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Multipass calculations?


hoknamahn

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Is it real to calculate a pixel color (surface shader) on the basis of other pixels (even if those yet are not calculated)?

A surface shader doesn't really know anything about pixels. The most you can say is that it knows about how some variables change over an area that may project to somewhere in the neighborhood of a pixel in size (in raster space), but usually considerably less.

Building an image filter as a surface shader, for example, wouldn't be a very good idea.

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