Foliage/grass is way too bright in path tracer - How to Fix?


New to unreal - trying to use it for arch viz but having a hard time figuring out the lighting with foliage. For some reason when using path tracer my foliage/grass is way too bright compared to LIT mode. I didnt have this issue with another project but that was before the whole FAB introduction so I dont know whether it may have something to do with that?

Would REALLY appreciate if anyone can figure this out or if im just being a noob with settings…

I had the same problem, and it was also related to the FAB transition. I figured out a workaround. For some reason, the path tracer behaves strangely with the “brightness” settings for foliage textures (probably due to subsurface scattering. and translucency of plant materials). If you go into your plant folder, go to the material instance (I am not using billboards, so not the material instance billboard). Search for “brightness” or “bright” or whatever, and adjust the values down. I was using a base color brightness of about .5 and translucency of around 1, but art direct it to get the appearance you want.

This was super annoying for me as well. It worked perfectly before and then broke, and no one else seemed to have posted a solution (probably because FAB is new). Hopefully, this works for you! I’ll upload a couple of photos of before and after on my end to show the difference, as well as the material and the controls. The flowers I’m using have extra controls for leaves, but my grasses only have two for brightness it seems. You can also play around with the saturation values to affect the brightness, but I found the standard saturation values got me close enough, and only needed to mess with brightness. Hope this helps!





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