Re: [Plib-users] Identifying objects after loading an AC3D- modell

[Steve B. <sjb...@ai...>]

Michael Wessels wrote:

> in my '.ac' file I have the comment field "Tribune1". How can I tell the
> PLIB loaders to call a callback function in the application when they find
> this comment field ?

Write a function like this:

   ssgBranch *process_userdata ( char *data )
   {
     if ( data == NULL || data [ 0 ] == '\0' ) return NULL ;

     if ( strncmp ( "Tribune1", data, strlen ( "Tribune1" ) ) == 0 )
     {
       ssgBranch *b = new ssgBranch () ;  /* ...or whatever you want this node to be */
       /* whatever you need to do here */
       return b ;
     }

     return NULL ;
   }


Sometime after ssgInit() but before you load your model:

   ssgLoaderOptions *loader_opts = new ssgLoaderOptions () ;
   loader_opts -> setCreateBranchCallback ( process_userdata ) ;
   /* You may wish to set other loader options here */
   ssgSetCurrentOptions ( loader_opts ) ;

...then just load your model in the usual way and whenever SSG
needs to create a branch node, it'll call your 'process_userdata'
function with the comment as the parameter.   If this is a 'special'
node, then you create the node and return it as the result.  If it's
not special then just return NULL and the loader will do something
appropriate.

---------------------------- Steve Baker -------------------------
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