Forums Solaris and Karma Authoring USD primvars of boolean type using Vex

Authoring USD primvars of boolean type using Vex

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Tim Crowson
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What is the proper way to author bool-type USD primvars using an AttributeWrangle LOP. For example, and this is hypothetical, if we to set an object to render as a Matte object in Karma, using a RenderGeometrySettings LOP generates the following on the prim:

primvars:karma:object:ismatte    bool[1]:[True]

I'm trying to figure out how I can set this using Vex instead. Bumping on the data type though. Can't figure out how to set a (USD) Boolean in Vex.
Edited by Tim Crowson - May 25, 2022 15:32:05
- Tim Crowson
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Hamilton Meathouse
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usd_addprimvar(0, "/sphere1", "bool_primvar", "bool[]");
int myindex[];
append(myindex,0);
usd_setprimvar(0, "/sphere1", "bool_primvar", myindex);
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tamte
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you may be talking about 18.5 since you are still mentioning bool primvars:karma:object:ismatte (since 19.0 uses int primvars:karma:object:holdoutmode)

but in 19.0, you can bind bool properties as int
you can just do
i@mybool = 1;
and in Binding tab, add a new binding, set type to bool, VEX Parameter to: mybool, and Attribute name to the name of property or primvar you want to create or edit
Tomas Slancik
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Method Studios, NY
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