/* something like this is inside the glm.c file */

typedef struct _GLMmodel {

  ...
  GLuint   numvertices;			/* number of vertices in model */
  GLfloat* vertices;			/* array of vertices  */

  GLuint   numnormals;			/* number of normals in model */
  GLfloat* normals;			/* array of normals */

  GLuint   numtexcoords;		/* number of texcoords in model */
  GLfloat* texcoords;			/* array of texture coordinates */
  ...

  GLuint       numtriangles;		/* number of triangles in model */
  GLMtriangle* triangles;		/* array of triangles */
  ...

} GLMmodel;



GLMmodel *reallyBigDragon;
GLuint *dragonIndices;


void init( void )
{
   ...
   reallyBigDragon = glmReadOBJ( "myDragon.obj" );
   glmUnitize( reallyBigDragon );
   glmVertexNormals( reallyBigDragon, 90.0 );
   ...

   SetupDragonIndices();
}

void SetupDragonIndices( void )
{
   dragonIndices = (GLuint *)malloc( 3 * reallyBigDragon->numtriangles * sizeof( GLuint ) );
   
   ... iterate through the GLMgroups in the model ...
   ... for each group, look at each triangle -- which gives 3 indices ...
   ... reallyBigDragon->groups->triangle[i]->vindices[0..2] contain ...
   ...   the 3 vertex indices for triangle i (in the group) ...
   ...   this should be the same as the normal index ->nindices[0..3] ...
   ...   (if it isn't you'll need to specifically set up the normal and ...
   ...   vertex arrays as well), reallBigDragon->groups->next points to ...
   ...   the next triangle group (if it exists) ...
}


void display( void )
{

   // ... standard setup stuff, like clear screen...

   // Setup the location of the sphere
   // Setup the color of the sphere.

   if (usingDisplayList)
       glCallList( sphereListID );
   else if (usingVertexArray) {
       glEnableClientState( GL_VERTEX_ARRAY );
       glEnableClientState( GL_NORMAL_ARRAY );

       glNormalPointer( 3, GL_FLOAT, 0, reallyBigDragon->normals );
       glVertexPointer( 3, GL_FLOAT, 0, reallyBigDragon->vertices );

       glDrawElements( GL_TRIANGLES, 3*reallyBigDragon->numTriangles, GL_UNSIGNED_INT, dragonIndices );
       glDisableClientState( GL_VERTEX_ARRAY );
       glDisableClientState( GL_NORMAL_ARRAY );
   } else
       CreateSphere( 1.0, 10 );

   // ... do standard per-frame cleanup ...
  
}