On 29/05/2015 04:20, David E DeMarle wrote:
Responses in line.
On Thu, May 14, 2015 at 4:47 AM, Chris Richardson
<[email protected]> wrote:
I guess that leads to the following questions:
1) When will Xdmf3 be used by ParaView?
I want to deprecate Xdmf2 and make Xdmf3 the default the next release.
Because Xdmf3 adds a dependency on boost Xdmf will have to become
optional in ParaView. The Kitware binaries will have it on because we
already Superbuild in boost for the VisItBridge, but other versions
could easily drop it.
2) Does 2D work properly?
I don't think I tested that particular path in Xdmf3. If you can make
a small test dataset which disproves its working, I'll likely be able
to fix it and add it to the regression test suite for Xdmf3 in VTK.
I guess this should work...
<?xml version="1.0" ?>
<!DOCTYPE Xdmf SYSTEM "Xdmf.dtd" []>
<Xdmf Version="2">
<Domain>
<Grid Name="Unnamed">
<Topology Type="TRIANGLE"
Dimensions="1"><DataStructure
DataType="Int"
Dimensions="1 3"
Format="XML">
0 1 2
</DataStructure>
</Topology>
<Geometry Type="XYZ">
<DataStructure
DataType="Float"
Precision="4"
Dimensions="3 3"
Format="XML">
0 0 0
1 0 0
0 1 0
</DataStructure>
</Geometry>
<Set SetType="Edge" Name="Test">
<DataItem NumberType="Int" Dimensions="2" Format="XML">
0 0
</DataItem>
<DataItem NumberType="Int" Dimensions="2" Format="XML">
0 1
</DataItem>
<Attribute Name="Set Values" AttributeType="Scalar"
Center="Edge">
<DataItem Format="XML" Dimensions="2">
1 0
</DataItem>
</Attribute>
</Set>
</Grid>
</Domain>
</Xdmf>
3) What about Attributes which are not in a "Set". The XDMF pages
say this:-
"A Grid centered Attribute might be something like "Material Type"
where the value is constant everywhere in the grid. Edge and Face
centered values are defined, but do not map well to many
visualization systems."
But how do you define Edge and Face centered values for the whole
mesh, anyway?
Not sure I understand the question, much less the answer, but lets
have a go shall we?
Set's can have their own attributes and those attributes can be grid
centered. So if the set has all the edges, then the set's grid
centered attributes apply to all of the edges in the mesh.
OK, I probably confused things by mixing this in. I'll ask it as a
separate question.
4) Finally, is there any real need (in the case below) to go via the
Faces? Maybe, before the standard gets more widespread, this could
be eliminated,
and just go direct from Cell->Edge... OK, this is just a
suggestion...
Could do. I can't think of a reason off the top of my head why vtk's
cell->GetEdge is any less well defined than cell->GetFace()->GetEdge()
and it is probably faster. Maybe that is why the "bug" is there in
xdmf1/2.
Yes, and this should also help to fix point (2) above, since Triangles
don't have Faces, only Edges.
Chris R.
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