added start and end render methods
added start and end render methods

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