[Paraview] [Paraview-developers] 3d surface roughness measurement

[Moreland, Kenneth]

(Responding back to the ParaView user's list, which is more appropriate
than the developer's list.)

The documentation for the mathematical operation done by the curvature
operation is given here:

http://www.vtk.org/doc/nightly/html/classvtkCurvatures.html#details


You can also get more general descriptions of Gaussian curvature and mean
curvature estimation from various sources. Here is a description on
Wikipedia:

http://en.wikipedia.org/wiki/Curvature#Curvature_of_surfaces


If I am reading the documentation correctly, the Gaussian curvature is
giving you the bend of the surface in radians per distance squared, and
the mean curvature is giving you the bend in radians per distance.

Playing with the filter a bit, I notice that it is prone to give you
unreasonably high values (in the positive or negative direction) for
places where the surface is pinched or you have poorly shaped triangles in
the mesh.

-Ken



On 5/4/15, 5:54 AM, "Laura Masse" <dragon.prog at gmail.com> wrote:

>Hi Kenneth,
>
>I take again this threat, I'm sorry for the long delay.
>
>The curvature filter seems is the thing I need, I would like to have a
>numerical indicator of the surface roughness. Curvature filter gives me
>two
>different indicator depending which were selected (Gaussian and Mean). In
>both cases I got data range, but I don´t understand the meaning of these
>ranges.
>
>For example in the case of Mean_Curvatura I got [-199,711, 165.178]
>
>Could be is the mean of the bend of all points ?
>
>I'm so confuse, please anyone can help me ?
>
>Otherwise, Is there a other way to have the roughness indicator ?
>
>Advanced thanks !!!
>
>- 
>
>
>
>--
>View this message in context:
>http://the-unofficial-paraview-developers-forum.34153.x6.nabble.com/3d-sur
>face-roughness-measurement-tp3657p3767.html
>Sent from the The Unofficial ParaView Developers Forum mailing list
>archive at Nabble.com.
>_______________________________________________
>Powered by www.kitware.com
>
>Visit other Kitware open-source projects at
>http://www.kitware.com/opensource/opensource.html
>
>Search the list archives at:
>http://markmail.org/search/?q=Paraview-developers
>
>Follow this link to subscribe/unsubscribe:
>http://public.kitware.com/mailman/listinfo/paraview-developers