[osg-users] Slow down with shared nodes

[Andre Normann]

Hi Robert,

some more screenshots. This time without any other model.

3.2.3_1: My application using 3.2.3 and sharing nodes
3.4.0_1: My application using 3.4.0 and sharing nodes
3.4.0_2: My application using 3.4.0 without sharing nodes

Best regards,
André


2017-03-07 17:27 GMT+01:00 Andre Normann <andre.normann at gmail.com>:

> 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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>> > osg-users at lists.openscenegraph.org
>> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-opens
>> cenegraph.org
>> >
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>>
>
>
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