different OP “merging” a card in 3d-space

i have a 3d-comp with several cards, partially with semitransparent imgs, one card covering the next one behind it…
i want some of those cards to behave e.g. like a screen or plus operation to the rest, sort of like the normal 2D-merge-node-operations offer (screen, plus, mult etc.)

till now i take a seperate scanline-renderer for that card and merge the result to the rest with a normal merge node an its according merge operation.

does anyone know a way to do it without a seperate scanline-renderer but with some of the possible merge operations a merge has?

thanks

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