Create Materials with Checkerboard shader for Selected Objects

Create Materials for Selected Objects.py

import c4d
from c4d import gui
from random import randint

# Welcome to the world of Python
# Author: Mike Udin, 
# Tutorial here http://mikeudin.net/?p=2915
# 2016

def randomColor(x,y):
    r = randint(x,y) / 256.0
    g = randint(x,y) / 256.0
    b = randint(x,y) / 256.0
    return c4d.Vector(r, g, b)

def editMaterial(mat):
    #mat[c4d.MATERIAL_COLOR_COLOR] = randomColor()
    shader = c4d.BaseShader(c4d.Xcheckerboard)
    mat[c4d.MATERIAL_COLOR_SHADER] = shader
    shader[c4d.CHECKERBOARDSHADER_COLOR1] = randomColor(0,126)
    shader[c4d.CHECKERBOARDSHADER_COLOR2] = randomColor(126,255)
    mat.InsertShader(shader)

def main():
    objs = doc.GetActiveObjects(1)
    if not objs:
        gui.MessageDialog('No selected objects!')
        return
    doc.StartUndo()
    for obj in objs:
        tag = obj.GetTag(c4d.Ttexture)
        if tag == None:
            tag = obj.MakeTag(c4d.Ttexture)
            doc.AddUndo(c4d.UNDOTYPE_NEW,tag)
        if not tag.GetMaterial():
            mat_name = obj.GetName() + ' material'
            mat = doc.SearchMaterial(mat_name)
            if mat == None:
                mat = c4d.Material(c4d.Mbase)
                mat.SetName(mat_name)
                editMaterial(mat)
                doc.InsertMaterial(mat)
                doc.AddUndo(c4d.UNDOTYPE_NEW,mat)
            tag.SetMaterial(mat)
                        
    doc.EndUndo()
    c4d.EventAdd()
if __name__=='__main__':
    main()