Hello
In 4.24 (or 4.23?) we’ve noticed a problem came back with hair: when we look through hair towards the light source hair is overly lit (especially when the light source does not cast shadows). This stands even for hair examples provided by Epic.
Can someone help us with this?
Thank you,
Bumping this up too, having the same issue in 4.26
turn off capsule direct shadow in the skeletal mesh shadow options.
In case someone still has problems with this. This works fine on UE 5.4.
Close your unreal engine first, if it is open.
Look for the file in Programs → Epic games → UE (Your UE version) → ( now on the search tab paste this HairBsdf.ush) once your pc finds the file, click on the file and your pc is gonna ask What application you wanna use to open that file, search for Visual Studio.
Now look for this piece of code, (will be found below the big grey text wall):
const float Backlit = min(InBacklit, HairTransmittance.bUseBacklit ? GBuffer.CustomData.z : 1);
Once you have found it, delete that entire line of code or put // in the beggining of the line.
Now paste this in the same line:
const float Backlit = min(InBacklit, GBuffer.CustomData.z);
Save and close, no need for compiling.
Open unreal, let it recompile shaders and now you are able to go to your hair shader and set you backlit node to “0”
Without this piece of code, the backlit doesnt work, hence why it lets all light go through the hair.
