[vtkusers] newbie question

[Bernard Giroux]

Le 06-07-25 à 17:06, Bernard Giroux a écrit :

> Mmmm... Now I get the following error:
>
> Exception in thread "main" java.lang.UnsatisfiedLinkError: Update_50
> 	at vtk.vtkAlgorithm.Update_50(Native Method)
> 	at vtk.vtkAlgorithm.Update(vtkAlgorithm.java:212)
> 	at polymtl.geo.bhgravi.modeling_vtk.TestPolyData.main 
> (TestPolyData.java:41)
>
>
> However, if I don't call Update() and put the lines
>
> 	pts = sphere.GetOutput();
> 	System.out.printf("Number of points: %d\n", pts.GetNumberOfPoints());
> 	System.out.printf("Number of cells: %d\n", pts.GetNumberOfCells());
>
>
> after rendering the actor, I get no error and the following output:
>
> Number of points: 578
> Number of cells: 1152
>
> Can Update() be called explicitely in java?

OK, I got it working.  I added the path location of the library files  
to DYLD_LIBRARY_PATH (this is on OS X) and now I can call Update()  
explicitely.  I wonder how the library was found in the previous case  
though.

Thanks for your help

>
>
> Le 06-07-25 à 16:45, Francois Bertel a écrit :
>
>> Hi Bernard,
>>
>> Before sphere.GetOutput();, call sphere.Update();
>>
>> sphere.SetThetaResolution() and sphere.SetPhiResolution() just  
>> change the value of some protected variable on the SphereSource  
>> object but do not update the output dataset.
>>
>>
>> With the PolyDataMapper, it is done implicitely because it is  
>> triggered by some render event that starts updating the pipeline  
>> (render() is called on the mapper
>> which itself calls update() on its source).
>>
>> Regards.
>>
>> Bernard Giroux wrote:
>>> Hi,
>>>
>>> I am trying to retreive the triangular facets of a sphere created  
>>> using
>>> a vtkSphereSource.  I work in java, and use the following steps:
>>>
>>> public class TestPolyData {
>>>
>>>     static public void main(String[] args) {
>>>         System.loadLibrary("vtkCommonJava");
>>>         System.loadLibrary("vtkFilteringJava");
>>>         System.loadLibrary("vtkIOJava");
>>>         System.loadLibrary("vtkImagingJava");
>>>         System.loadLibrary("vtkGraphicsJava");
>>>         System.loadLibrary("vtkRenderingJava");
>>>         try {
>>>             System.loadLibrary("vtkHybridJava");
>>>         } catch (Throwable e) {
>>>             System.out.println("cannot load vtkHybrid,  
>>> skipping...");
>>>         }
>>>         try {
>>>             System.loadLibrary("vtkVolumeRenderingJava");
>>>         } catch (Throwable e) {
>>>             System.out.println("cannot load vtkVolumeRendering,
>>> skipping...");
>>>         }
>>>
>>>         vtkSphereSource sphere = new vtkSphereSource();
>>>         sphere.SetThetaResolution(36);
>>>         sphere.SetPhiResolution(18);
>>>         vtkPolyData pts = sphere.GetOutput();
>>>
>>>         System.out.printf("Number of points: %d\n",
>>> pts.GetNumberOfPoints());
>>>         System.out.printf("Number of cells: %d\n",  
>>> pts.GetNumberOfCells());
>>>
>>>     }
>>> }
>>>
>>> There must be some steps missing because the output is
>>>
>>> Number of points: 0
>>> Number of cells: 0
>>>
>>> If I pipe the output of the sphere object to a PolyDataMapper an  
>>> then to
>>> an actor, it appears correctly on the screen.
>>>
>>> Any help appreciated.
>>>
>>>
>>> ---
>>> Bernard Giroux, ing., Ph.D.
>>> Associé de recherche
>>>
>>> http://geo.polymtl.ca/~giroux
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> This is the private VTK discussion list.Please keep messages on- 
>>> topic.
>>> Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
>>> Follow this link to subscribe/unsubscribe:
>>> http://www.vtk.org/mailman/listinfo/vtkusers
>>>
>>
>>
>> -- 
>> François Bertel, PhD  | Kitware Inc. Suite 204
>> 1 (518) 371 3971 x113 | 28 Corporate Drive
>>                       | Clifton Park NY 12065, USA
>> _______________________________________________
>> This is the private VTK discussion list.
>> Please keep messages on-topic. Check the FAQ at: http:// 
>> www.vtk.org/Wiki/VTK_FAQ
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>
> ---
> Bernard Giroux, ing., Ph.D.
> Associé de recherche
>
> http://geo.polymtl.ca/~giroux
>
>
>
>
> _______________________________________________
> This is the private VTK discussion list.Please keep messages on- 
> topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers

---
Bernard Giroux, ing., Ph.D.
Associé de recherche

http://geo.polymtl.ca/~giroux