render COP to read output from Karma ROP?

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I was experimenting with live compositing workflows with Solaris and COPs, and curious to know if it is, or should be, possible to get the output from a USD Render ROP into a COP network using the render COP.

When I tested that workflow, I got this error:

Error 
No output driver. 
Error 
The rendered file could not be read. 
Error 
Invalid output driver: composite, geometry and OpenGL renders not supported. 
Error 
-- Too many errors, additional errors were suppressed. --

Not sure if I'm using the wrong node(s), or if this feature/workflow has not been implemented.
Edited by nascentparadigm - Feb. 13, 2020 15:27:40
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I don't think so, the Render COP requires a SOHO-style ROP. It'd have to modified to support other ROP types. All it does is to redirect the filename (the Render COP is really just a button-presser followed by a file load).
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