Removing pfGeoStates

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Scott Herod (herod++at++evt.com)
Thu, 04 Jun 1998 12:14:06 -0600

Hello,
    I am still trying to understand a texturing problem that we are
having and was wondering if the following makes sense. We create some
objects:

  data->geoset = new pfGeoSet;
  data->geostate = new pfGeoState;
  data->tex = new pfTexture;
  data->texenv = new pfTexEnv;

attach them to each other appropriately:

  data->geoset->setGState(data->geostate);
  data->geostate->setAttr( PFSTATE_TEXTURE, data->tex );
  data->geostate->setAttr(PFSTATE_TEXENV, data->texenv);

make a node for them:

  data->geode = new pfGeode;
  data->geode->addGSet(data->geoset);

and add them to a DCS:

  data->dcs = new pfDCS;
  data->dcs->addChild(data->geode);

(I've left out various lines.)

At delete time, I need to remove everything but I'm finding that I
cannot pfDelete the GeoState even if the GeoSet has been deleted
because the reference count for the GeoState still includes its use
in the GeoSet. Thus,

  data->geoset->setGState(NULL);

is required prior to

  pfDelete(dataxs->geostate);

Similarly, the Texture and TexEnv require

  data->geostate->setAttr(PFSTATE_TEXTURE, NULL);
  data->geostate->setAttr(PFSTATE_TEXENV, NULL);

before they can be deleted even if the GeoState has successfully been
deleted. Is my understanding correct?

Thank you,
Scott Herod
herod++at++evt.com
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