vtkPointPicker qn.

Will Schroeder will.schroeder at kitware.com
Wed Sep 29 09:08:51 EDT 1999

vtkPointPicker picks the closest point (within a tolerance) to the pick ray - a point being vertex of a polygonal primitive (e.g., triangle). You may want to set the tolerance on the point picker to narrow the pick radius.

Mapper coordinates are determined by the coordinates of the points that the vtkMapper refers to. World coordinates are the coordinates after the actor's transformation matrix is applied.


At 07:12 PM 9/28/99 -0400, K.R.Subramanian wrote:
>If I pick against the polygonal geometry output by vtkContourFilter or vtkMarchingCubes (using 
>vtkPointPicker), what point is returned? Is it the exact point intersected by the intersecting ray 
>or the nearest vertex of the triangle (or polygon)?  Looking at the code, it seems like the closest 
>vertex (as the intersecting module goes through the list of points in hte mapper geometry). 
>Also, what is the distinction between world coordinates and mapper coordinates? Again, w.r.t. the 
>above filters are they the same? 

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