I feel like I tried everything, but nothing seems to work, thought when I click the "preview this texture map in viewport" button, the map appears correctly...
I exported the emissive map from substance painter as srgb(but i also tried L8/L16/L32F) but everything I tried so far gives the same result in marmoset... The purple gradient just vanishes. The picture on bottom right is a picture of the emissive map I used (it is zoomed on the purple gradient)
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problem solved... I was using png 8bit image and I switched to exr 32bit now I have my gradient !!!!!!!!!!!!!!!!!!!!!
exr doesn't work everytime sometime it'll be tiff, sometime hdr... even png lol... I hate this