All good, I need to fix up something here for objectID's anyway.
I'm a big fibber. I used evalDeferred (thanks to a far more savvy TD
recommending it):
import maya.cmds as cmds
import maya.mel as mel
myObj = cmds.ls (sl=True, dag=True, type='shape')
myObj = myObj[0]
idNumber = 5
for obj in myObj:
mel.eval('vray addAttributesFromGroup ' + myObj + ' vray_objectID 1')
cmds.evalDeferred(lambda object=myObj,object_id=idNumber:
cmds.setAttr(object + '.vrayObjectID', idNumber))
I used to loop over all the selected objects adding incremental ID's.
Divide by three then create that many multimattes render elements. As long
as I sorted the initial list properly (and the target's object count did
not change), I could automate matte creation in a crude fashion. Same for
Material ID's (though that tends to be tricker because of
double-sided/blend material use and the like).
On Wed, Oct 30, 2013 at 1:19 AM, johan Borgström <[email protected]>wrote:
> Hi Christopher!
>
> Thanks for your answer, I tried to use partial but got the same error, so
> If you can show how you did it that would be great.
>
> I looked through the echoed history of what happens when I manually add
> the vray material attr and found some lines of code that looked
> interesting. If I add the line "vrayAddAttr VRayMtl1 vrayMaterialId" I was
> able to set the material id without the error I described earlier.
> Hmmm, not clear what that line does ... but somehow it make Maya aware
> that the attr exists :)
>
> (Btw It looks like the line that contains "vrayAddAttr VRayMtl1
> vrayColorId" is not necessary)
>
> Br,
> johan
>
>
> mat = 'VRayMtl1'
> id = 4
> mel.eval('vray addAttributesFromGroup {0} vray_material_id 1;'.format(mat
> ))
> #mel.eval('vrayAddAttr {0} vrayColorId;'.format(mat))
> mel.eval('vrayAddAttr {0} vrayMaterialId;'.format(mat))
> cmds.setAttr (('{0}.vrayMaterialId'.format(mat)), id)
>
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--
----
Christopher Stewart
Vancouver, BC
3D TD | VFX IT
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