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List: vtk-developers
Subject: Re: [vtk-developers] vtkUnstructuredGrid - Not rendering Overlapping Cells
From: Bhanu Hariharan <bhanu () petrotel ! com>
Date: 2013-02-22 17:27:59
Message-ID: CAKBTJ9Ydg1Lkmj8U_r4_jn8CLeY-_z5D6HbXsP-V7YZ4ewEw0A () mail ! gmail ! com
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You guessed it right. I do use a vtkDataSetMapper.
But I am puzzled because I do the exact same thing for a VTKStructuredGrid
- create grid, use threshold filter then a vtkDataSetMapper. In that case
all faces are extracted and rendered.
Maybe vtkDataSetMapper acts differently depending on what its input is?
That is if its input came from a structured grid, render all.
But then again, in my code, vtkDataSetMapper sees the threshold output not
directly the grid.
On Fri, Feb 22, 2013 at 11:13 AM, Will Schroeder <will.schroeder@kitware.com
> wrote:
> I'm guessing that you are using a vtkDataSetMapper (or equivalent) which
> under the hood uses some sort of geometry filter.
>
> When you use different nodes, the boundary operations return the number of
> uses of a face as being <=1 hence a boundary face, and hence rendered. With
> the same nodes, each face is used twice hence is an interior face and not
> extracted, and hence nothing is rendered.
>
> W
>
>
> On Fri, Feb 22, 2013 at 12:03 PM, Bhanu Hariharan <bhanu@petrotel.com>wrote:
>
> > Thanks Will.
> > You are right. In my application, I do use a filter BUT that is a
> > VTKThreshold filter for showing only certain cells.
> > If the two overlapping cells pass this threshold filter, then I don't see
> > them at all (if i use structured grid, then you are right I see something
> > not pretty but I see something).
> >
> > I did not use a VTKDataSetSurface filter. I understand if I used that
> > then only the boundary cells will be rendered.
> > But what I used was just a threshold filter.
> >
> > Infact I created a small ascii file with 2 cells and opened in Paraview
> > as a Legacy VTK file.
> > No filter. I cant see the two cells if ALL NODES ARE IDENTICAL.
> >
> > But if some nodes are identical and some different, then I see some
> > surfaces.
> >
> > Both cases copied here.
> >
> > //===============ALL NODES IDENTICAL=================NOTHING RENDERED
> > # vtk DataFile Version 3.0
> > vtk output
> > ASCII
> > DATASET UNSTRUCTURED_GRID
> > POINTS 8 float
> > 0 0 0
> > 1 0 0
> > 1 1 0
> > 0 1 0
> > 0 0 1
> > 1 0 1
> > 1 1 1
> > 0 1 1
> > CELLS 2 18
> > 8 0 1 3 2 4 5 7 6
> > 8 0 1 3 2 4 5 7 6
> > CELL_TYPES 2
> > 12
> > 12
> >
> >
> > //===============SOME NODES IDENTICAL=================SOME FACES RENDERED
> > # vtk DataFile Version 3.0
> > vtk output
> > ASCII
> > DATASET UNSTRUCTURED_GRID
> > POINTS 10 float
> > 0 0 0
> > 1 0 0
> > 0 1 0
> > 1 1 0
> > 0 0 1
> > 1 0 1
> > 0 1 1
> > 1 1 1
> > 1 1 0
> > 1 1 1
> > CELLS 2 18
> > 8 0 1 3 2 4 5 7 6
> > 8 0 1 8 2 4 5 9 6
> > CELL_TYPES 2
> > 12
> > 12
> >
> >
> > Thanks
> > Bhanu
> >
> >
> >
> >
> > On Fri, Feb 22, 2013 at 10:40 AM, Will Schroeder <
> > will.schroeder@kitware.com> wrote:
> >
> > > Rendering is not the problem. You can render a zillion things on top of
> > > each other. It won't look pretty but you'll see something.
> > >
> > > Probably what is the problem is that you are going through some sort of
> > > geometry filter. For 3D cells, the geometry filter looks at the number of
> > > times each "face" is used by 3D cells. It the number of uses is <=1, then
> > > it's a boundary face and is rendered. If used 2 times, then it's an
> > > interior cell and not extracted (nor rendered).
