jgbpy_randomColorFacesForQuadMesh.py

'''
    NOTE: The Script only works on surface with Quads Faces ONLY
'''

import bpy
from random import *

# Get selected objects
selected_objects = bpy.context.selected_objects

# Create a single Material that respect Vertex Color
mat = bpy.data.materials.new('VertexMat')
mat.use_vertex_color_paint = True
mat.use_vertex_color_light = True

for object in selected_objects:  
    
    # Get Mesh Data instead of Objects
    mesh = object.data
    object.data.materials.append(mat)

    print('-'*5, ' START ','-'*5 )
    
    # Create new 'Col' Vertex Color Layer
    mesh.vertex_colors.new()
    
    # Vertex colour data
    vertexColour = mesh.vertex_colors[0].data
    faces = mesh.polygons
    
    # Create random vertex colours
    vColour = [(random(),random(),random()) for i in mesh.vertices]
    
    #print(len(vColour))
    #print(vColour)
    
    #print(len(vertexColour))g
    
    #vertexColour[2].color = 1,1,1
    #vertexColour[6].color = 1,1,1
    #vertexColour[7].color = 1,1,1
    #vertexColour[3].color = 1,1,1
    
    # asign colours to verts
    for i in range(len(faces)):
        v = vertexColour[i] 
        f = faces[i].vertices
        
        print(f[0])
        print(f[1])
        print(f[2])
        print(f[3])
        
        print(vColour[i])
        
        vertexColour[i*4 + 0].color = vColour[i]
        vertexColour[i*4 + 1].color = vColour[i]
        vertexColour[i*4 + 2].color = vColour[i]
        vertexColour[i*4 + 3].color = vColour[i]
       
       
    print('-'*5, ' END ','-'*5 )