How can I use the previous frame out as this frame's input texture

Questions
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Hi, i’m implement some temporal effects using babylon.js. ‘temporal’ mean I need the framebuffer of previous frame as the input texture to this frames. I know that in the same frame we can use the framebuffer of previous pass as the input texture to the next shading pass. But how can i use the framebuffer data between frames, thanks!

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Hello you have to use a postProcess for that: the PassPostProcess

This PP will do nothing but capture the current frame: https://www.babylonjs-playground.com/#18QHZC#2

You can then use the postprocess like a texture (with postProcess.inputTexture)

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Will this method copy the data back to cpu for reuse? Or it is on gpu.

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All in the GPU