bforrester wrote:
> In immediate mode you do something like:
>
> glNormal3f(0.0, 0.0, 1.0)
> glVertex3f(-1.0, -1.0, 1.0)
> glVertex3f( 1.0, -1.0, 1.0)
> glVertex3f( 1.0, 1.0, 1.0)
> glVertex3f(-1.0, 1.0, 1.0)
Yes, but that's just shorthand for
glNormal3f(0.0, 0.0, 1.0)
glVertex3f(-1.0, -1.0, 1.0)
glNormal3f(0.0, 0.0, 1.0)
glVertex3f( 1.0, -1.0, 1.0)
glNormal3f(0.0, 0.0, 1.0)
glVertex3f( 1.0, 1.0, 1.0)
glNormal3f(0.0, 0.0, 1.0)
glVertex3f(-1.0, 1.0, 1.0)
In immediate mode, it remembers the last vector you
passed to glNormal and uses that each time you call
glVertex. But when using arrays, you have to be
explicit about the normal for every vertex. They're
only the same if you're doing flat shading, and
OpenGL has no way of knowing whether you're doing
that or not.
--
Greg
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