[vtkusers] Make Smooth Isosurfaces

[Sanket Jain]

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
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