Hey list, how can I achieve the equivalent to Arnolds Backlight with Mantra? I am trying to create a simple (fast) paper shader that'll work on single sided geometry.

Cheers!

Pingo

You need to calculate lighting twice - once with the regular normal and again with a flipped normal. Here's a minimal example, you can probably extend it to fit your needs.

Absolutely beautiful. Thanks!

Actually, how would I use this in a larger context - or expand on i. If I wanna use the surfacemodel in the VEX Builder instead - or in combination - to get more options.. If you don't mind - This would be really nice to have as a switch on the Mantra Surface, btw.

Oh, I got it. Exchanged the lighting model with the surface model and exposed the Ensure face forward. Man I like this!

pingo
.. This would be really nice to have as a switch on the Mantra Surface, btw.

set Refraction Model in Refraction tab to Translucency, it does internally the same thing (Diffuse BRDF on inverted Normal)