[vtkusers] Picking

[Denis Shamonin]

ramu chandran wrote:

> Hello Users,
>                Can somebody please tell me how to pick a point upon 
> mouse click. I get X and Y coordinate of the window upon mouseClick. 
> now how do I pick the particular point of the 3D object using these 
> two coordinates. I tried using vtkPointPicker, but its not working 
> properly. A small example code will be of great help. I am running out 
> of time. please somebody help me.

I think this can help you a little :)
==================================================

MyClass::MyClass()
{
picker = vtkCellPicker::New();
}

void MyClass::SelectPoint(int X, int Y)
{
  float Point[3];
    if(PickPoint(X,Y,Point))
      {
      cout<<"Point("<<Point[0]<<","<<Point[1]<<","<<Point[2]<<")\n";
      renwin->Render();
      }
}

int MyClass::PickPoint(int X,int Y,float Point[3])
{
  float *pos;

  int result = picker->Pick((float)X,(float)Y,0.0,ren);
  if (result)
    {
    pos = picker->GetPickPosition();
    for(int i=0;i<3;i++)
          Point[i] = pos[i];
    return 1;
    }
   
  return 0;
}

-- 
Denis Shamonin
Address       : Section Computational Science
                University of Amsterdam
                Kruislaan 403, 1098 SJ Amsterdam
                the Netherlands

E-mail        : dshamoni at science.uva.nl
URL           : http://www.science.uva.nl/~dshamoni/