[vtkusers] pb trying to input vtkImageData into vtkHedgeHog

[Berk Geveci]

Is imageDim not 3 by any chance?

-Berk

On Thu, 2003-05-15 at 15:01, Thomas Deschamps wrote:
> Hi vtkUsers
> 
> I've tried something different to try to understand what is going on.
> I took the example sgrid.cxx accessible through the vtkHedgeHog doxygen 
> page and I've adapted it to make it the following
> 
> void testHedgehog( vtkImageData * vectorField,
> int dims, // the dimensions
> int imageDim ) // the number of scalar components
> {
>      vtkStructuredGrid *sgrid = vtkStructuredGrid::New();
>      sgrid -> SetDimensions( dims );
> 
>      vtkFloatArray *vectors = vtkFloatArray::New();
>      vectors -> SetNumberOfComponents( imageDim );
>      vectors -> SetNumberOfTuples( dims[0] * dims[1] * dims[2] );
> 
>      vtkPoints *points = vtkPoints::New();
>      points -> Allocate( dims[0] * dims[1] * dims[2] );
> 
>      float x[3],v[3];
> 
>      for( int k = 0,index = 0 ; k < dims[2] ; k++ )
>          for( int j = 0 ; j < dims[1] ; j++ )
>              for( int i = 0 ; i < dims[0] ; i++,index++ )
>              {
>                x[0] = i;
>                x[1] = j;
>                v[0] = vectorField -> GetScalarComponentAsFloat(i,j,k,0);
>                v[1] = vectorField -> GetScalarComponentAsFloat(i,j,k,1);
> 
>                if( imageDim > 2 )
>                {
>                 x[2] = k;
>                 v[2] = vectorField -> GetScalarComponentAsFloat(i,j,k,2);
>                }
> 
>                points -> InsertPoint(index,x);
>                vectors -> InsertTuple(index,v);
>              }
> 
>      sgrid -> SetPoints( points );
>      sgrid -> GetPointData() -> SetVectors( vectors ); <--- first warning
> 
>      vtkHedgeHog * hedgehog = vtkHedgeHog::New();
>      hedgehog -> SetInput( sgrid );
>      hedgehog -> Update();  <---- second error;
> ....
> }
> 
> Now I have several errors:
> 
> Warning: ...
> vtkPointData (0x85bac68): Can not set attribute Vectors. Incorrect 
> number of components.
> 
> ERROR: ...
> vtkHedgeHog (0x85bba70): No vectors in input data
> 
> My vectorField image is correct. I can represent its magnitude easily.
> But I don't understand why it is giving me those errors...
> Thanks
> 
> Thomas (TDeschamps at lbl.gov)
> 
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