[openvrml-develop] Author of VrmlNodeLOD class

[Damian M. <da...@es...>]

Inside the code for VrmlNodeLOD, there are comments for delayed-load
inlines.

I was interested in knowing who is the author of this because I wish to
have an optional method of load whereby the load is delayed until that
level of the LOD is required to be rendered.  I would be curious to
discuss the issues.  I do not need the delayed load to be asynchronously
executed.  Actually, I explicitly do NOT want to done asynchronously as
I want it done only the first time it is rendered.

I have having trouble figuring out what structure I need to manipulate
to get this effect and any associated code I need to write to get it
fully implemented.

void
VrmlNodeLOD::recalcBSphere()
{
  //cout << "VrmlNodeLOD[" << this << "]::recalcBSphere()" << endl;
  d_bsphere.reset();

  // let's say our bsphere is the union of the bspheres of all the
  // levels. we could have said it was just the bsphere of the current
  // level, but the current level depends on the viewer position, and
  // we'd like to make the calculation idependent of that. we could do
  // some sort of trick where we reset the bsphere during render, but
  // that seems like overkill unless this simpler method proves to be
  // a bottleneck.
  //
  // hmm: just thought of a problem: one of the uses of the lod is to
  // switch in delayed-load inlines. this would necessarily switch
  // them in all at once. live with it for now.
  //
  for(int i=0; i<(int) d_level.getLength(); i++) {
    const VrmlBVolume* ci_bv = d_level.getElement(i)->getBVolume();
    d_bsphere.extend(*ci_bv);

  }
  this->setBVolumeDirty(false);
}

Many Thanks - Damian (McGuckin)

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