Hi All.
I have a question about how ogl auto generate the texture coordinates.
I have read the glspec2.0 and found when use OBJECT_LINEAR,the
generation function is:
g = p1xo + p2yo + p3zo + p4wo
so we can write as:g = (p1 p2 p3 p4)(xo yo zo wo)T

and EYE_LINEAR is:
g = p'1xe + p'2ye + p'3ze + p'4we
so we can write as: g = (p'1 p'2 p'3 p'4)(xe ye ze we)T

as ( p'1 p'2 p'3 p'4 ) = ( p1 p2 p3 p4 )M-1
and (xe ye ze we)T = M(xo yo zo wo)T
so when use EYE_LINEAR,the function is also:g=(p1 p2 p3 p4) (xo yo zo
wo)T
same as OBJECT_LINEAR.

As we all know,these two function indeed have difference in use,but why
it seems they have the same generation function? Am I miss something?

Alvin wrote:
> when use OBJECT_LINEAR,the generation function is:
> ...
> 
> and EYE_LINEAR is:
> ...
 >
> As we all know,these two function indeed have difference in use,but why
> it seems they have the same generation function? Am I miss something?
> 

OBJECT_LINEAR uses the coordinate of the vertex
as input

EYE_LINEAR uses the vertex transformed by the
current MODELVIEW matrix.


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