> > >
> > > W
> > >
> > >
> > > On Fri, Feb 22, 2013 at 10:56 AM, Bhanu Hariharan <bhanu@petrotel.com>wrote:
> > >
> > > > Thanks. I will look into the composite dataset but I do not have
> > > > anything other than hexahedrons.
> > > >
> > > > I think it looks like VTKUnstructuredGrid will not render in the
> > > > situation of overlapping cells and I have to find a way out outside of VTK.
> > > >
> > > >
> > > >
> > > >
> > > > On Fri, Feb 22, 2013 at 9:28 AM, Sebastien Jourdain <
> > > > sebastien.jourdain@kitware.com> wrote:
> > > >
> > > > > VTK has other type of data structure such a composite-dataset /
> > > > > multi-block which let you create a dataset that is composed of multiple
> > > > > dataset (i.e. Unstructured grid in your case).
> > > > > And what you do is basically share the same vtkPoints across all your
> > > > > unstructured grids which will then be gathered by the composite dataset.
> > > > > and rendered as a single dataset.
> > > > >
> > > > > Hope that explain a bit more,
> > > > >
> > > > > Seb
> > > > >
> > > > >
> > > > > On Fri, Feb 22, 2013 at 10:24 AM, Bhanu Hariharan \
> > > > > <bhanu@petrotel.com>wrote:
> > > > > > Sebastian, I do not understand what you mean by multi-block. Could
> > > > > > you please elaborate. Thanks.
> > > > > >
> > > > > >
> > > > > > On Fri, Feb 22, 2013 at 9:20 AM, Sebastien Jourdain <
> > > > > > sebastien.jourdain@kitware.com> wrote:
> > > > > >
> > > > > > > Unless it's a multi-block and then it is not the same dataset
> > > > > > > anymore...
> > > > > > >
> > > > > > >
> > > > > > > On Fri, Feb 22, 2013 at 10:17 AM, Sebastien Jourdain <
> > > > > > > sebastien.jourdain@kitware.com> wrote:
> > > > > > >
> > > > > > > > Then I'm not sure that VTK can handle 2 cells that are based on
> > > > > > > > exactly the same points ID.
> > > > > > > >
> > > > > > > >
> > > > > > > > On Fri, Feb 22, 2013 at 10:12 AM, Bhanu Hariharan <
> > > > > > > > bhanu@petrotel.com> wrote:
> > > > > > > >
> > > > > > > > > Thanks Sebastian. For the 2 cell case, I start with 16 points and
> > > > > > > > > identify duplicates and bring it down to 8 and the two cells now \
> > > > > > > > > map to the same 8 nodes. In this scenario, can VTK render both \
> > > > > > > > > cells with some flags turned on.
> > > > > > > > > Or can you please suggest another way.
> > > > > > > > >
> > > > > > > > > But removing duplicate nodes is a must for my application due to
> > > > > > > > > memory constraints.
> > > > > > > > >
> > > > > > > > > -Bhanu
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > On Fri, Feb 22, 2013 at 9:03 AM, Sebastien Jourdain <
> > > > > > > > > sebastien.jourdain@kitware.com> wrote:
> > > > > > > > >
> > > > > > > > > > duplicate the points.
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > On Fri, Feb 22, 2013 at 9:59 AM, bhanu <bhanu@petrotel.com>wrote:
> > > > > > > > > >
> > > > > > > > > > > Please can anyone answer this query - is this forum active?
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > --
> > > > > > > > > > > View this message in context:
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> > > > > > > > > > > Sent from the VTK - Dev mailing list archive at Nabble.com.
> > > > > > > > > > > _______________________________________________
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> > > >
> > > > _______________________________________________
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> > > --
> > > William J. Schroeder, PhD
> > > Kitware, Inc.
> > > 28 Corporate Drive
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> > > will.schroeder@kitware.com
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> --
> William J. Schroeder, PhD
> Kitware, Inc.
