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Hi Riccardo, you can discuss it here.
Hi Lee, the issue I am referring is reported here : https://answers.arnoldrenderer.com/questions/30432/rendering-sand-based-texture.html?childToView=304....
Now I resolved the problem with the film grain - with lock sampling feature - but it looks like the texture does not stuck with the surface... when the camera moves, the texture looks like not moving in synchro with the surface