I saw.
Quote:
20 general purpose variables that can be set by scripts and used in shaders. The float4 shader vectors vecSkill1 .. vecSkill17 contain the contents of material skill1..4, skill5..8, skill9..12, skill13..16, and skill17.. 20.
In my read: The general skill1..20 contain the special skills for shaders and materials. So when you use a material skill your script consumes one general skill.
And so on...