Re: [Lib3ds-devel] texture mapping problem

Indrek Synter Fri, 12 May 2006 10:39:26 -0700

I'm sorry, I haven't used the Lib3DS library for a long time..

I think that loading a bitmap every time you display it isn't a very good idea. You should load the image in an initialization function first, then

// +-------- Number of textures to generate

// | +- Variable's address. It stores there Your texture ID

// v v

glGenTextures (1, &MyTextureID);

and then

// +- The same texture ID.

// v

glBindTexture (GL_TEXTURE_2D, MyTextureID);

and after that a glTexImage2D function or which one You prefer.

Are You updating the f and mesh pointers in the loop?
You can get a pointer to the next mesh like this:

mesh = mesh->next;

Or what did You use for exporting the 3DS model? Some exporters may only export the mesh without any textures or texture coordinates..

I had a rendering function like this in one of my programs:

void P_BLOCK::Render (P_BLOCKSINFO info){
     Lib3dsMesh *mesh;
     Lib3dsFace *face;
     Lib3dsMaterial *mat;
     unsigned int i, j, k;
     char msg[256];

     if (pNumMeshes){

     mesh = f->meshes;

     for (i=0; i<(unsigned)pNumMeshes; i++){
         for (j=0; j<mesh->faces; j++){
             face = &mesh->faceL [j];
             mat = lib3ds_file_material_by_name (f, face->material);
             if(mat){
                glMaterialfv (GL_FRONT, GL_AMBIENT, mat->ambient);
                glMaterialfv (GL_FRONT, GL_DIFFUSE, mat->diffuse);
                glMaterialfv (GL_FRONT, GL_SPECULAR, mat->specular);
             }
             glBindTexture (GL_TEXTURE_2D, info.Textures [FindMatNum(info, face->material)]);
    glBegin (GL_TRIANGLES);        // Begin Drawing Triangles
            glNormal3fv (face->normal);
            for (k=0; k<3; k++){
                         glNormal3fv (nnormal [i].normalL[3 * j + k]);
                if (mesh->texels > 0){
                            glTexCoord2f (mesh->texelL [face->points[k]][0],
                                          mesh->texelL [face->points[k]][1]);}
                            glColor3f (1.f, 1.f, 1.f);
                            glVertex3f (mesh->pointL [face->points[k]].pos[0],
                                        mesh->pointL [face->points[k]].pos[1],
                                        mesh->pointL [face->points[k]].pos[2]);
                     }
   glEnd ();           // Done Drawing Triangles
         }
         mesh = mesh->next;
     }
     }
}

I doubt if there was anything helpful in this reply..

Thank You,
All suggestions are welcome..

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Re: [Lib3ds-devel] texture mapping problem

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