Allow the user to change the compositing algorithm.
Allow the user to change the compositing algorithm.

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