[osg-users] Slow down with shared nodes

[Andre Normann]

Hi Robert,

I attached two screenshots. As you can see, I am doing nothing fancy here.
There is a VirtualPlanetBuilder model present in the scene, but this model
is hidden for my test case. The test scene contains only some thousand
triangles and I am using a GeForce 1080 which can handle much more.
Currently I have no idea what is going wrong here.

-André


2017-03-07 11:33 GMT+01:00 Robert Osfield <robert.osfield at gmail.com>:

> Hi André,
>
> I can't think of any changes between 3.2.x and 3.4.0 that would cause
> a slow down like you are describing.
>
> The best way to start looking at what might be the cause would be to
> isolate what part of the application is the bottleneck, the first step
> would be to use on the on screen stats and then look at the costs of
> the update, event, cull, draw dispatch and draw GPU phases.
>
> Also have a look at the full stats with to see if there is a different
> number of nodes or state being rendered in the two cases.
>
> Robert.
>
>
>
> On 7 March 2017 at 08:21, Andre Normann <andre.normann at gmail.com> wrote:
> > Hi,
> >
> > I am currently migrating from OpenSceneGraph 3.2.3 to 3.4.0. In my
> > application I get a significant slow down, when I share nodes. Here is a
> > quick example layout of my scenegraph:
> >
> >
> > Parent
> >   |
> >   + ---> MatrixTransform1 --> Node1
> >   |
> >   + ---> MatrixTransform2 --> Node1
> >   |
> >   ...
> >   |
> >   + ---> MatrixTransform3 --> Node1
> >
> > I have a root node with several MatrixTransforms. The nodes below the
> > MatrixTransforms are shared. In 3.2.3 everything works well and I have a
> > framerate of 60 Hz. In 3.4.0 the framerate drops with each new added
> > MatrixTransform. But when I do not share the nodes and instead create
> clones
> > with a DEEP_COPY_ALL flag, everything is well in 3.4.0.
> >
> > So what could cause the slow down in 3.4.0 with node sharing?
> >
> > I am using OpenSceneGraph 3.2.3/3.4.0 with a release build on Window 7.
> >
> >
> > Best regards,
> > André
> >
> >
> > _______________________________________________
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> >
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