try this :
import maya.cmds as mc
import maya.mel as mel
for s in mc.ls( sl=1 , type='VRayMtl' ):
mel.eval('string $s = "%s";' % s)
mel.eval( "vray addAttributesFromGroup $s vray_material_id 1" )
cheers,
Raphael
2013/10/14 shapeofmotion <jo...@petfactory.se>
> Hi!
>
> Does anyone know how to add a vray material id attribute to a material
> with python or pymel?
>
> best regards
> # J
>
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