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Thanks @JohnK for reply.

yes I saw this tutorial, But the application I build will receive many models from the users so I can't modify the texture, I just need to color the backface with a color not applying texture to it.

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If you're ok using BABYLON.CustomMaterial, you can do this like so:

http://www.babylonjs-playground.com/#PMVQPJ#3

It's probably a bit faster doing the dot product in the vertex shader though:

http://www.babylonjs-playground.com/#PMVQPJ#4

You would probably want to pass in the desired color as a uniform instead of hard coding it.

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