[vtkusers] setValue of vtkContourFilter

[Yang, Jinzhong]

You can try method GenerateValues() of vtkContourFilter

You may need to know the range of values of your input data.  Normally it is
the scalar values accessing via input->GetPointData()->GetScalars().

Here "input" is the pointer to your input data.

 

By the way, anybody know how to control the number of points in the output
surface of vtkContourFilter?

 

Thanks,

-Jinzhong

 

From: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] On Behalf
Of Saket Jalan
Sent: Wednesday, June 24, 2009 12:13 AM
To: vtkusers at vtk.org
Subject: [vtkusers] setValue of vtkContourFilter

 

i m not still clear with what i want....

Actually i have some vtk structured point data sets, and i am trying to
generate the isosurface in which i m using contour filter. 
in that i m setting the value of a single contour. My question is how to
decide what would be the value of this variable acc to data set?
Like for one vtk file i found it works when it is 60,,,for second one it
works for 92.....
So how to decide using the program (the source code) the value ?

 

On Wed, Jun 24, 2009 at 12:36 AM, Gerrick Bivins
<gbivins at objectreservoir.com> wrote:

Oh. You're probably over thinking it. No worries! It's not very clear in the
docs.
So for instance, lets say you want to generate 1 contour with a value of
100.
The call would  look like this:
    contour->SetValue(0, 100);

If you wanted to change the value of this contour to 200 your call would be
like this:
    contour->SetValue(0, 200);

Now if you wanted to generate another contour at 50 and keep the contour at
200 (thus totaling 2 contours) , after making the previous call you would
add this:
 
   contour->SetValue(1,50);

So in summary, if you just want one contour the contour number is always 0.
If you want more than one value the contour number is assigned by you and is
<= total number of contours.
 Gerrick






On 6/23/09 1:59 PM, "Saket Jalan" <saaketjalan at gmail.com> wrote:

Thanks for replying...

I m still not able to find out the value of a contour number,,,plss help
i m new to vtk...

Thanks

On Tue, Jun 23, 2009 at 6:33 PM, Gerrick Bivins
<gbivins at objectreservoir.com> wrote:

Hi Saket,
In that method:
 int "i" ==> the contour number 
 double v ==> value of contour number "i"

This is so that you can supply more than one contour value to the contour
filter.
Gerrick



On 6/22/09 7:01 PM, "Saket Jalan" <saaketjalan at gmail.com
<http://saaketjalan@gmail.com> > wrote:

hii...

the class vtkContourFilter.h contains a method called

SetValue(int i, double v);

Anyone please tell me how to decide the value of v while using this
filter.....

Thanks

 





-- 
Saket




-- 
Saket

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