> 28 Corporate Drive
> Clifton Park, NY 12065
> will.schroeder@kitware.com
> http://www.kitware.com
> (518) 881-4902
>
[Attachment #5 (text/html)]
You guessed it right. I do use a vtkDataSetMapper.<br><br>But I am puzzled because I \
do the exact same thing for a VTKStructuredGrid - create grid, use threshold filter \
then a vtkDataSetMapper. In that case all faces are extracted and rendered.<br> \
<br>Maybe vtkDataSetMapper acts differently depending on what its input is?<br>That \
is if its input came from a structured grid, render all.<br><br>But then again, in my \
code, vtkDataSetMapper sees the threshold output not directly the grid.<br> \
<br><br><br><br><div class="gmail_quote">On Fri, Feb 22, 2013 at 11:13 AM, Will \
Schroeder <span dir="ltr"><<a href="mailto:will.schroeder@kitware.com" \
target="_blank">will.schroeder@kitware.com</a>></span> wrote:<br> <blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">I'm guessing that you are using a \
vtkDataSetMapper (or equivalent) which under the hood uses some sort of geometry \
filter.<div> <br></div><div>When you use different nodes, the boundary operations \
return the number of uses of a face as being <=1 hence a boundary face, and hence \
rendered. With the same nodes, each face is used twice hence is an interior face and \
not extracted, and hence nothing is rendered.</div> <span class="HOEnZb"><font \
color="#888888">
<div><br>W</div></font></span></div><div class="HOEnZb"><div class="h5"><div \
class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Feb 22, 2013 at 12:03 \
PM, Bhanu Hariharan <span dir="ltr"><<a href="mailto:bhanu@petrotel.com" \
target="_blank">bhanu@petrotel.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex">Thanks Will.<br>You are right. In my application, I do use a \
filter BUT that is a VTKThreshold filter for showing only certain cells.<br>
If the two overlapping cells pass this threshold filter, then I don't see them at \
all (if i use structured grid, then you are right I see something not pretty but I \
see something).<br> <br>I did not use a VTKDataSetSurface filter. I understand if I \
used that then only the boundary cells will be rendered.<br>But what I used was just \
a threshold filter.<br><br>Infact I created a small ascii file with 2 cells and \
opened in Paraview as a Legacy VTK file.<br>
No filter. I cant see the two cells if ALL NODES ARE IDENTICAL.<br><br>But if some \
nodes are identical and some different, then I see some surfaces.<br><br>Both cases \
copied here.<br><br>//===============ALL NODES IDENTICAL=================NOTHING \
RENDERED<br>
# vtk DataFile Version 3.0<br>vtk output<br>ASCII<br>DATASET \
UNSTRUCTURED_GRID<br>POINTS 8 float<br>0 0 0 <br>1 0 0 <br>1 1 0<br>0 1 0<br>0 0 1 \
<br>1 0 1<br>1 1 1<br>0 1 1<br>CELLS 2 18<br>8 0 1 3 2 4 5 7 6<br>8 0 1 3 2 4 5 7 \
6<br>
CELL_TYPES 2<br>12<br>12<br><br><br>//===============SOME NODES \
IDENTICAL=================SOME FACES RENDERED<br># vtk DataFile Version 3.0<br>vtk \
output<br>ASCII<br>DATASET UNSTRUCTURED_GRID<br>POINTS 10 float<br>0 0 0 <br>
1 0 0 <br>0 1 0<br>1 1 0<br>0 0 1 <br>1 0 1<br>0 1 1<br>1 1 1<br>1 1 0<br>1 1 \
1<br>CELLS 2 18<br>8 0 1 3 2 4 5 7 6<br>8 0 1 8 2 4 5 9 6<br>CELL_TYPES \
2<br>12<br>12<br><br><br>Thanks<span><font color="#888888"><br>
Bhanu</font></span><div><div><br><br><br><br><div class="gmail_quote">
On Fri, Feb 22, 2013 at 10:40 AM, Will Schroeder <span dir="ltr"><<a \
href="mailto:will.schroeder@kitware.com" \
target="_blank">will.schroeder@kitware.com</a>></span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex">
<div dir="ltr">Rendering is not the problem. You can render a zillion things on top \
of each other. It won't look pretty but you'll see \
something.<div><br></div><div>Probably what is the problem is that you are going \
through some sort of geometry filter. For 3D cells, the geometry filter looks at the \
number of times each "face" is used by 3D cells. It the number of uses is \
<=1, then it's a boundary face and is rendered. If used 2 times, then it's \
an interior cell and not extracted (nor rendered).</div>
