Hi Evan,
Which version of the OSG are you using?
Robert.
On Fri, Apr 10, 2009 at 6:07 PM, Evan Andersen <andersen.e...@gmail.com>wrote:
> I'm working on an application which uses osgEarth to display terrain
> databases to users. I need the application to use as little CPU time as
> possible while still providing good user interaction, so I have set my
> viewer up so that it only renders when necessary. I keep a loop running
> that does the event and update traversals, but the renderingTraversals are
> only done when requestRedraw or requestContinuousUpdate have been called.
> This seems to work fine and to the user it generally beahves the same as
> when the scene is continuously rendered. However, when viewing the high
> detail levels it database pager often gets stuck in a loop when it keeps
> reloading a set of tiles over and over. You see the tiles alternately go
> blurry and then sharp again as the continously reload.
>
> I don't know what is causing this, but if I switch to continuous render, so
> that every event and update traversal is followed by a render, the problem
> does not occur. It seems to happen most often loading earth files with
> high-res data, like the yahoo or google test files, and then moving the
> camera around at the high detail levels. Unfortunately, I can't seem to
> replicate the problem with an animation path. I have attached a simple
> viewer I created that implements the rendering method I described above.
> The important code is in the viewer's frame function. I've pasted it below
> in case anyone can tell at a glance what I'm doing wrong. If someone who
> knows the database pager well could take a look at this I would really
> appreciate it.
>
> Thanks,
> Evan
>
>
> advance(simulationTime);
>
> eventTraversal();
>
> // If the database pager is going to update the scene the render
> flag is
> // set so that the updates show up
> if(getDatabasePager()->requiresUpdateSceneGraph())
> needsRender = true;
>
> updateTraversal();
>
> if(needsRender || continuousUpdate)
> {
> renderingTraversals();
> needsRender = false;
> }
>
>
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>
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