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How to get the "background" texture w.r.t. a sprite ?


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Let's say one has a sprite representing a fire, and wants to create a heat effect above it.
To do so in a shader, one needs access to the "background" pixels in order to warp them.

We could use RenderTexture, but in this case we would need to keep a list of already drawn
components which is not convinient.

I am wondering how we could do that properly using pixi ?




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I have that hack for v4:



requirement: have a renderTexture or filter at background. For example, a fullscreen AlphaFilter, otherwise there's no way to get backdrop data.

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