thanks,Hasan3,
I just saw the information about normal vector.it says that the
normal_vectors{}  is the vertex's normal and If the number of normals
equals the number of vertices then the normal_indices{} list is optional
and the indexes from the face_indices{} list are used instead.
   I don't understand the normal_indices{} is record for what?HOw it relate
to normal_vectors{}?it seems   like face_indices{} in the example.
   if I can get the face's normal,can use it?how?thanks.


"Hasan3" <PRO### [at] Yahoocom> wrote:
> For smooth surface, yo must calculate normal vector. Your code is flat.
>
> For example :
>
> mesh2 {
> vertex_vectors{
> 8,
> <-1.224802,2.750054,3.593432>,
> <1.763963E-02,2.570504,2.81744>,
> <1.763963E-02,0,2.81744>,
> <-1.224802,0,3.593432>,
> <1.763963E-02,2.570504,2.81744>,
> <2.114852,3.271527,3.580328>,
> <2.114852,0,3.580328>,
> <1.763963E-02,0,2.81744>,
> }
> normal_vectors{
> 8,
> <-2.134022,0,-3.416781>,
> <-1.994692,0,-3.193701>,
> <-1.994692,0,-3.193701>,
> <-2.134022,0,-3.416781>,
> <1.961009,0,-5.390894>,
> <2.495811,0,-6.861088>,
> <2.495811,0,-6.861088>,
> <1.961009,0,-5.390894>,
> }
> uv_vectors{
> 3,
>      <0,1>, <1,1>, <1,0>
> }
>  texture_list{
> 1,
> texture {mat_white},
> }
> face_indices{
> 4,
> <3,1,0>,0,
> <3,1,2>,0,
> <2,5,1>,0,
> <2,5,6>,0,
>     }
> uv_indices{
> 4,
> <0,1,2>,
> <0,1,2>,
> <0,1,2>,
> <0,1,2>,
>     }
> normal_indices{
> 4,
> <3,1,0>,
> <3,1,2>,
> <2,5,1>,
> <2,5,6>,
>     }
>     }
>
>
>
>
> Hasan...

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