Quote:
Originally Posted by gravity
Maurice, - Thanks a lot for the excellent tutorials! If I ever make it big with an app, I'll be sure to donate for your dedication!
For tutorial 8 (labeled 7), I noticed what I think is an error. You say the normal vector is perpendicular to the plane which the vertices make up:
Shouldn't the normal vector point in the opposite direction here? The vertices are going in a clockwise direction, 0 -> 1 -> 2 and by the right-hand rule, the normal should be opposite.
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Hi gravity,
Perhaps, don't really remember what I was trying to achieve there as that diagram is a bit pointless except that it shows that the normal is perpendicular to a primitive's face. Also, that's a surface normal.
Nah, that section isn't my best work (not that I have any particularly good work). I'll re-write that bit.
Oh, and to answer your question, the normal is the cross product of two of the polygon's edges. That's what gives you the direction, not the right hand rule.
Simon
