Hello ! I have been trying to sample a 3D LUT (Look Up Table) to be used inside my shader (using shadergraph). I read about how 3D Lut worked and how theoretically I should be able to sample it, but I cannot get my head around this one. It almost works. I am testing with a neutral LUT so the input color should be the output color.
I am having an issue with the blue, Pure blue returns magenta, as if I have a small offset on the U to the left, resulting on the wrong cell of the LUT.
If I had a small value (0.01) to my U then the blue is accurate, but the red is no longer (since they both share the U value).
Anyone ever succeeded in doing this sampling ? I thought it would be rather simple but I have been working on this for a long time.
I would appreciate any help, thank you !
I want to use the LUT in the shader because I will later guide some effects with a custom LUT.
