Q: How to make normal point outward?

[Will Schroeder]

Hi Scott-

>I've got a 3D object that is defined in vtkPolyData form. I'd like to make sure that all of the polygon normals point "outward" in the right-hand rule sense. Is there an easy way to do this within VTK?

There are two filter to look into: vtkPolyDataNormals and vtkReverseSense.

vtkPolyDataNormals should do the trick (it generates normals). However, if for some reason you need to reverse the ordering of the polygons and/or normals, you can use vtkReverseSense.

Will


--------------------------------
Dr. William J. Schroeder
Kitware Visualization Solutions / vtk Commercial Support
469 Clifton Corporate Parkway
Clifton Park, NY 12065
will.schroeder at kitware.com
1-518-371-3971 (Phone & Fax)


-----------------------------------------------------------------------------
This is the private VTK discussion list.  Please keep messages on-topic.
Check the FAQ at: <http://www.automatrix.com/cgi-bin/vtkfaq>
To UNSUBSCRIBE, send message body containing "unsubscribe vtkusers" to
<majordomo at gsao.med.ge.com>.  For help, send message body containing
"info vtkusers" to the same address.     Live long and prosper.
-----------------------------------------------------------------------------