Node Traversal

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E Hendon (elke++at++tyrann.atlas.de)
Tue, 27 Sep 1994 15:16:12 -0100 (GMT-1:00)

Dear Performer,
I wish to change the viewing matrix for a particular node so that the
object remains "apparently" always in front of my viewpoint. Of course
one could solve this by making this object a DCS. However, I wanted to
try pfPushIdentMatrix in a Traversal callback (is this ok?). I does not
seem to work, for the ovject is transformed as normal according to the
view matrix for the channel (pfChanView). Here is sample code. Where
have I gone wrong?

//During APP, before simloop:
setup()
{
  pfNodeTravMask(node, PFTRAV_CULL,0L,PFTRAV_SELF|PFTRAV_DESCEND,PF_SET);
  pfNodeTravMask(node,PFTRAV_DRAW,0xffffffff,PFTRAV_SELF|PFTRAV_DESCEND,PF_SET);
  pfNodeTravFuncs(node,PFTRAV_CULL,x_precull,x_postcull);
  pfNodeTravFuncs(node, PFTRAV_DRAW, x_predraw, x_postdraw);

}

static long x_precull(pfTraverser *trav, void *data)
{
        return(PFTRAV_CONT);
}

static long x_postcull(pfTraverser *trav, void *data)
{
        return(0);
}

static long x_predraw(pfTraverser *trav, void *data)
{
        pfPushIdentMatrix();
        return(PFTRAV_CONT);
}
static long x_postdraw(pfTraverser *trav, void *data)
{
        pfPopMatrix();
        return(PFTRAV_CONT);
}

will subordinate nodes of "node" likewise obey this traversal rule?

Thanks for hints and help!!
  
---------------------------------------------------------------------------
E. Hendon
                  Atlas Elektronik GmbH, D-28305 Bremen,
                    Sebaldsbruecker Heerstr. 235,
                    Simulation Division
                    elke++at++tyrann.atlas.de
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