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I was wondering if anyone knew how to render multiple frames from a camera or texture to a buffer in Unity and to then blend them together? Is this possible? If so how would I go about doing so in Unity?

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The Image Effects source code should give you a good idea how to render into a render target. You can import the package and look through the source code to get an idea of how they happen.

The basics are:

  • render a quad that covers the full size of the render target
  • the shader does the blending you're talking about by using the previous render target texture(s) as input
  • the output goes into a new render target, which can then be used as input for the next
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