[Paraview] how to utilize warp vector filter?

[Berk Geveci]

Is the displacement a vector or a scalar?

On Wed, Apr 16, 2008 at 9:51 PM, Julian Cummings
<cummings at cacr.caltech.edu> wrote:
> Hi Berk,
>
>  This got me a lot closer to where I want to be, but not quite there yet.
>  I want to magnify or exaggerate the very small ripples or displacements
>  on my tube, so I believe that I need to use the Warp (vector) filter
>  rather than the Glyph filter (which draws arrows rather than moving the
>  polygons).  I tried doing this, but the result looks strange...
>
>  I can see the displacements if I simply scale the Y and Z axes by a
>  factor of 100 (the X axis points along the tube in my geometry), but
>  then of course the tube appears squished.  I was hoping for a simple way
>  to enhance these radial displacements using ParaView filters.
>
>  -- Julian C.
>
>
>
>  On Wed, 2008-04-16 at 20:04 -0400, Berk Geveci wrote:
>  > 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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>  >
>
>