[Plib-users] callbacks

[Tinoshi K. <ti...@li...>]

Hello!!!

I want to draw an object (loaded from an .ac file) in wireframe. I want =
this to be the only object in wireframe of the scene. How can I do? I've =
tried to use setCallback and stuff, but even if it seems to set up the =
callback properly, nothing happens... In my callback I've first called =
just glPoligonMode(GL_CULL_FACE,GL_LINE), then following the viewer =
example, I used:

static int setWireframe(ssgEntity *e)
{
 //glPolygonMode ( GL_FRONT_AND_BACK, GL_LINE);
 if ( e -> isAKindOf ( ssgTypeLeaf() ) )
  {
    ssgLeaf* leaf =3D (ssgLeaf*) e ;
    leaf -> drawHighlight ( red ) ;
  }
  return 1 ;
}

static int setFlat(ssgEntity *e)
{
 //glPolygonMode ( GL_FRONT_AND_BACK, GL_FILL);
 return TRUE;
}

void Aeroplane::wire_update ( ssgEntity *e)
{
  if ( e -> isAKindOf ( ssgTypeBranch() ) )
  {
    ssgBranch *br =3D (ssgBranch *) e ;
   =20
    for ( int i =3D 0 ; i < br -> getNumKids () ; i++ )
      wire_update ( br -> getKid ( i ) ) ;
  }
  else if ( e -> isA ( ssgTypeLeaf() ) )
  {
    ssgLeaf* leaf =3D (ssgLeaf *) e ;
    leaf -> setCallback ( SSG_CALLBACK_PREDRAW, setWireframe) ;
  }
}

I'm programming in C++, and all the examples I've seen are projects with =
just main.cpp, so maybe I did a wrong initialization?

in class Aeroplane.h:

 ssgCallback setWireframe;
 ssgCallback setFlat;
 void wire_update ( ssgEntity *e);

The strange thing is that wire_update executes leaf -> setCallback ( =
SSG_CALLBACK_PREDRAW, setWireframe) ; just 7 times... My .ac model is =
very big, I think that is not possibile... something's wrong isn't it?
The Entity i pass to void Aeroplane::wire_update ( ssgEntity *e) is the =
one returned by ssgLoadAC()...

HELP!!!

and thank you very much!!!!