[vtkusers] vtkPolyDataNormals

[Nigel Nunn]

Hi Xianjin Yang, 
 
> I am trying to render a bounding box or cube-like axes 
> around my vtkPolyData object (scattered points).  In VTK/ 
> Examples/Annotation/Tcl/cubeAxes.tcl, a vtkPolyDataNormals 
> object is needed for use of vtkCubeAxesActor2D, that is, 
> axes->SetInput(normals->GetOutput()); My question is how to 
> get a vtkPolyDataNormals object (normals) from my vtkPolyData 
> object? Note that my vtkPolyData object consists of some 
> scattered points without edges and faces. 
 
The documentation for vtkCubeAxesActor2D explains the different 
ways to set both the bounds and the range for vtkCubeAxesActor2D. 
If you can get a bounding box for your scattered points, you can 
use this as the bounds for the axes.  Also, if you can get the 
actual min and max data values for each direction, then you can 
use these as the range for the data labels: 
 
  m_pCubeAxesActor->SetBounds(axis_bounds); // display bounds 
  m_pCubeAxesActor->SetRanges(axis_range);  // numeric range 
  m_pCubeAxesActor->UseRangesOn();          // use range [ON] 
 
Nigel 
 
 

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