yes, I believe it can.
Jason Iversen, Technology Supervisor & FX Pipeline/R+D Lead @ Weta FX
also, http://www.odforce.net [www.odforce.net]
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