RenderMan & RISpec, MTOR not copying some parameters

comp.graphics.rendering.renderman - RenderMan interface & shading language.


RenderMan & RISpec >> MTOR not copying some parameters

by thad beier » Wed, 15 Jun 2005 06:35:55 GMT

I'm at my wits end, and I was hoping that somebody might have seen this
before.

We are doing very straightforward work with Maya, MTOR, and RenderMan.
For some reason, for some of our shaders, some of the time, a few of
the parameters do not get copied into the RIB files correctly.

When running mtor_maya5 explicitly from the shell the erros is
repeatable. Using the mondo shader in the rat library, the abColorMap
parameter is never copied into the rib. The abDiffuseMap parameter, on
the other hand, does appear to be copied correctly every time.

There are no error messages that I can see. All files exist that
should exist, and if I hand-patch the RIB file the images render
correctly.

As I said, I'm at my wits end. If anybody has seen anything like this,
I'd love to hear about it.

Thad Beier
Hammerhead Productions

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RenderMan & RISpec >> MTOR not copying some parameters

by Dave Nunez » Thu, 16 Jun 2005 10:37:35 GMT


Hi Thad, is the value of the parameter not being copied (ie, the string
pointing to your textures) ?or the parameter in general (abColorMap) ?

Dave
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RenderMan & RISpec >> MTOR not copying some parameters

by thadbeier@gmail.com » Tue, 21 Jun 2005 15:15:48 GMT

I was using the Mondo shader. When running mtor_maya5 to generate a
rib, the abSpecular and abDoDisplacement parameters were not being
copied to the rib file. If there were multiple Mondo shaders,
different parameters would be left out. It was a mess.

Apparently it is a bug in rat-5.5.1 that is fixed in more recent rat
versions. We're upgrading to those, and it appears that it works
perfectly.

Various and sundry workarounds were attempted, but in the end it was
cheaper and more reliable to just get the version that works.

Thad Beier
Hammerhead Productions
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