[python scripting] adding shader attributes in python

[Jérémy Ringard]

Hi,

I'm trying to add custom shader attributes on all my char meshes but it doesn't seem to work

My sourcepath is a gcha file with skeleton and meshes.

before adding any attribute, I'm already stuck at the point of adding a shadingGroup node on the meshes.

I guess I'm not using the function correctly. To be honnest I find the syntax a bit confusing :)

#retrieve the list of geometry nodes 

nodelist = cmds.glmCharacterMaker(script=True, 

                        file=sourcepath, 

                        listGeoNodes = True)

#adding shading group on each

for node in nodelist:

    if 'gmsh' in node:

        addednode = cmds.glmCharacterMaker(script=True, 

                        file=sourcepath, 

                        addGeoNode=["ShadingGroupNode", "testnode"], 

                        outputFile=saveAs)

        cmds.glmCharacterMaker(script=True, 

                        file=saveAs, 

                        editProperties=["ShadingGroupNode", addednode, 'parent='+node], 

                        outputFile=saveAs)

 

when I open the "saveAs" file, I can't see any change

Am I missing something ?

(I'm using V7.3.5 on maya 19 linux)

thanks !

[Nicolas Chaverou]

Hey Jeremy,

When creating a new node in a Character File, it is discarded when the file is saved if it is not connected to the main graph.

Thus you need to merge your two commands in one.

Here's an example below:

import maya.cmds as cmds
inCharFile = 'D:/testChar.gcha'
outCharFile = 'D:/testCharOut.gcha'

cmds.glmCharacterMaker(script=True, file=inCharFile,
                        addGeoNode=['ShaderAttributeNode', 'myAttrNode'],
                        editProperties=['ShaderAttributeNode', 'myAttrNode', 'parent=myShadingGroup'],
                        outputFile=outCharFile);

And the before / after in the Character File

Hope that helps

Best,

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[Jérémy Ringard]

it works like a charm, thank you Nico !

one last thing: I'm trying to add a string attribute on each mesh. Aparently the attribute name is related to the name of the ShaderAttr node. Does that mean I can't have the same attribute with a different value for each geometry?

Le mercredi 3 février 2021 05:11:08 UTC-5, nicolas.chaverou a écrit :

Hey Jeremy,

When creating a new node in a Character File, it is discarded when the file is saved if it is not connected to the main graph.

Thus you need to merge your two commands in one.

Here's an example below:

import maya.cmds as cmds
inCharFile = 'D:/testChar.gcha'
outCharFile = 'D:/testCharOut.gcha'

cmds.glmCharacterMaker(script=True, file=inCharFile,
                        addGeoNode=['ShaderAttributeNode', 'myAttrNode'],
                        editProperties=['ShaderAttributeNode', 'myAttrNode', 'parent=myShadingGroup'],
                        outputFile=outCharFile);

And the before / after in the Character File

Hope that helps

Best,

---

 
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http://www.golaem.com

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[Nicolas Chaverou]

Hey there,

See inlined below:

On Thu, Feb 4, 2021 at 7:41 AM Jérémy Ringard <jeremy....@gmail.com> wrote:

it works like a charm, thank you Nico !

one last thing: I'm trying to add a string attribute on each mesh. Aparently the attribute name is related to the name of the ShaderAttr node. Does that mean I can't have the same attribute with a different value for each geometry?

Yes that's correct : Shading Attribute Node have unique names in the Character File

Are you string to add the same Shading Attribute to all meshes but with different values? or with the same value?

Can you describe what's the use case?

Best,