[vtkusers] Contouring (again)

[Robbie Banks]

Thanks. Will try that. Thought it was something along those lines

R

On Jul 19, 2010, at 9:05 PM, Bill Lorensen <bill.lorensen at gmail.com>  
wrote:

> 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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