Performance tweaks to Glyph3D.
Performance tweaks to Glyph3D.

Use batch copies where possible. This reduces the runtime on an
input with ~1M points by 6% (2.41 --> 2.27).

Change-Id: I6bc8de966724064bbb84e857ac35fb74088ef7b4

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