Variable amount of properties determined at runtime

Coding Python Support
4

Perhaps I’m misunderstanding but it sounds as though

the object already has materials applied and you just don’t know how many prior to loading a specific object.

You shouldn’t need additional properties for this. Granted the below is specifically looking for a principled bsdf shader and adjusting the default base color; but the concept of accessing the active objects material properties remains the same.

object material colors

import bpy


class TESTADDON_PT_Main(bpy.types.Panel):
    bl_idname = "TESTADDON_PT_Main"
    bl_label = "Test Addon"
    bl_space_type = "VIEW_3D"
    bl_region_type = "UI"
    bl_category = "Test"

    def draw(self, context):
        layout = self.layout
        col = layout.column(align=True)
        if context.object and context.object.material_slots:
            obj = context.object
            obj_mats = [m.material for m in obj.material_slots]
            for mat in obj_mats:
                if mat and mat.use_nodes:
                    bsdf = mat.node_tree.nodes.get("Principled BSDF")
                    row = col.row(align=True)
                    row.prop(bsdf.inputs['Base Color'],
                        "default_value",
                        text=mat.name)


def register():
    bpy.utils.register_class(TESTADDON_PT_Main)


def unregister():
    bpy.utils.unregister_class(TESTADDON_PT_Main)

if __name__ == "__main__":
    register()
3 Likes