Ok. I will recheck my matlab program which writes the vtk file and get back to you.<br><br>For Paraview, did you mean only the mesh points without the scalar values? I checked the unstructured grid with scalars on them. They look exactly the same as in my VTK code. <br>
<br>Sanket<br><br><div class="gmail_quote">On Fri, Oct 30, 2009 at 7:55 AM, Bill Lorensen <span dir="ltr"><<a href="mailto:bill.lorensen@gmail.com">bill.lorensen@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Perhaps your scalar values are not associated with the proper points?<br>
Have you looked at the original unstructured grid with paraview?<br>
<div><div></div><div class="h5"><br>
On Thu, Oct 29, 2009 at 10:21 PM, Sanket Jain <<a href="mailto:jainsanket1@gmail.com">jainsanket1@gmail.com</a>> wrote:<br>
> Yes, I tried for number of isovalues. But all of them have similar<br>
> characteristics. Is it anything to do with the vtk file being in<br>
> unstructured grid rather than polygonal data? For the mesh, I imported from<br>
> COMSOL, I cannot use polygonal data.<br>
><br>
> Sanket Jain<br>
> On Thu, Oct 29, 2009 at 6:33 PM, Bill Lorensen <<a href="mailto:bill.lorensen@gmail.com">bill.lorensen@gmail.com</a>><br>
> wrote:<br>
>><br>
>> It does look strange. Have you tried changing the isosurface value?<br>
>><br>
>> On Thu, Oct 29, 2009 at 5:44 PM, Sanket Jain <<a href="mailto:jainsanket1@gmail.com">jainsanket1@gmail.com</a>><br>
>> wrote:<br>
>> > I have attached a snapshot of my viewer. The isosurface is predicting<br>
>> > the<br>
>> > volume activated during monopolar stimulation. So, theoretically you<br>
>> > will<br>
>> > expect a sphere at a particular iso value.<br>
>> ><br>
>> > I tried using vtkPolyDataNormals. The figure attached is the output<br>
>> > after<br>
>> > including this filter. But I still think this is not smooth.<br>
>> ><br>
>> > I verified by opening my vtk file in Paraview (with, Compute Normal ON).<br>
>> > Even then i get the same kind of response. So, do you think this is the<br>
>> > best<br>
>> > i can get? Or there might be some problem in the vtk file which is<br>
>> > exported<br>
>> > from COMSOL (I verified it multiple times).<br>
>> ><br>
>> > Thank you,<br>
>> ><br>
>> > Sanket<br>
>> ><br>
>> > On Thu, Oct 29, 2009 at 4:01 PM, Bill Lorensen <<a href="mailto:bill.lorensen@gmail.com">bill.lorensen@gmail.com</a>><br>
>> > wrote:<br>
>> >><br>
>> >> Sorry, reading your e-mail in more detail. Are you generating the<br>
>> >> isosurfaces in vtk using vtkContourFIiter or some equivalent. If so,<br>
>> >> you should run the output through vtkPolyDataNormals.<br>
>> >><br>
>> >> On Thu, Oct 29, 2009 at 4:59 PM, Bill Lorensen<br>
>> >> <<a href="mailto:bill.lorensen@gmail.com">bill.lorensen@gmail.com</a>><br>
>> >> wrote:<br>
>> >> > What do you mean by rough? Perhaps the faces are flat shaded? How are<br>
>> >> > you displaying the model in vtk?<br>
>> >> ><br>
>> >> > Are your isosurfaces composed of only triangles? If so, did you<br>
>> >> > provide surface normals at each point?<br>
>> >> ><br>
>> >> > On Thu, Oct 29, 2009 at 4:30 PM, Sanket Jain <<a href="mailto:jainsanket1@gmail.com">jainsanket1@gmail.com</a>><br>
>> >> > wrote:<br>
>> >> >> Hello Experts,<br>
>> >> >><br>
>> >> >> I have just started to use VTK to fulfill my visualization needs. I<br>
>> >> >> am<br>
>> >> >> trying out few fundamental steps which would be crucial for my<br>
>> >> >> future<br>
>> >> >> development.<br>
>> >> >><br>
>> >> >> I exported an Finite Element Model (FEM) from COMSOL and wrote it<br>
>> >> >> as<br>
>> >> >> vtk<br>
>> >> >> unstructured grid in matlab (points, connections and data). I am<br>
>> >> >> just<br>
>> >> >> trying<br>
>> >> >> to read my vtk file and trying to visualize the isosurfaces at some<br>
>> >> >> value.<br>
>> >> >><br>
>> >> >> The problem is the isosurfaces are very rough even when I increased<br>
>> >> >> the<br>
>> >> >> mesh<br>
>> >> >> density in my COMSOL model. I tried to perform the same task in<br>
>> >> >> paraview and<br>
>> >> >> even there i saw the same problem.<br>
>> >> >><br>
>> >> >> Do you think that increasing the mesh density should solve it? I<br>
>> >> >> cannot<br>
>> >> >> increase the mesh density because of computational issues. Any ideas<br>
>> >> >> on<br>
>> >> >> this<br>
>> >> >> problem will be appreciated.<br>
>> >> >><br>
>> >> >> Thank you,<br>
>> >> >><br>
>> >> >> Sanket Jain<br>
>> >> >><br>
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>> >> >><br>
>> >> >> Please keep messages on-topic and check the VTK FAQ at:<br>
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>> >> >><br>
>> >> >><br>
>> >> ><br>
>> ><br>
>> ><br>
>> ><br>
>> > --<br>
>> > Sanket Jain<br>
>> ><br>
><br>
><br>
><br>
> --<br>
> Sanket Jain<br>
><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br>Sanket Jain<br>