This sounds very much like a problem I had a while ago.  Try this:
http://www.mail-archive.com/osg-users@lists.openscenegraph.org/msg39201.html
--
Terry Welsh  /  mogumbo 'at' gmail.com
www.reallyslick.com  /  www.mogumbo.com



> Message: 9
> Date: Fri, 4 Jun 2010 09:12:24 +0100
> From: Robert Osfield <robert.osfi...@gmail.com>
> To: OpenSceneGraph Users <osg-users@lists.openscenegraph.org>
> Subject: Re: [osg-users] osgText issue
> Message-ID:
>        <aanlktinmxzysh4oach0c5h_c-rrha0ykc5zrrk7fd...@mail.gmail.com>
> Content-Type: text/plain; charset=windows-1252
>
> Hi Brad,
>
> I don't have time right now to dive into this topic, but my guess is
> that the default bounding box for the text is small enough for small
> feature culling to cull it's parent so that the text itself never gets
> traversed.   Perhaps making the bounding volume invalid until it's
> been traversed would be one thing to do, so for the first frame it's
> not culled.  You'd only want to do this in the case of screen scaled
> text.
>
> Robert.
>
> On Fri, Jun 4, 2010 at 12:06 AM, Brad Huber <br...@procerusuav.com> wrote:
>> It looks like for some reason my screen aligned, screen sized text is
>> getting small feature culled under certain circumstances.? My small feature
>> cull is set to the default (2 pixels) and my text is definitely larger than
>> 2 pixels (when it does show).? When I disable small feature culling the text
>> always shows correctly.
>>
>>
>>
>> I?m still not sure why this is happening but is it possible that it is using
>> the world size of my drawables for culling rather than the actual screen
>> size?? Also, I?m not sure why this is an intermittent problem.? (ie text
>> doesn?t show then I zoom in and it shows, then zoom back out and it still
>> shows).
>>
>>
>>
>> Thoughts?
>>
>>
>>
>> Thanks
>>
>> -Brad
>>
>>
>>
>> From: osg-users-boun...@lists.openscenegraph.org
>> [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Brad Huber
>> Sent: Thursday, June 03, 2010 10:02 AM
>> To: 'OpenSceneGraph Users'
>> Subject: [osg-users] osgText issue
>>
>>
>>
>> Cedric (or anyone else),
>>
>>
>>
>> I?m running in to a similar issue to what is described here:
>> http://www.mail-archive.com/osg-users@lists.openscenegraph.org/msg15610.html
>> a long time ago by Cedric Pinson.
>>
>>
>>
>> I searched around in the forum archives and didn?t see any resolution to
>> this issue nor did I find anything else similar.? Did you ever find a
>> solution to this problem?
>>
>>
>>
>> The way it manifests for me is that there is an osgText object in the
>> visible scene but it doesn?t show until I zoom the camera in on it.? Then it
>> appears and if I zoom the camera back out it sticks around. ?It should be
>> showing the whole time?
>>
>>
>>
>>
>>
>> Thanks
>>
>> -Brad
>>
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