How is this achieved when sculpting terrain

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In this video the person uses their brush and as it sculpts some areas are rock and others remain as sand. Is there a tutorial someone could show me or a brief explanation of how to set it up. I am not exactly sure how to phrase my question or query :slight_smile:

Thanks

Take a look at the vehicle demo which you can find in the marketplace :slight_smile: -> there you can find such a material