ENH: Limit blur factor to ensure that kernel tails off to zero.
ENH: Limit blur factor to ensure that kernel tails off to zero.

Change-Id: I14355459d618d32c97a83bd4426507af887b74af

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