<div><br></div><div>W</div></div><div class="gmail_extra"><div><div><br><br><div \
class="gmail_quote">On Fri, Feb 22, 2013 at 10:56 AM, Bhanu Hariharan <span \
dir="ltr"><<a href="mailto:bhanu@petrotel.com" \
target="_blank">bhanu@petrotel.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex">Thanks. I will look into the composite dataset but I do not \
have anything other than hexahedrons.<br><br>I think it looks like \
VTKUnstructuredGrid will not render in the situation of overlapping cells and I have \
to find a way out outside of VTK.<div>
<div><br>
<br><br><br><div class="gmail_quote">On Fri, Feb 22, 2013 at 9:28 AM, Sebastien \
Jourdain <span dir="ltr"><<a href="mailto:sebastien.jourdain@kitware.com" \
target="_blank">sebastien.jourdain@kitware.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">VTK has other type of data structure such a \
composite-dataset / multi-block which let you create a dataset that is composed of \
multiple dataset (i.e. Unstructured grid in your case).<div>
And what you do is basically share the same vtkPoints across all your unstructured \
grids which will then be gathered by the composite dataset.</div> <div>and rendered \
as a single dataset.</div><div><br></div><div>Hope that explain a bit \
more,</div><div><br></div><div>Seb</div></div><div><div><div \
class="gmail_extra"><br><br><div class="gmail_quote">
On Fri, Feb 22, 2013 at 10:24 AM, Bhanu Hariharan <span dir="ltr"><<a \
href="mailto:bhanu@petrotel.com" target="_blank">bhanu@petrotel.com</a>></span> \
wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex">
Sebastian, I do not understand what you mean by multi-block. Could you please \
elaborate. Thanks.<div><div><br><br><div class="gmail_quote">On Fri, Feb 22, 2013 at \
9:20 AM, Sebastien Jourdain <span dir="ltr"><<a \
href="mailto:sebastien.jourdain@kitware.com" \
target="_blank">sebastien.jourdain@kitware.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">Unless it's a multi-block and then it is \
not the same dataset anymore...</div><div><div> <div class="gmail_extra"><br><br><div \
class="gmail_quote">On Fri, Feb 22, 2013 at 10:17 AM, Sebastien Jourdain <span \
dir="ltr"><<a href="mailto:sebastien.jourdain@kitware.com" \
target="_blank">sebastien.jourdain@kitware.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">Then I'm not sure that VTK can handle 2 \
cells that are based on exactly the same points ID.</div><div>
<div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Feb 22, 2013 \
at 10:12 AM, Bhanu Hariharan <span dir="ltr"><<a href="mailto:bhanu@petrotel.com" \
target="_blank">bhanu@petrotel.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex">Thanks Sebastian. For the 2 cell case, I start with 16 points \
and identify duplicates and bring it down to 8 and the two cells now map to the same \
8 nodes. In this scenario, can VTK render both cells with some flags turned on.<br>
Or can you please suggest another way.<br><br>But removing duplicate nodes is a must \
for my application due to memory constraints.<span><font \
color="#888888"><br><br>-Bhanu</font></span><div> <div><br><br><div \
class="gmail_quote">On Fri, Feb 22, 2013 at 9:03 AM, Sebastien Jourdain <span \
dir="ltr"><<a href="mailto:sebastien.jourdain@kitware.com" \
target="_blank">sebastien.jourdain@kitware.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">duplicate the points.</div><div><div><div \
class="gmail_extra"><br><br><div class="gmail_quote"> On Fri, Feb 22, 2013 at 9:59 \
AM, bhanu <span dir="ltr"><<a href="mailto:bhanu@petrotel.com" \
target="_blank">bhanu@petrotel.com</a>></span> wrote:<br> <blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex">Please can anyone answer this query - is this forum \
active?<br> <br>
<br>
<br>
--<br>
View this message in context: <a \
href="http://vtk.1045678.n5.nabble.com/vtkUnstructuredGrid-Not-rendering-Overlapping-Cells-tp5718739p5718763.html" \
target="_blank">http://vtk.1045678.n5.nabble.com/vtkUnstructuredGrid-Not-rendering-Overlapping-Cells-tp5718739p5718763.html</a><br>
Sent from the VTK - Dev mailing list archive at Nabble.com.<br>
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