User:SirYodaJedi/Porting IdTech 3 maps to Source/Shader2VMT

Some miscellanea for the User:SirYodaJedi/Porting IdTech 3 maps to Source#Converting materials section that would bloat the page if put there.

blendFunc

Can blend textures together (detail textures, glowing textures, etc.) and/or be used for translucency, depending upon parameters.

alphaFunc

Alphatesting. Unlike , supports alpha-clipping translucent textures. Any textures with translucency will need to not have alpha-testing when ported to , and may need to be edited (to sharpen the alpha channel). It takes one parameter:

Parameter	Header text	Header text
GT0	Greater Than 0. Usually used in conjunction with	If not translucent (rare): $alphatest 1 $alphatestreference "0.01"
LT128	Less Than 128. This designates an inverted alpha channel.	If not translucent: First invert the alpha channel in an image editor (linear invert). $alphatest 1
GE128	Greater than or Equal to 128. Standard alpha testing; anything less than 127 will be transparent, and anything greater than or equal to 128 will be opaque.	If not translucent: $alphatest 1
GE192	Greater than or Equal to 192. Added in Jedi Academy. Like GE128, but with the clipping threshold set to 192	If not translucent: $alphatest 1 $alphatestreference "0.75"