UNSOLVED Editing RS Nodes with Python


i have been wrapping my head around it, but I cannot find anything. Or maybe I am thinking the wrong way.

What i want it to get selected Nodes out of my RS Material to edit the Parameters. But I cannot find anything in the SDK. Could not get anything out of the GvNode.

What I would like the script to do:

I want to select texture Nodes in my Materials and the script will change the color space to file-IO -> RAW

Thanks and happy holidays 🦌

Hi @cgweasel, to retrieve the selected node, like all BaseList2D (BaseOject,BaseTag,BaseMaterial, etc...) you can know there selection state with the method node.GetBit(c4d.BIT_ACTIVE).

So find bellow the complete code to do what you want:

import c4d

def main():
    # Checks if selected material is valid
    mat = doc.GetActiveMaterial()
    if not mat or not mat.CheckType(1036224) :
        raise ValueError("There is no xpresso redshift material selected")
    # Retrieve the output nodes, which is also the first node in the node hierarchy. 
    # Therefor we can iterate them as usual BaseList2D
    node = mat[c4d.REDSHIFT_GRAPH_NODES]
    while node:
        # Check if this is a texture node and its selected
        if node[c4d.GV_REDSHIFT_SHADER_META_CLASSNAME] == 'TextureSampler' and node.GetBit(c4d.BIT_ACTIVE):
            # Set to Raw, to know the Id and the value I left click on the Filename parameter, User Interface -> Show SubChannel
            # Then I dragged the ColorSpace parameter to the python console
        node = node.GetNext()


if __name__=='__main__':


Hi Maxime,

thank you very much. On a Xpresso Material, this works just fine. Unfortunately, I only use Node Materials. I know the type of those Materials is 5703, but it seems that everything else is not responding to nodes.

Thanks for the tipp with the sub-channels. Awesome. But this also does not work with nodes 😞

Hi @cgweasel hope you had a nice Christmas time 🙂

Regarding your question, this has been answered in this post Change the ColorSpace of Redshift Texture Node?
Then you can find example about nodes graph in our GitHub repository, And I would advice you to look at modify_port_value.

I think with that you have all the information needed to make it work, if you struggle please let me know and I will be happy to help you. For the future please specify which node system you are using, since you mentioned GvNode I guessed that you used xpresso.