The shader looks great in my test program.

Unfortunately in MM3D the character gets very dark when adding the shader to it.

Maybe I have to play around with the intensity values a bit? In MM3D we the sunlight is set to 0,0,0 maybe that's the reason.

Meteor Mess 3D:
https://www.meteormess.de
Facebook:
https://www.facebook.com/MeteorMess3D
Twitter:
http://www.twitter.com/MeteorMess3D
Discord:
https://discord.gg/naJJgdMQDV