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Deferred Renderer Reuse GBuffer for Passes

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I'm adding planar reflection support to my deferred renderer. At first I was going to create a set of GBuffers for the reflection map (matching dimensions), but this makes the reflection map very memory expensive. So I was thinking to just reuse my main screen gbuffer, but only render to a part of it (using viewport). Is there any reason not to do it this way?

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Is there any reason not to do it this way?

No, reusing buffers is the way to go, just take care, that you don't need the content of the buffer in a later pass.

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