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re-editing material usd once made into a usd April 2, 2020, 11:50 a.m.

That's correct. At the moment, it only works on simple networks.

Simple GLSL Shader Example? March 27, 2020, 11:12 a.m.

The default GLSL shader produced with the steps listed in the second link you provided (https://www.sidefx.com/docs/houdini/shade/glsl.html) seems to work for me.

I tweaked the fragment shader to set the diffuse color to green, and the sphere appears green in the viewport. See attached.

Can't get RfH 22.3 for H18 rendering... March 25, 2020, 2:12 p.m.

IIRC, the “pxrmaterialbuilder” VOP is implemented in C++ in RfH. The traceback indicates that this VOP is not available. So most likely there is binary incompatibility between the installed RfH and H18.0.287.

There was a similar post about such incompatibility here:
https://www.sidefx.com/forum/topic/72221/ [www.sidefx.com]

Actually, I just checked RMan's support page:
https://rmanwiki.pixar.com/display/RFH23/Installation+of+RenderMan+for+Houdini [rmanwiki.pixar.com]

It states that RenderMan 23.2 is compatible only with H18.0.391. So you will need to install a newer version of Houdini.