Add parallel projection as option.
Add parallel projection as option.

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