Hi, I have been using Blender for about a year now, however I am new to Blender Artists, and I have no experience with OSL (or coding in general for that matter), but, I could get my head round the OSL introduction on Blender Cookie, and hope that my query is fairly simple. I was wondering how it would be possible to implement an OSL Screen Shader (similar to an Add/Mix shader): in order to create a human skin shader similar to the one outlined by Ben Simmonds for BI.
I believe the equation for screen blending is something like 1-((1-A)*(1-B)), but I don’t know how to use the formula in an OSL shader.
Thank you in advance for any help you may be able to offer.