[vtkusers] vtkPointPicker

[Sarah Graham]

Will,

Thanks for the tips.  I implemented the markers using vtkGlyph3D, and all
works well... UNTIL I try to rotate the model.  Then, I get a similar
error as before: "[processId] Killed".  

So the questions remains-is it my code, or is there something going on in
the vtkRenderWindowInteractor causing this?

Here's a brief description of my implementation:
PickerHandler() :
  pointSet->InsertNextPoint(currPicker->GetPickPosition());
  points->Modified(); 
Main():
  pointSet = vtkPoints::New();
  points = vtkPolyData::New();
	points->SetPoints(pointSet);
  vtkSphereSource *sphere...
  vtkGlyph3D *glyph...
	glyph->SetInput(points);
	glyph->SetSource(sphere->GetOutput);
  ...
  renderer->AddActor(glyphActor);

  iren->SetEndPickMethod(PickerHandler...);
  iren->Initialize();
  iren->Start();

Thanks for your help,
-Sarah

On Fri, 7 Jul 2000, Will Schroeder wrote:

> Hi Sarah-
> 
> At 11:31 AM 7/7/00 -0400, Sarah Graham wrote:
> 
> >So...2 questions:
> >1) Any idea why the program is crashing when I try to add markers and then
> >move the model.
> >2) Is there a better way to add multiple spherical markers other than
> >creating a new sphereActor each time?
> 
> 1) I'm guessing it's a memory problem...I use Rational's Purify product to track things like this down.
> It's expensive but very good. Also, it may not support your compiler.
> 
> 2) You can add points to a vtkPolyData, and then use vtkGlyph3D to place spheres around the points.
> That way the pipeline never changes, just the data in the initial vtkPolyData. (Caution: if you add a point
> to the vtkPolyData, you will probably manually want to send a Modified() to the polydata to insure that
> the pipeline executes properly. This is because low-level data access functions do not invoke Modified() 
> for performance reasons.)
> 
> Will
> 
> 
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------------------------
Sarah Graham
Johns Hopkins University
sarah at cs.jhu.edu
http://www.sarahgraham.org