[vtkusers] slicing a decimated mesh

[John Harris]

Hi there vtk experts,

So I have made a program which takes in an unstructured grid (mesh) as 
input, and depending on the position and orientation of a motion tracker 
that i've incorporated, slices my mesh and displays this on the window.

I've noticed that the resolution of my mesh significantly affects the speed 
at which it slices the mesh. So instead of generating a coarser mesh, I have 
tried decimating my original, fine mesh and then slicing this version to 
display on the window.  Below are the details of the various vtk filters I 
use.

I want to be able to see a slice of my mesh thats "filled in", however I 
only see these jagged-ish lines, an outline only I guess of what I've 
sliced? I've even done MeshOutlineLODActor->GetProperty()->SetColor(0,0,0);
but it still doesnt look filled

Let me know if I shoudl be more clear, maybe I can provide a screenshot if 
this doesnt make full sense,
any help is greatly appreciated!
Thanks!
JH

	GeometryFilter1->SetInput( ourMeshExpert->Ugrid );
	DecimatePro->SetInput( GeometryFilter1->GetOutput() );
	DecimatePro->SetTargetReduction( 0.9 );
	DecimatePro->PreserveTopologyOn();
	PolyDataNormals_orig->SetInput( DecimatePro->GetOutput() );
	PolyDataNormals_orig->ConsistencyOn();
	PolyDataNormals_orig->AutoOrientNormalsOn();
	Delaunay3D->SetInput( PolyDataNormals_orig->GetOutput() );
	Delaunay3D->SetTolerance (0.01);
	Delaunay3D->SetAlpha(0.0);
	Delaunay3D->BoundingTriangulationOff();
	Delaunay3D->Update();
	Delaunay3D->Modified();
	GeometryFilter2->SetInput( Delaunay3D->GetOutput() );

	// slicing:
	MeshSlicingPlane->SetOrigin( o[0], o[1], o[2] );
    	MeshSlicingPlane->SetNormal( v[0],  v[1],  v[2] );
	Cutter->SetCutFunction( MeshSlicingPlane );
       PolyDataMapper_ofMeshOutline->SetInput( Cutter->GetOutput() );
     MeshOutlineLODActor->SetMapper( PolyDataMapper_ofMeshOutline );