[Paraview] Bug? VTK_QUADRATIC_EDGE

[Yuanxin Liu]

Hi, Benoît,

 This is a bug.  We will fix it soon. I have opened a bug based on your
report: http://vtk.org/Bug/view.php?id=13236

 The basic problem is that vertices of high order elements with the same
coordinates are always merged before rending ( by
vtkUnstructuredGridGeometryFilter).  This is not the right behaviour.

thanks for catching it!

Leo



On Mon, Jun 4, 2012 at 1:40 PM, Benoît Pouliot <benoit.pouliot.3 at ulaval.ca>
wrote:
> Hi,
>
> I have an issue with the non-linear cell type VTK_QUADRATIC_EDGE.
> In an unstructured grid, I made two disjoints VTK_QUADRATIC_EDGE with a
SCALARS POINT_DATA (scalar field)
> of value 1.0 on one and 0.0 on the other.
> My problem comes when the two VTK_QUADRATIC_EDGE overlay on one vertex.
> In this case, Paraview seems to transform the discountinuous field in a
continuous one.
>
> To test this issue, I suggest you run my two little tests below. (In
Legacy style)
> I'm wondering if this is a Bug or a normal behavior?
>
> REMARK:
> This issue doesn't appear with the linear cell type VTK_LINE!
>
>
> Thank you for your answers.
> Benoît Pouliot
>
> --------------------------------------------c-----------------
> # vtk DataFile Version 2.0
> Test 1 : disjoints VTK_QUADRATIC_EDGE : one vertex in common
> ASCII
> DATASET UNSTRUCTURED_GRID
> POINTS 6 float
> 0   0   0
> 0.5 0   0
> 1   0   0
> 1   1   0
> .5  0.5 0
> 0   0   0
> CELLS 2 8
> 3 0 2 1
> 3 5 3 4
> CELL_TYPES 2
> 21
> 21
> POINT_DATA 6
> SCALARS scalars float 1
> LOOKUP_TABLE default
> 1.0
> 1.0
> 1.0
> 0.0
> 0.0
> 0.0
> -------------------------------------------------------------
> # vtk DataFile Version 2.0
> Test 2 : disjoints VTK_QUADRATIC_EDGE : no vertex in common
> ASCII
> DATASET UNSTRUCTURED_GRID
> POINTS 6 float
> 0   0   0
> 0.5 0   0
> 1   0   0
> 1   1   0
> .5  0.5 0
> 0.00000000001   0   0
> CELLS 2 8
> 3 0 2 1
> 3 5 3 4
> CELL_TYPES 2
> 21
> 21
> POINT_DATA 6
> SCALARS scalars float 1
> LOOKUP_TABLE default
> 1.0
> 1.0
> 1.0
> 0.0
> 0.0
> 0.0
> -------------------------------------------------------------
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