[Paraview] Multiblock dataset, ghost nodes and problem with rendering contours with opacity

[Sebastien Jourdain]

Hi Mohamad,

I thought you were working on an unstructured grid. As it is not the
case you shouldn't bother with the array that I talked earlier.
But you should provide the information that each piece is a part of a
whole system and not a set of whole system shown in the same 3d world.

Did you try to specify the WholeExtent to be the Whole system extent
and not the piece one ?

Seb

On Mon, Feb 7, 2011 at 1:44 PM, Mohamad M. Nasr-Azadani
<mmnasr at gmail.com> wrote:
> Hi Seb,
> I did not define any separate array. The only thing that I have done when
> writing the *.vtr file for each subblock is something similar to this
> File0.vtr
> **************************************************
> <?xml version="1.0"?>
> <VTKFile type="RectilinearGrid" version="0.1" byte_order="LittleEndian"
> compressor="vtkZLibDataCompressor">
>   <RectilinearGrid WholeExtent="0 27 0 68 0 135">
>     <Piece Extent="0 27 0 68 0 135">
>       <PointData>
>         <DataArray type="Float32" Name="Conc_0" format="appended" offset="0"
>                   />
>         <DataArray type="Float32" Name="Conc_1" format="appended"
> offset="1221128"             />
>         <DataArray type="Float32" Name="Conc_2" format="appended"
> offset="2406800"             />
>       </PointData>
>       <CellData>
>       </CellData>
>       <Coordinates>
>         <DataArray type="Float32" Name="Array 0x9c7aad8" format="appended"
> offset="3624188"             />
>         <DataArray type="Float32" Name="Array 0x9c79e80" format="appended"
> offset="3624376"             />
>         <DataArray type="Float32" Name="Array 0x9c7ac00" format="appended"
> offset="3624784"             />
>       </Coordinates>
>     </Piece>
>   </RectilinearGrid>
>   <AppendedData encoding="base64">
> ....
> ********************************************************
> File1.vtr
> ********************************************************
> <?xml version="1.0"?>
> <VTKFile type="RectilinearGrid" version="0.1" byte_order="LittleEndian"
> compressor="vtkZLibDataCompressor">
>   <RectilinearGrid WholeExtent="26 54 0 68 0 135">
>     <Piece Extent="26 54 0 68 0 135">
>       <PointData>
>         <DataArray type="Float32" Name="Conc_0" format="appended" offset="0"
>                   />
>         <DataArray type="Float32" Name="Conc_1" format="appended"
> offset="1365196"             />
>         <DataArray type="Float32" Name="Conc_2" format="appended"
> offset="2688228"             />
>       </PointData>
>       <CellData>
>       </CellData>
>       <Coordinates>
>         <DataArray type="Float32" Name="Array 0x9c7aad8" format="appended"
> offset="4047428"             />
>         <DataArray type="Float32" Name="Array 0x9c79e80" format="appended"
> offset="4047624"             />
>         <DataArray type="Float32" Name="Array 0x9c7ac00" format="appended"
> offset="4048032"             />
>       </Coordinates>
>     </Piece>
>   </RectilinearGrid>
>   <AppendedData encoding="base64">
> *****************************************************
> (And many more datafiles similar to this).
> As you can see, the two files have one layer of ghost nodes
> File0.vatr
>   <RectilinearGrid WholeExtent="0 27 0 68 0 135">
> File1.vtr
>   <RectilinearGrid WholeExtent="26 54 0 68 0 135">
>
> Now, I use a *.pvd file to load these files as "part" for each timestep. I
> am not even using a *.pvtr.
> Is it possible to do it the way I am doing it right now or do I need to use
> *.pvtr file?
> Thanks for you help,
> Mohamad
>
> On Sun, Feb 6, 2011 at 6:30 PM, Sebastien Jourdain
> <sebastien.jourdain at kitware.com> wrote:
>>
>> Hi Mohamad,
>>
>> Did you add a data array "GhostLevels" to specify for each cell its
>> ghost level ?
>> It's an unsigned char data array where the values are the depth into
>> the next block for of each cell.
>> By that I mean:
>> - 0 is the cells of the current block
>> - 1 is the set of cells that share points in the current block and the
>> neighbor one.
>>
>> Seb
>>
>> On Sun, Feb 6, 2011 at 12:30 PM, Mohamad M. Nasr-Azadani
>> <mmnasr at gmail.com> wrote:
>> > Hey experts,
>> > I am using several *.vtr files (as subblocks of the entire domain) and
>> > then
>> > use pvd file to load them in paraview.
>> > As I have read in the manual, one needs to use at least one layer of
>> > ghost
>> > nodes on each subblock so that paraview can perform operations on any
>> > given
>> > dataset of that kind.
>> > So far, everything is fine. However, the problem that I have is very
>> > simple
>> > yet annoying. When I use contours to represent the isosurface and then
>> > any
>> > opacity value less than 1.0, I can see the boundaries of each subblock
>> > on
>> > the contour surface. I have not been successful to fix this problem yet.
>> > Any ideas on how to solve this issue?
>> > Thanks,
>> > Mohamad
>> > PS: Attached, please find one snapshot of the contours + the annoying
>> > line
>> > appreaing on the isosurface.
>> >
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