ENH: Reorganize code and improve comments.
ENH: Reorganize code and improve comments.

hendradarwin/VTK,candy7393/VTK,keithroe/vtkoptix,biddisco/VTK,biddisco/VTK,candy7393/VTK,spthaolt/VTK,demarle/VTK,keithroe/vtkoptix,collects/VTK,jmerkow/VTK,msmolens/VTK,johnkit/vtk-dev,aashish24/VTK-old,hendradarwin/VTK,sankhesh/VTK,jmerkow/VTK,sankhesh/VTK,aashish24/VTK-old,berendkleinhaneveld/VTK,ashray/VTK-EVM,mspark93/VTK,jmerkow/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,aashish24/VTK-old,biddisco/VTK,keithroe/vtkoptix,johnkit/vtk-dev,sumedhasingla/VTK,ashray/VTK-EVM,hendradarwin/VTK,keithroe/vtkoptix,msmolens/VTK,hendradarwin/VTK,demarle/VTK,sankhesh/VTK,msmolens/VTK,berendkleinhaneveld/VTK,aashish24/VTK-old,spthaolt/VTK,ashray/VTK-EVM,aashish24/VTK-old,SimVascular/VTK,sumedhasingla/VTK,SimVascular/VTK,sumedhasingla/VTK,SimVascular/VTK,spthaolt/VTK,collects/VTK,cjh1/VTK,demarle/VTK,collects/VTK,SimVascular/VTK,sumedhasingla/VTK,johnkit/vtk-dev,berendkleinhaneveld/VTK,mspark93/VTK,candy7393/VTK,keithroe/vtkoptix,biddisco/VTK,gram526/VTK,spthaolt/VTK,gram526/VTK,ashray/VTK-EVM,collects/VTK,jmerkow/VTK,jmerkow/VTK,johnkit/vtk-dev,candy7393/VTK,cjh1/VTK,sankhesh/VTK,daviddoria/PointGraphsPhase1,msmolens/VTK,msmolens/VTK,demarle/VTK,johnkit/vtk-dev,ashray/VTK-EVM,keithroe/vtkoptix,berendkleinhaneveld/VTK,mspark93/VTK,johnkit/vtk-dev,ashray/VTK-EVM,sumedhasingla/VTK,hendradarwin/VTK,sumedhasingla/VTK,gram526/VTK,johnkit/vtk-dev,cjh1/VTK,msmolens/VTK,gram526/VTK,collects/VTK,sankhesh/VTK,daviddoria/PointGraphsPhase1,gram526/VTK,demarle/VTK,biddisco/VTK,cjh1/VTK,SimVascular/VTK,sankhesh/VTK,mspark93/VTK,demarle/VTK,mspark93/VTK,mspark93/VTK,collects/VTK,sankhesh/VTK,gram526/VTK,ashray/VTK-EVM,mspark93/VTK,keithroe/vtkoptix,gram526/VTK,jmerkow/VTK,sumedhasingla/VTK,cjh1/VTK,SimVascular/VTK,demarle/VTK,hendradarwin/VTK,sankhesh/VTK,spthaolt/VTK,keithroe/vtkoptix,aashish24/VTK-old,SimVascular/VTK,daviddoria/PointGraphsPhase1,candy7393/VTK,daviddoria/PointGraphsPhase1,candy7393/VTK,cjh1/VTK,msmolens/VTK,candy7393/VTK,SimVascular/VTK,msmolens/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,mspark93/VTK,biddisco/VTK,jmerkow/VTK,spthaolt/VTK,daviddoria/PointGraphsPhase1,demarle/VTK,gram526/VTK,spthaolt/VTK,jmerkow/VTK,candy7393/VTK,biddisco/VTK,ashray/VTK-EVM,daviddoria/PointGraphsPhase1