[vtkusers] Hi, Question about point picking.

[Hui Zhang (James)]

Hi,

I have a problem in picking a point in the viewport. What I do is to click one point in the window and try to get the coordiate in world system. After click the mouse, I can get the x, y position, then .

  float pos[3], z = 0;
  vtkWorldPointPicker* picker = vtkWorldPointPicker::New();
//  vtkPropPicker* picker = vtkPropPicker::New();
  picker->Pick(x, y, z, m_Renderer); 
  picker->GetPickPosition(pos);

 I found that regardless where I click the point, they will respond the same Zbuffer value. I check using with the following code

  float z2 = m_Renderer->GetZ(x, y);

So I found the return value of z2 is always 1.0 regardless of x and y. Feel strange about it, anyone has some code to get the world coordinate from selected point in the viewport?

Thanks


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Hui Zhang (James), Ph.D.   

Imaging Science and Information Systems (ISIS) Center
Radiology Department, Georgetown University Medical Center     
2115 Wisconsin Avenue, Suite 603, Washington, DC 20007      

Office: 202-687-2902
Cell: 240-643-7103
Fax: 202-784-3479
Web: www.isis.georgetown.edu
Email: zhang at isis.imac.georgetown.edu
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