I learned this in a class last year, and I cannot for the life of me remember the term for it. For example, if I wanted to make a rock, with a rocklike texture, aside from hand painting it, an option would be to find a rocky "texture" online, paint a black blob in the shape of the rock on its own layer, and then I somehow could place that texture only onto the object, and move it around to where I wanted it. What's the name of the technique? Could somebody explain a quick way to do this in photoshop?
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