I wanted to use flowmap texture for direction / rotation of instances generated by geometry nodes.
I saw quite nice explanation of basics behind, but ... it says in one part - pure Green channel goes in up (Y) direction and later under color grid the same color is pointing to up-left direction. What I'm missing here?
Another story is ... When I tried to apply this grid texture to orient instances under GN it takes Red in X dir, Green in Y dir ... and completely ignores negative (dark) direction as shown in the grid texture.
What I'm missing in my node tree?
Basically I wanted to use awesome addon Flowmap Painter (of Clemens Beute) to paint texture let instances orient in a brush movement ...
Provided solution in answer works great ... Thank you guys :)