ENH: Added API to get z buffer at a point.
ENH: Added API to get z buffer at a point.

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