Re: [Plib-users] (Again) accessing vertex infos of a loaded model

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

Filippo wrote:
> 
> This message was sent from Geocrawler.com by "Filippo" <sup...@ho...>
> 
> Hi Steve, thanks for your patience... I saw a lot
> of methods to query the geometry in ssgLeaf, but
> I can't get these data from the ssgEntity I have
> in return from the ssgLoad function because I
> don't know how to get to the leaves.

Starting with the node returned by the loader, you
can say something like:

 void extract_vertices ( ssgEntity *node )
 {
   /* WARNING - RECURSIVE! */

   if ( node -> isAKindOf ( ssgTypeLeaf () ) )
   {
      ssgLeaf *l = (ssgLeaf *) node ;

      ...extract the vertices from 'l'...
   }
   else
   if ( node -> isAKindOf ( ssgTypeBranch () ) )
   {
     ssgBranch *b = (ssgBranch *)node ;

     for ( int i = 0 ; i < b->getNumKids() ; i++ )
       extract_vertices ( b -> getKid ( i ) ) ;
   }
 }

It's a *little* more complex than that because there could
be ssgTransform nodes in the heirarchy - you'd have to
accumulate the matrix transforms to know how to position
the vertices you get out of the leaf nodes beneath.  Also,
you need to think about what you want to do with ssgSelector
nodes.

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