Good morning Mathieu (o;
I tried to change a blender file from Octane to E-Cycles…and spent some time due to the fact the the 3d viewport preview was much darker as the rendering…then I switched back to master branch and there the preview was fine…
Master branch 3d viewport preview (64 samples)
E-Cycles preview (64 samples)
Is the preset somehow affecting how alpha in principled shader is displayed?