STYLE: Need to make a few functions virtual so that subclasses can override them
STYLE: Need to make a few functions virtual so that subclasses can override them

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