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How can you find out a shader you need as there are hundreds of materials in your scene? Well,you can try this mel! First,you need to name your shader as :
then source and run this mel with "materialGrop();" on command line,it can division these shader according to their names.a popMenu will appear when you select a radioButton and right click on it.
Please use (and modify) this at your own lisk.
notice:this mel is only for maya 4.5! A example scene with it.