Pitfalls in Picking

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From: Guenter Schreiber (Guenter.Schreiber++at++dlr.de)
Date: 04/24/2001 04:01:20

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Hy pfGurus,

I try to perform picking on my scene, and I obtain no result.
The code of my viewer is based on perfly.

Well, I'm setting up like the following

  pfNodePickSetup(viewChan->getScene());

  pfHit ** picklistp=NULL;
  pfuCalcNormalizedChanXY(&nx, &ny, viewChan, x, y);
  count = viewChan->
pick(PFPK_M_ALL/*NEAREST*/|PFTRAV_IS_PRIM|PFTRAV_IS_PATH
                          ,
                          nx,ny,0.10f, &picklistp);
  printf("handlePick count %d %f %f %d %d\n", count, nx,ny,x,y);

Wich is code quite similar to pfiPick.C

But as I perform the pick, I obtain no result. I can click everywhere in
my window.

So my question is, are there some other pitfalls, I'm not aware of?
Like setting some flag somewhere in the database or having a disturbing
callback ?
e.g. pfNodePickSetup()

In which context has chan->pick to be called?
APP/CULL/DRAW
before or after pfSync, pfFrame

How can I debug the picking to find out?

Thanks in advance

Günter

-- 
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Next message: Soren Vorre Therkildsen: "On the subject of stereo on Linux"
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