[vtkusers] picking in a view of a vtkImagePlaneWidget

[dean.inglis at on.aibn.com]

John,

with vtkPropPicker, did you try something like

init:
      PropPicker->InitializePickList();
      PropPicker->AddPickList(Prop);

useage:

if( !PropPicker->PickProp(X,Y,CurrentRenderer) ){ return; }

  if( Prop !=  this->PropPicker->GetProp() ){ return; }

  float pos[3];
  PropPicker->GetPickPosition(pos);

I have used this scheme to successfully pick
on  an vtkImageActor.  There may need to be a trasformation involved to change pos into something
you could look up into the origina image data.

Dean