Can't figure out inverse of get world coords function for isometric game?

I don't understand your WrappingMod function. You seem to calculate the screen coordinate, and then take it modulo viewport dimension (twice) just for the hell of it. That makes your world->screen mapping non-bijective, so it has no inverse.

You need two matrices: one to convert from view to world coordinates, and its inverse to convert the other way.

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