[Paraview] Visualization of principle stresses

[David E DeMarle]

An image (of enough resolution to see the glyphs and LIC texture)
would help clarify what you mean.

But, if you don't care about the direction of the vector field, take
its magnitude and use scalar visualization techniques on that. One way
to do that is to use the expression mag(vectorarrayname) in the
calculator filter.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909



On Wed, Mar 14, 2012 at 6:39 AM, gebbi86 <gebbi86 at googlemail.com> wrote:
> After some work i achieved to get my data to the Points, so I got POINT_DATA
> now. And Surface LIC does it work now. So my first problems are solved. But
> one still remains. The vectors have directions, of course. Out of the
> algorithm  I used to create them there is no chance that all vectors point
> into the same direction and physically that isnt needed. (principal
> stresses) Because of that Surface LIC got me vortexes into the lines where
> they shouldnt be. Is there any possibility to say paraview that the
> direction of the vector field should be ignored?
>
> If no does somebody know a visualization tool that supports that? Maybe with
> a file format as simple as legacy vtk?
>
> Thanks for your help.
>
> Eric
>
> On Mon, Mar 12, 2012 at 8:35 PM, David E DeMarle <dave.demarle at kitware.com>
> wrote:
>>
>> Since your data consists of locally 2D elements (triangles, not gets)
>> you might have better luck with both LIC and streamlines if you first
>> apply the "Surface Vectors" filter. This constrains the vector
>> data such that it is always tangential to the local surface.
>>
>> Also, another option for vector visualization you might try is the
>> Warp be Vector filter, which bends the geometry according to the local
>> vector field.
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909
>>
>>
>>
>> On Fri, Mar 9, 2012 at 7:40 AM, gebbi86 <gebbi86 at googlemail.com> wrote:
>> > Dear all,
>> >
>> > i want to visualize the directions of principle stresses computed by a
>> > finite element solver in paraview. I got the directions of these
>> > stresses as
>> > vectors. I used the legacy vtk file format. I choosed the unstructured
>> > grid
>> > dataset with triangle elements for the grid(as they are in the FE
>> > solver).
>> > For the vectors i choosed CELL_DATA and every cell got an vector. I used
>> > the
>> > glyph filter to visualize these vectors ( CELL CENTERS-> GLYPH), but is
>> > there an other possibility to do that? Not as arrows or so, but to get a
>> > result like streamtracers? Interpolated lines? Streamtracers doesnt work
>> > here, because i think they have a direction and the principle stresses
>> > have
>> > no direction. I tried the Surface LIC representation, but i got no other
>> > result as with the surface representation.
>> > To cut a long story short: I have vectors as CELL_DATA and a
>> > unstructured
>> > grid and i want to visualize them as closed lines over the grid. And not
>> > with the glyph filter, that works but I would prefer this other
>> > representation.
>> > I'm new in paraview so i hope you can help me with this topic and I'm
>> > looking forward for your answers.
>> >
>> > Greetings,
>> > Eric
>> >
>> >
>> >
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