This question already has an answer here:
Is there a way to "record" the display of a camera instead of rendering it on screen?
For example, if I want to stream a camera's frame block to an external application.
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marked as duplicate by Alexandre Vaillancourt♦, Kromster, Community♦ Oct 28 '16 at 16:30
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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This feature is also called Render-to-texture, or FBO rendering.
You can check how to do it on Unity here: https://docs.unity3d.com/Manual/class-RenderTexture.html
