Published 2 Aug 2025

Make `color_tag` writable for Custom Nodes

Im writing a addon for blender, and created lots of custom shader nodes based on ShaderNodeCustomGroup .

Now I wanted to change the title colors for clarity, like it’s possible for node-groups with color-tag.

But if i try this:

class MyNode(bpy.types.ShaderNodeCustomGroup):
    bl_idname = f"MyNode"
    bl_label = "BNG Image Texture"
    bl_icon = 'TEXTURE'

    def init(self, context):
        self.color_tag = "SHADER"

I get: AttributeError: bpy_struct: attribute "color_tag" from "MyNode" is read-only

So, I’m stuck with the default INPUT value of color_tag , and it’s really hurting readability.

It would be great if that could be changed ^^

100%

Development Status: Open

paul-hirch

2 Aug 2025

1 Comment

samueloates 19 Dec 2025

It would make more sense to have a different color tag for each node type, rather that for each node individually, but either way would still work. If you want to know more of what I mean, check for 'Different Python Classes for Custom Node Color Tag', in the Scripting category. For now, the standard way of using color identification on custom nodes is to change the node body color. This is enabled using bpy.types.Node.use_custom_color, and the color is changed using bpy.types.Node.color, which takes values like this: (1.0, 0.5, 0)