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Is there a way to save the current frame without rendering the hole thing again?

Is there any way to save the current frame (without UI would be nice) without rerendering everything? I need to make a custom glass material (with fake refraction) for mobile and I wand to use the last rendered frame as albedo mapped in screen space to which I can apply some distort and other transformations. It would also be nice if I could sample a certain mip from that rendered frame to simulate a blurry refraction. It is basically an emissive material with the emissive texture mapped in screen space. Something like this photoshop fake:

This would be really nice and cheap (performance-wise).

Product Version: UE 4.10
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asked Jan 15 '16 at 04:49 PM in Rendering

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avatar image ConcreteGames Jun 23 '17 at 07:40 AM

I'd be interested in that too!

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