[Paraview] how to utilize warp vector filter?

[Berk Geveci]

Sometimes paraview can be confusing. Let me try to explain what you
are seeing. Each object in the pipeline browser gets assigned a set of
objects to visualize them. I am not going to go into a lot detail but
the relevant object here is a filter that extracts geometry from the
object (vtkDataSetSurfaceFilter). This filter converts any type of
dataset to a set of polygons to be rendered by OpenGL. This may be an
outline or the surface polygons. This filter also automatically
generates normals. This is what you are seeing in the "Color By" menu.
To duplicate this behavior, you can apply "Extract Surface" and then
"Generate Surface Normals". Then you can apply the glyph filter.
Orient by the normals and scale by scalars.

-berk

On Wed, Apr 16, 2008 at 3:57 PM, Julian Cummings
<cummings at cacr.caltech.edu> wrote:
> Hello,
>
>  I have a set of scalar data on an unstructured grid representing
>  effective stress on a cylindrical tube.  I would like to use the warp
>  vector filter to exaggerate the displacement of the tube surface.  It
>  appears that I need to have the cell normals available as a data array
>  in order to scale the displacement and make it more visible.  How do I
>  do this?  When I load my unstructured grid data set, neither the Normals
>  Generation filter nor the Warp (vector) filter is available.  ParaView
>  is able to color the tube using cell normal as an attribute, but there
>  does not seem to be a way to extract this attribute and use it for the
>  warp vector filter.  Any advice would be appreciated.
>
>  Thanks, Julian C.
>
>  --
>  Dr. Julian C. Cummings                       E-mail: cummings at cacr.caltech.edu
>  California Institute of Technology           Phone:  626-395-2543
>  1200 E. California Blvd., Mail Code 158-79   Fax:    626-584-5917
>  Pasadena, CA 91125                           Office: 125 Powell-Booth
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