How to Preserve Base Color of Non-Node Materials When Converting to Node-Based Materials?

Question

I have dozens of objects (all curves, not meshes) imported with their own material and Base Color defined. I need to use nodes, but when I do, the Base Color changes to white, ignoring the color of the non-node material.

How do I keep the Base Color of a material WITHOUT node in the Base color when converting to a material WITH node?

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Answer 1

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I managed to find a solution. I asked ChatGPT to create the script.

import bpy

# Iterate through selected objects
selected_objects = bpy.context.selected_objects
for obj in selected_objects:
    if obj.type in ['CURVE', 'MESH']:
        # Check if the object has a material
        if len(obj.data.materials) > 0:
            material = obj.data.materials[0]  # Assuming only one material is assigned
            
            # Create a new material with nodes
            material.use_nodes = True
            material.node_tree.nodes.clear()  # Clear existing nodes
            
            # Create the principled BSDF node
            principled_node = material.node_tree.nodes.new('ShaderNodeBsdfPrincipled')
            principled_node.location = (0, 0)  # Set the location of the node
            
            # Retrieve the base color from the original material
            base_color = material.diffuse_color[:3]  # Extract RGB components
            
            # Set the base color in the principled BSDF node
            principled_node.inputs['Base Color'].default_value = (*base_color, 1)
            
            # Create the output node
            output_node = material.node_tree.nodes.new('ShaderNodeOutputMaterial')
            output_node.location = (400, 0)  # Set the location of the node
            
            # Connect the principled BSDF node to the output node
            material.node_tree.links.new(principled_node.outputs['BSDF'], output_node.inputs['Surface'])