Re: multiple materials per mesh - new in lib3ds 2.0 ?

hi,
the 3ds format allows material assignment per face (and both lib3ds 1.x 
and 2.0 support this).
Note that material handling is a little bit different in lib3ds 2.0.
Indexes are used instead of strings to waste less memory.
--jan eric

Adrian Bedeau wrote:
> Hi,
>
> In looking through this forum a few weeks back, I found this post 
>
http://sourceforge.net/mailarchive/forum.php?thread_name=1074644471.3365.48.camel%40localhost&forum_name=lib3ds-devel 
> <http://sourceforge.net/mailarchive/forum.php?thread_name=1074644471.3365.48.camel%40localhost&forum_name=lib3ds-devel>
> from which I concluded that one mesh can only have one material. 
> However, in the upcoming 2.0 release of lib3ds there is an example 
> called cube.c which now leads me to think otherwise. Below is the 
> relevant part of cube.c:
> //-------------------------------------------------------------------------------
> //first material
>   Lib3dsMaterial *mat = lib3ds_material_new("c_tex");
>       lib3ds_file_insert_material(file, mat, -1);
>       strcpy(mat->texture1_map.name <http://texture1_map.name>, 
> "cube.tga");
>       mat->texture1_map.percent = 1.0;
> //second material
>       mat = lib3ds_material_new("c_red");
>       lib3ds_file_insert_material(file, mat, -1);
>       mat->diffuse[0] = 1.0;
>       mat->diffuse[1] = 0.0;
>       mat->diffuse[2] = 0.0;
> //third material
>       mat = lib3ds_material_new("c_blue");
>       lib3ds_file_insert_material(file, mat, -1);
>       mat->diffuse[0] = 0.0;
>       mat->diffuse[1] = 0.0;
>       mat->diffuse[2] = 1.0;
>    }
>
>       Lib3dsMesh *mesh = lib3ds_mesh_new("cube");
>
>       for (i = 0; i < 8; ++i) {
>          mesh->faces[i].material = 0;      //I think this is applying 
> the first material to faces  0 through 7
>       }
>       for (i = 0; i < 2; ++i) {
>          mesh->faces[8+i].material = 1; //I think this is applyingthe 
> second material to faces  8 through 9
>       }
>       for (i = 0; i < 2; ++i) {
>          mesh->faces[10+i].material = 2; //I think this is applyingthe 
> third material to faces  10 through 11
>       }
>
> //------------------------------------------------------------------------------- 
>
>
> The cube written out has 1 blue face (2 triangles), 1 red face, and 4 
> grey face. From this it seems that you can have more than one 
> materials per mesh, but one material per face. I am wondering if this 
> is new in lib3ds2.0 or have I always misunderstood that you can have 
> only 1 material per mesh? 
>
> Thank you for taking time to help me.
>
> Adrian
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