[Paraview] Differences between OpenGL and OpenGL2 versions of ParaView

[Ken Martin]

I took a quick look at it. I see everything from 16 to 111 fps on my laptop
which is a pretty wild range of numbers. I'll do a release build with
OpenGL1 to see what that shows but it will take a while. This dataset is
using the slow path because it has some blocks that have normals and some
that do not. Same idea for tcoords.

I did notice PV is forcing the actor to be modified every time the LOD
changes (which is a lot). Modifying the actor causes the VBO/IBOs to
rebuild so it would be better not to do that unless you really need to and
in this case I'm not sure why it is being done. Specifically I think it is
in vtkPVLODActor::Modified where it calls this->Device->Modified() . The
LOD actor is being modified as a result of calling SetEnableLOD constantly
flipping between true and false. That is not the cause of this issue but it
is something I noticed that will be a pain for large datasets.

Thanks
Ken


On Thu, Nov 19, 2015 at 9:05 AM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> Yes, I am noticing that slowness too. Ken, mind taking a look at that?
>
> Utkarsh
>
>
>
> On Nov 19, 2015, at 12:38 AM, Adam Lyon <lyon at fnal.gov> wrote:
>
> Indeed you are right! I see the rendering you show for 5.0. Interesting
> change with regard to setting the solid color first.
>
> One thing I should note is that image manipulation (pan, zoom, rotate) is
> quite slow in 5.0 compared to 4.4. For example, rotating the ring with a
> solid color, I get frame-rates  (from the annotation text) of over 100 fps
> with 4.4. With 5.0 I generally see about 20-25fps.  Do you see this too?
> Thanks again!! -- Adam
>
> *------*
>
> *Adam L. Lyon*
> *Scientist; Associate Division Head for Systems for Scientific
> Applications*
>
> Scientific Computing Division & Muon g-2 Experiment
> Fermi National Accelerator Laboratory
> 630 840 5522 office
> www.fnal.gov
> lyon at fnal.gov
>
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> On Tue, Nov 17, 2015 at 4:44 PM, Utkarsh Ayachit <
> utkarsh.ayachit at kitware.com> wrote:
>
>> Ken, what Adam has is a multiblock dataset with field data array named
>> "Color" (with certain blocks missing this array). Now when you color by
>> this array and then uncheck "Map Scalars", I get the attached images. I'd
>> contend that 5.0 with OpenGL2 rendering is correct. In 4.4 it would just
>> bleed some random color through for blocks with missing "Color" array. In
>> 5.0, the color used is the "Solid Color" set before changing the array to
>> color with.
>>
>> Adam, are you not seeing rendering as I am with 5.0? I no longer get
>> rendering similar to the images you reported.
>>
>> Utkarsh
>>
>> ​
>>
>
>


-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
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Clifton Park NY 12065
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