[osg-users] Unwanted culling in 3.6.4 vs 3.5.1

[Voerman, L.]

Hi Anders,
I did have a quick look, but I can't see any unwanted culling, nor do I get
the warnings you write about.
tried versions 3.6.3 3.6.4 and 3.6.5 on windows with
OSG_NOTIFY_LEVEL=INFO
osgviewer osg_3.6.4_culled.osgt

Looking in the file I see a lot of empty osg::Text nodes - I guess that
causes an empty bounding sphere in the specific version of osg you have.
Laurens.

On Thu, Jan 9, 2020 at 1:19 PM Anders Backman <andersb at cs.umu.se> wrote:

> Another issue I discovered with 3.6.4 is that we now suddenly get unwanted
> culling.
> At first it looks like a small feature culling thing (which we disable at
> global level with:
>
>   // Don't do small feature culling
>   osg::CullStack::CullingMode cullingMode =
> m_viewer->getCamera()->getCullingMode();
>   cullingMode &= ~(osg::CullStack::SMALL_FEATURE_CULLING);
>   m_viewer->getCamera()->setCullingMode(cullingMode);
>
>
> However, this does not look like a small feature thing to me at all.
> Actually, it culls even when you get close to the objects.
> Attached are two osgt-files.
>
> One is saved from OSG 3.5.1 (works as intended).
>
> Second one is saved from OSG 3.6.4 (where we get the unwanted culling).
>
>
> If you use a later version of OSG (3.6.4) the one from 3.6.4 generates
> lots of warnings:
>
> CullVisitor::apply(Geode&) detected NaN,
>     depth=nan, center=(0 0 7.125),
>     matrix={
>         -nan(ind) -nan(ind) -nan(ind) -nan(ind)
>         -nan(ind) -nan(ind) -nan(ind) -nan(ind)
>         -nan(ind) -nan(ind) -nan(ind) -nan(ind)
>         0.187249 -0.470484 -6.20285 1
>
> whereas the one from 3.5.1 does not.
>
> Anyone give me a hand on this? I am really stuck.
> I was first totally into small feature culling, trying to dig up old code
> where people was trying to disable small feature culling on subgraphs etc.
> But that is not the issue here.
>
> Any suggestion would help. I tried to make the scene as small as possible.
>
> I tried to attach the files, but it made the message too big.
> Instead I shared the files using gofile: https://gofile.io/?c=M5xPmU
> There are two files osg_3.5.1_not_culled.osgt
> and osg_3.6.4_culled.osgt
>
> Thanks,
> Anders
>
>
> --
> __________________________________________
> Anders Backman, HPC2N
> 90187 Umeå University, Sweden
> anders at cs.umu.se http://www.hpc2n.umu.se
> Cell: +46-70-392 64 67
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