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Rendering is the process of converting a 3D scene into a final output, such as an image or movie. It involves simulating light, applying materials, and calculating visual effects to produce the desired result. If your question pertains to a specific render engine, please use its respective tag (cycles, eevee, blender-internal, etc).

14 votes

How to use an object as a mask?

You can do this using the Object ID and a ID mask node. Select the object you want to use as a mask, and under the object tab in the properties set the Pass Index unequal 0 (I used 1, but if you ha …
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