[vtkusers] Contouring (again)

[Robbie Banks]

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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