output nodal values to vtk
Vladimír Lukeš
you can export only scalar or vector data (using VTK format), but
qstress has dimension 3 while the problem dimension is 2.
Vladimir
On 01/10/2012 07:50 AM, freevryheid wrote:
> I'm getting a 'not implemented' error here. What am I doing wrong?
>
>
>
>
> pb and mesh attached.
>
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freevryheid
Robert Cimrman
> Hi,
> you can export only scalar or vector data (using VTK format), but qstress has
> dimension 3 while the problem dimension is 2.
A little clarification:
One can export scalars and vectors in mesh vertices, and scalars, vectors and
tensors in mesh cells (elements). I will try to fix that.
r.
Robert Cimrman
> I see, thanks. Makes sense now. Just for interest, how are displacements in
> 3d output to vtk i.e. u1, u2, u3?
The displacements are output as vertex data - vectors. Each row corresponds to
a mesh vertex, and is [u1, u2, u3].
r.
Robert Cimrman
> On 01/10/12 08:27, Vladimír Lukeš wrote:
>> Hi,
>> you can export only scalar or vector data (using VTK format), but qstress has
>> dimension 3 while the problem dimension is 2.
>
> A little clarification:
>
> One can export scalars and vectors in mesh vertices, and scalars, vectors and
> tensors in mesh cells (elements). I will try to fix that.
Fixed. Your example works now in the git version.
r.
freevryheid
I'm not seeing a difference between stress (in elements) and qstress (at nodes). I think I need sleep. I'll examine further tomorrow.
a
Robert Cimrman
> Robert, thanks for the fix.
I like easy fixes :)
> I'm not seeing a difference between stress (in elements) and qstress (at
> nodes). I think I need sleep. I'll examine further tomorrow.
Mayavi uses CellToPointData filter to display tensor norm... -> it _should_
look the same!
r.
Robert Cimrman
More info: If you click on the top-left icon, it will open the mayavi VTK
pipeline, so that (i) you can see how the visualisation is done and (ii) you
can edit/modify the pipeline.
In Mayavi (or in VTK in general(?)) some operations/filters are defined only
for point data (in mesh vertices), so the interpolation cell->point must be
done first to be able to apply those operations to cell data.
r.