Re: materials in Performer 2.0

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Angus Dorbie (dorbie++at++plague.reading.sgi.com)
Thu, 15 Jun 1995 21:23:47 +0100

> Will Performer 2.0 allow for different material properties
> in triangular meshes? I.e., can one vertex be on type 1
> material and another vertex be of type 2 material? It seems
> like this would be a really great feature to have...

The binding of a material is fairly expensive making this an unplesant
prospect, but some of the functionality you require exists at the moment.
You can modify a selected material property on a per vertex basis. Simply
make set the performer material mode to the material component you want
to modify by calling:

pfMtlColorMode()

and add colour per vertex information to your geosets, for example to modify
material diffuse (& alpha)per vertex call:

pfMtlColorMode(perf_mat, PFMTL_BOTH, PFMTL_DIFFUSE);

-- 
Angus Dorbie,
The Reality Centre,
Silicon Graphics Ltd, UK
dorbie++at++reading.sgi.com

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