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HELP: combining "decals" with alpha in compositor (sopuli.xyz)

submitted 4 months ago by [email protected] to c/blender

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So, the thing I want to accomplish is to add .png images, compile them and then transform the compiled montrosity (move/scale, etc).

But the thing is, if I “alphaover” the images with some offset, for example:

the image laid over the other cuts off, as the overlay can’t reach outside the dimensions of the underlaying one.

I know I can just:

use eg. gimp and combine the images there, but I’d rather have my workflow entirely in blender.
add transparent padding for ~billion pixels around the decal as a workaround, but that sounds silly and “bruteforcing” the concept.

How would I go about getting all overlaid images to display in full in such case? I’ve tried different options on the “alpha over” and “color mix” -nodes without results, but entirely possible that I just missed some critical combination.

So, thoughts?

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[–] [email protected] 2 points 3 months ago* (last edited 3 months ago)

weird, yesterday I couldn't get it to work with generated 4k x 4k square of just alpha, but today it does work a charm. Must have been tired and derped something fierce.

Eitherway, so far, as far as jank solutions go, it seems to be the least jank. Thanks.