STYLE: add comments to IsPointOccluded.
STYLE: add comments to IsPointOccluded.

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