[vtkusers] Drawing half a million "vtkParametricEllipsoid"s

[David Doria]

On Wed, May 22, 2013 at 10:54 AM, VoodooCode <MaxSchererMax at gmail.com> wrote:
> I think I almost got it. I created the map, inserted the spheres and if I can
> manipulate each of them independently it should work. Using the actors I can
> rotate and scale the objects, but how to access a single sphere to apply its
> scaling and rotation?
>
> I added a new code snippet.
>
> //Sample start
>
>         vtkSmartPointer<vtkSphereSource> baseSphere =
> vtkSmartPointer<vtkSphereSource>::New();
>         baseSphere->SetRadius(1);
>
>         glyph_->SetInput(polyMap_);
>         glyph_->SetSourceConnection(baseSphere->GetOutputPort());
>         glyph_->Update();
>
>         mapper_->SetInputConnection(glyph_->GetOutputPort());
>         for(int i = 0; i < radius.size(); i++)
>         {
>                 //Configuration of the rotation/translation
>                 vtkSmartPointer<vtkMatrix4x4> transformationMatrix =
> vtkSmartPointer<vtkMatrix4x4>::New();
>                 vtkSmartPointer<vtkMatrixToLinearTransform> matrixToLinearTransform =
> vtkSmartPointer<vtkMatrixToLinearTransform>::New();
>                 configureMatrix(rotation[i], transformationMatrix);
>                 matrixToLinearTransform->SetInput(transformationMatrix);
>                 matrixToLinearTransform->Update();
>
>                 vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
>
>                 actor->SetMapper(???);
>
>                 actor->SetScale(radius.data);
>                 actor->SetUserTransform(matrixToLinearTransform);
>         }
>
> //Sample end

As David mentioned, you need to place the data as PointData. Here are
a couple of glyph filter examples:

http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/ColorGlyphs
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/OrientedGlyphs
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Filtering/Glyph3D

The TensorGlyph example needs some cleaning up/simplification, but
perhaps it will still give you some clues:

http://www.vtk.org/Wiki/VTK/Examples/Broken/TensorGlyph

As usual, when posting code snippets, it is much more helpful if you
can construct a minimal, compilable, self-contained example. We often
lose things like "What type is glyph_ in your previous snippet?"
"Where/Did you set the PointData?", etc.

David