Dennis,
Yes, this cat has a zipper that allows it's skin to come right off. (Maybe I
took that "skin the cat" metaphor a bit too far.)
Anyway, just run the Extract Surface filter. After that you can run the
Generate Surface Normals filter.
-Ken
From: ParaView [mailto:paraview-boun...@public.kitware.com] On Behalf Of Dennis
Conklin
Sent: Monday, April 9, 2018 1:22 PM
To: Paraview (parav...@paraview.org) <parav...@paraview.org>
Subject: [EXTERNAL] [Paraview] Normal vector to Exodus Sideset elements
All,
I'm sure I'm missing something here, so please knock me up alongside the head
and point it out.
I load a sideset (surface) from an Exodus file. I end up with a bunch of
quads that Paraview conveniently created for me from the surface. I need to
calculate a Normal vector for each of these quads. I have tried:
Generate surface normal - this is greyed out (wants poly data?)
Delaunay 3D on this to generate poly data, which I could then hopefully run
Generate surface normal on, but it was still greyed
Tried Normal Glyphs which gave me point Normal vectors but gave me a bunch of
Triangle and Polygon elements - I'm not sure what's going on here.
PointDataToCellData to get GlyphVector for each Cell
Python Calculator and ask for area(inputs[0]) the Polygon elements all get
an Area of -1
Calculator to get Area_X as product of GlyphVector_X and Area
Threshold on Area_X > 0 - don't want negative areas or some boundary cells
with GlyphVector_X as negative
Python Calculator to get sum(Area_X)
This number appears to be about half of my expected number
These must be an easier way. I'm not a vtk guru. When I first load my
surface, is there some vtk routine I could call within a Programmable filter to
get the cell normal?
Alternatively, anyone got an easier way to skin this cat?
Thanks for any hints you may have.
Dennis
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