pfChanPick

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Suguru Ishizaki (suguru++at++media.mit.edu)
Thu, 28 Jul 94 18:29:17 -0400

I have recently switched to Performer 1.2 and found the picking
function is not quite the same as that of 1.1. The following is the
simplified source code re-written for 1.2 and it doesn't work.
"pfChanPick" returns 0 most of the time; but it sometimes returns
non-zero when I do not hit any object. I am certain that the other
part of the code is correct since this program worked perfectly when I
was using 1.1.

----------------- source code -----------------
      .
      .
      .

      pfHit **hit[10];

      long hit_flags;
      pfGeoSet *hit_gset;
      pfNode *hit_geode;
      pfVec3 hit_point;
      long pick_count;

      pfNodePickSetup(Scene);

      .
      .
      .

      pickx = (float) getvaluator(MOUSEX);
      picky = (float) getvaluator(MOUSEY);
      getsize(&win_wd, &win_ht);
      getorigin(&win_x, &win_y);
      pickx = (pickx - (float) win_x) / win_wd;
      picky = (picky - (float) win_y) / win_ht;

      pick_count = pfChanPick(chan0, PFTRAV_IS_GSET, pickx, picky, 0.0f, hit);

      pfQueryHit(*hit[0], PFQHIT_GSET, hit_gset);
      pfQueryHit(*hit[0], PFQHIT_FLAGS, &hit_flags);
      pfQueryHit(*hit[0], PFQHIT_POINT, hit_point);

      .
      .
      .

----------------- end of source code -----------------

I'm sure I'm dowing something wrong.
I would appreciate if anybody can point me what's wrong.

Thank you.

Suguru Ishizaki
Visible Language Workshop
Media Laboratory, MIT

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