What is the fixed3 “halfDir” parameter found on some shaders (such as Mobile/Bumped Specular)?
It seems to be undocumented ( Unity Manual as opposed to Unity Manual )
I didn’t look at the “Mobile/Bumped Specular” source code, but I assume it’s the halfway vector.
Agree with Peter77. Use of the halfway vector is explained at, e.g. Cg Programming/Unity/Brushed Metal - Wikibooks, open books for an open world
Thanks for the help. I did eventually find a little documentation for it on Unity’s site, although not by that name (“halfasview”).