[vtkusers] Contouring (again)

[Bill Lorensen]

Run the contour filter directly on the rectilinear grid. The PolyData
is not a volumetric model.

On Mon, Jul 19, 2010 at 11:59 PM, Robbie Banks <robbie.banks at gmail.com> wrote:
> Sorry, I did have it at 0.25 of the max scalar value. Just didn't add in the
> email
>
> R
>
> On Jul 19, 2010, at 8:45 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>
>> Setting the isosurface value to the maximum of your scalars seems
>> strange. Try setting to another value, e.g. .75*range[1];
>>
>>
>> On Mon, Jul 19, 2010 at 8:52 PM, Robbie Banks <robbie.banks at gmail.com>
>> wrote:
>>>
>>> Hi all,
>>>
>>> Sorry to bring up contouring again, but I have a little problem.
>>>
>>> I have created a PolyDataMapper from a RectilinearGrid in 3D, each point
>>> has
>>> a location and a scalar value associated with it. I wish to create a
>>> Contour
>>> filter to create an isosurface in the plot for a given scalar value.
>>>
>>> I create the contour filter and read in the data like below:
>>>
>>>       vtkSmartPointer<vtkContourFilter> pContourFilter =
>>> vtkSmartPointer<vtkContourFilter>::New();
>>>       pContourFilter->SetInput(pActor->GetMapper()->GetInput());
>>>       double range[2];
>>>       pActor->GetMapper()->GetInput()-GetScalarRange(range);
>>>       pContourFilter->SetValue(0,range[1]);
>>>
>>>       vtkSmartPointer<vtkPolyDataMapper> pMapper =
>>> vtkSmartPointer<vtkPolyDataMapper>::New();
>>>       pMapper->SetInputConnection(pContourFilter->GetOutputPort());
>>>
>>>       etc.....
>>>
>>> This forms a single line round the outside of the volume at the value
>>> specified. However, as stated I'm after a contour surface. Where am I
>>> going
>>> wrong?
>>>
>>> Is the GetMapper()->GetInput() only returning the outer values of the
>>> PolyData.
>>>
>>> How can I create the whole surface?
>>>
>>> Thanks
>>> Robbie
>>>
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>