[vtkusers] Using Glyphs

[VovaJ at netscape.net]

Hello! I have build an implicit surface using vtkSampleFunction.
   And I extracted an triangulated surface from it using vtkContourFilter.
   vtkContourFilter *contour =vtkContourFilter::New();
   contour->SetInput(spline->GetOutput());
   contour->SetValue(0,0.0);
   Afterwards I try to glue a small Cones to it, using vtkGlyph3D,

          vtkConeSource *cone = vtkConeSource::New(); 
          vtkGlyph3D *glyph = vtkGlyph3D::New();
          glyph->SetInput(deci->GetOutput());
          glyph->SetSource(cone->GetOutput());
          glyph->SetVectorModeToUseNormal();
          glyph->SetScaleModeToScaleByVector();
          glyph->SetScaleFactor(0.20);

   but they are oriented to the inside of the surface, not to outside.
   How can i fix it?
Any help is appretiated!
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