Quote: "'set matrix normal' looks more like a DarkBASIC function"
Oh yeah, I never even noticed that
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How are you doing with your engine Hassan? You used to have a link in your sig, anyway we can view your progress now? If not, no problem, good luck with it.
Quote: "can give me a sample I can truly understand to use this function"
set matrix normal x,y,0.0,1.0,0.0
This will set the normal pointing straight up I think. It seems strange that you want to learn what a function does so you can use it, usualy people have a problem or need some desired behaviour and then ask what function or set of functions they need to use, not the other way around.
Anyway hope this helps, you may need to go and read up on what normals are if you are not sure.