[ quesa-Bugs-902920 ] Set usage array for built-in attributes

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Bugs item #902920, was opened at 2004-02-23 19:38
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Dair Grant (grantd)
Assigned to: Nobody/Anonymous (nobody)
Summary: Set usage array for built-in attributes

Initial Comment:
The interactive renderer will honour the TriMesh use array for any 
attribute type, so the geometries which can generate partially-
present attributes (e.g., TriMesh, Polyhderon, or the Tessellator) 
should also generate a usage array.

At present they put some dummy values into the attribute value 
array, but this means that attributes won't be inherited correctly 
during rendering - the usage array would let the real values to be 
picked up from the enclosing group.

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