[vtkusers] Make Smooth Isosurfaces

[Bill Lorensen]

It does look strange. Have you tried changing the isosurface value?

On Thu, Oct 29, 2009 at 5:44 PM, Sanket Jain <jainsanket1 at gmail.com> wrote:
> I have attached a snapshot of my viewer. The isosurface is predicting the
> volume activated during monopolar stimulation. So, theoretically you will
> expect a sphere at a particular iso value.
>
> I tried using vtkPolyDataNormals. The figure attached is the output after
> including this filter. But I still think this is not smooth.
>
> I verified by opening my vtk file in Paraview (with, Compute Normal ON).
> Even then i get the same kind of response. So, do you think this is the best
> i can get? Or there might be some problem in the vtk file which is exported
> from COMSOL (I verified it multiple times).
>
> Thank you,
>
> Sanket
>
> On Thu, Oct 29, 2009 at 4:01 PM, Bill Lorensen <bill.lorensen at gmail.com>
> wrote:
>>
>> Sorry, reading your e-mail in more detail. Are you generating the
>> isosurfaces in vtk using vtkContourFIiter or some equivalent. If so,
>> you should run the output through vtkPolyDataNormals.
>>
>> On Thu, Oct 29, 2009 at 4:59 PM, Bill Lorensen <bill.lorensen at gmail.com>
>> wrote:
>> > What do you mean by rough? Perhaps the faces are flat shaded? How are
>> > you displaying the model in vtk?
>> >
>> > Are your isosurfaces composed of only triangles? If so, did you
>> > provide surface normals at each point?
>> >
>> > On Thu, Oct 29, 2009 at 4:30 PM, Sanket Jain <jainsanket1 at gmail.com>
>> > wrote:
>> >> Hello Experts,
>> >>
>> >> I have just started to use VTK to fulfill my visualization needs. I am
>> >> trying out few fundamental steps which would be crucial for my future
>> >> development.
>> >>
>> >> I exported an  Finite Element Model (FEM) from COMSOL and wrote it as
>> >> vtk
>> >> unstructured grid in matlab (points, connections and data). I am just
>> >> trying
>> >> to read my vtk file and trying to visualize the isosurfaces at some
>> >> value.
>> >>
>> >> The problem is the isosurfaces are very rough even when I increased the
>> >> mesh
>> >> density in my COMSOL model. I tried to perform the same task in
>> >> paraview and
>> >> even there i saw the same problem.
>> >>
>> >> Do you think that increasing the mesh density should solve it? I cannot
>> >> increase the mesh density because of computational issues. Any ideas on
>> >> this
>> >> problem will be appreciated.
>> >>
>> >> Thank you,
>> >>
>> >> Sanket Jain
>> >>
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>
>
>
> --
> Sanket Jain
>