BUG: Streamtracer should use a composite data pipeline since it works with composite data

Graphics/vtkStreamTracer.cxx

@@ -40,7 +40,7 @@ PURPOSE.  See the above copyright notice for more information.
 #include "vtkRungeKutta45.h"
 #include "vtkSmartPointer.h"
 
-vtkCxxRevisionMacro(vtkStreamTracer, "1.44");
+vtkCxxRevisionMacro(vtkStreamTracer, "1.45");
 vtkStandardNewMacro(vtkStreamTracer);
 vtkCxxSetObjectMacro(vtkStreamTracer,Integrator,vtkInitialValueProblemSolver);
 vtkCxxSetObjectMacro(vtkStreamTracer,InterpolatorPrototype,vtkInterpolatedVelocityField);
@@ -1415,3 +1415,9 @@ void vtkStreamTracer::PrintSelf(ostream& os, vtkIndent indent)
      << (this->ComputeVorticity ? " On" : " Off") << endl;
   os << indent << "Rotation scale: " << this->RotationScale << endl;
 }
+
+vtkExecutive* vtkStreamTracer::CreateDefaultExecutive()
+{
+  return vtkCompositeDataPipeline::New();
+}
+

Graphics/vtkStreamTracer.h

@@ -70,6 +70,7 @@
 class vtkCompositeDataSet;
 class vtkDataArray;
 class vtkDoubleArray;
+class vtkExecutive;
 class vtkGenericCell;
 class vtkIdList;
 class vtkIntArray;
@@ -292,6 +293,9 @@ protected:
   vtkStreamTracer();
   ~vtkStreamTracer();
 
+  // Create a default executive.
+  virtual vtkExecutive* CreateDefaultExecutive();
+
   // hide the superclass' AddInput() from the user and the compiler
   void AddInput(vtkDataObject *) 
     { vtkErrorMacro( << "AddInput() must be called with a vtkDataSet not a vtkDataObject."); };