Before you tell me to Google it I can't because my Internet is very slow at the moment and I can barely make this thread. Don't worry it's not a problem
My problem is I need to know how to make textures have parts that become invisible like in HL1 with the textures that had a certain blue...
If you must know I am making a 2D bush (Plant not the President) but it would be impossible to clip the white bits...So I need to know the colour or the technique that is used to make Source materials have invisible bits.