Blender Material Color in Mitsuba (or any other) Shader

Question

I have imported a large WRL file (contains >3000 parts) with colors included (one material for each part!). In Cycles and Blender-Render, the colors are rendered just fine.

But what do I do if I want Mitsuba, Luxrender or Yafaray as renderer? Is there a way to get the Blender-material-color and put that in a 3rd-party material?

I know how to make a material with python and apply it to a mesh. But how do I get the color of the selected object's blender-material?

How to make a Mitsuba, Luxrender or Yafaray matrial is one thing I yet have to find out too.

Thanks for your help.

Answer 1

You can read the mat color from Blender Internal material like so:

# from material
mat = bpy.data.materials['Material_Name']
color = mat.diffuse_color

# or from object
ob = bpy.context.active_object
if len(ob.data.materials):
    # get 1st material slots material
    mat = ob.data.materials[0]
else:
    # no slots
    print("No Material")
    mat = None
if mat:
    color = mat.diffuse_color

To change LuxRenders material diffuse color:

mat.luxrender_material.luxrender_mat_matte.Kd_color = color

Mitsuba:

mat.mitsuba_material.mitsuba_bsdf_diffuse.reflectance_color = color

In Yafaray there is no need to change anything, it will use:

mat.diffuse_color

Answer 2

Here we go! After a few tries it works!

import bpy

if bpy.context.selected_objects != []:
    for ob in bpy.context.selected_objects:
        if ob.type == 'MESH':
            objcolor = ob.active_material.diffuse_color
            ob.active_material.mitsuba_material.mitsuba_bsdf_diffuse.reflectance_color = objcolor
            ob.active_material.luxrender_material.luxrender_mat_matte.Kd_color = objcolor

This is it! Select all objects and run this script. The diffuse color will be added to Mitsuba and Luxrenderer.