Set VERTEXCOLOR in PaintTool

randymills

I'm working on a python script that will assign vertex color tags with random colors to each mesh in my object to prep my models for working in Substance Painter. I have a sample script that is getting me close to what I need, but I can't for the life of me figure out what I'm doing wrong with the c4d.DescID(c4d.DescLevel) setup. I continue to get the following error, which suggests the DescLevel is reading c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR, c4d.DTYPE_VECTOR as an integer, even though I'm defining it as a vector (unless I'm misinterpreting this):

Traceback (most recent call last):
  File "scriptmanager", line 43, in <module>
  File "scriptmanager", line 22, in main
TypeError: 'c4d.Vector' object cannot be interpreted as an integer

Current code sample (simplified but w/ test code included to show what I've tried already):

import c4d

doc: c4d.documents.BaseDocument  # The currently active document.
op: c4d.BaseObject | None  # The primary selected object in `doc`. Can be `None`.

def main() -> None:
    if op is None:
        raise RuntimeError("No object selected")
    
    c4d.CallCommand(431000045) # Create Vertex Color Tag

    doc.SetAction(1021286)  #Makes the paint tool active  
    tool = doc.GetAction()  
    tool = c4d.plugins.FindPlugin(tool, c4d.PLUGINTYPE_TOOL)
    if not tool:
        print("Vertex Paint tool not found!")
        return False
    # Set the vertex color parameter
    myVertexColor = c4d.Vector(0.0,1.0,0.0) # Green
    # myVertexColor = c4d.DescLevel(c4d.Vector(0.0,1.0,0.0)) # Green
    
    desc_level = c4d.DescLevel(c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR, c4d.DTYPE_VECTOR, 0)
    # Debug: Verify the DescID
    print(f"DescID: {desc_level}")
    vertexColorSuccess = tool.SetParameter(desc_level, myVertexColor)
    if not vertexColorSuccess:
        print("Failed to set vertex color parameter!")
        return False
    # Debug: Verify the parameter was set
    current_value = tool.GetParameter(desc_level, c4d.DESCFLAGS_GET_0)
    print(f"Set color: {current_value}")
    
    # tool[c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR]=myVertexColor
    # myVertexColorTag = c4d.DescID(c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR, c4d.DTYPE_VECTOR, 0)
    # tool.SetParameter(myVertexColorTag, myVertexColor, c4d.DESCFLAGS_SET_0)
    c4d.CallButton(tool, c4d.ID_CA_PAINT_TOOL_APPLY_ALL) # Applies the color to all vertices
    c4d.EventAdd()
if __name__ == '__main__':
    main()

Am I thinking about this all wrong...should I be accessing/setting the vertex color a different way?

m_adam

Hey @randymills Python provide helper to directly call SetParameter on the correct parameter just with the integer value.
With that's said internally we construct a DescID which is constructed from one or multiples DescLevel. SetParameter usually only deal DescID, since only DescID are able to identify a given parameter.

With that's said here is you code working as expected demonstrating you both way.

import c4d

doc: c4d.documents.BaseDocument  # The currently active document.
op: c4d.BaseObject | None  # The primary selected object in `doc`. Can be `None`.

def main() -> None:
    if op is None:
        raise RuntimeError("No object selected")
    
    c4d.CallCommand(431000045) # Create Vertex Color Tag

    doc.SetAction(1021286)  #Makes the paint tool active  
    tool = doc.GetAction()  
    tool = c4d.plugins.FindPlugin(tool, c4d.PLUGINTYPE_TOOL)
    if not tool:
        print("Vertex Paint tool not found!")
        return False
    
        
    # Use SetParameter directly
    if True:
        myVertexColor = c4d.Vector(0.0,1.0,0.0) # Green
        
        vertexColorSuccess = tool.SetParameter(c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR, myVertexColor, c4d.DESCFLAGS_SET_NONE)
        if not vertexColorSuccess:
            print("Failed to set vertex color parameter!")
            return False
        
        # Debug: Verify the parameter was set
        current_value = tool.GetParameter(c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR, c4d.DESCFLAGS_GET_NONE)
        print(f"Set color: {current_value}")
    
    
          
    
    # Use DescID and DescLevel
    if True:
        myVertexColor = c4d.Vector(1.0,0.0,0.0) # Red
        descLevel = c4d.DescID(c4d.DescLevel(c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR, c4d.DTYPE_VECTOR, 0)) 
        vertexColorSuccess = tool.SetParameter(descLevel, myVertexColor, c4d.DESCFLAGS_SET_NONE)
        if not vertexColorSuccess:
            print("Failed to set vertex color parameter!")
            return False
        
        # Debug: Verify the parameter was set
        current_value = tool.GetParameter(descLevel, c4d.DESCFLAGS_GET_NONE)
        print(f"Set color: {current_value}")
    
    
        desc_level = c4d.DescID(c4d.DescLevel(c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR, c4d.DTYPE_VECTOR, 0))    
    
    # tool[c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR]=myVertexColor
    # myVertexColorTag = c4d.DescID(c4d.ID_CA_PAINT_TOOL_VERTEXCOLOR, c4d.DTYPE_VECTOR, 0)
    # tool.SetParameter(myVertexColorTag, myVertexColor, c4d.DESCFLAGS_SET_0)
    c4d.CallButton(tool, c4d.ID_CA_PAINT_TOOL_APPLY_ALL) # Applies the color to all vertices
    c4d.EventAdd()
if __name__ == '__main__':
    main()

Cheers,
Maxime.

randymills

@m_adam Thank you so much for the help, that works perfectly and thank you for showing me both methods, that's very helpful and appreciated!