[Paraview] Level of Detail (LOD) significantly slower in PV3.9.0 compared to PV3.8.1

[Stefan Melber]

Hi,


i have a bigger case (20e6 points) - there i found the time from 
clicking for e.g. rotation till showing the coarse view (LOD) is nearly 
the same, however from the coarse view back to the detailed one pv 3.9.0 
is about factor of 2-4 slower compared to pv 3.8.1.

My settings of the LOD are:

LOD Threshold (on), 0 MB
LOD Resolution (160x160x160)
Outline Threshold: 0 MCells
LockInteractive Render 0
Allow Rendering Interrupts: off

Output of Timer Log:

3.9.0:

Interactive Render, 3.79491 seconds

Interactive Render,  0.029547 seconds

Still Render,  7.85055 seconds

Still Render,  6.95442 seconds

3.8.1

Interactive Render, 3.73134 seconds

     Execute vtkQuadricClustering id: 371,  3.69637 seconds

     Execute vtkPolyDataMapper id: 166,  3.7e-05 seconds

     OpenGL Dev Render,  0.029671 seconds

         Execute vtkPolyDataMapper id: 41,  1.9e-05 seconds

         Execute vtkPolyDataMapper id: 166,  1.6e-05 seconds

     OpenGL Dev Render,  0.000517 seconds

     OpenGL Dev Render,  1.7e-05 seconds

Interactive Render,  0.014383 seconds

     OpenGL Dev Render,  0.000274 seconds

         Execute vtkPolyDataMapper id: 41,  1.7e-05 seconds

         Execute vtkPolyDataMapper id: 166,  1.6e-05 seconds

     OpenGL Dev Render,  0.00043 seconds

     OpenGL Dev Render,  1.3e-05 seconds

Still Render,  1.19411 seconds

     OpenGL Dev Render,  1.19291 seconds

         Execute vtkPolyDataMapper id: 41,  1.8e-05 seconds

         Execute vtkPolyDataMapper id: 169,  1.7e-05 seconds

     OpenGL Dev Render,  0.000572 seconds

     OpenGL Dev Render,  1.7e-05 seconds



What are the changes between 3.9.0 and 3.8.1 regarding the LOD? Seems, 
3.9.0 is not using OpenGL? I have used the same complier-settings for 
both versions.

If checked the effect with smaller cases - there the effect is smaller.

Best regards,

     Stefan

=================================================================

                                     Stefan Melber-Wilkending
                      _/
                    _/_/             Fields of activities:
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          _/_/_/_/_/_/_/_/_/_/       -) Complex Configurations
        _/    _/    _/    _/         -) Numerical Wind-Tunnel
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                                     German Aerospace Center, DLR
                                     in the Helmholtz-Association
   Phone ..: +49 531/295-2836        Institute of Aerodynamics
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   Email ..: Stefan.Melber at dlr.de    Lilienthalplatz 7
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