[osg-users] corrupted rendering

[Robert Osfield]

Hi Laurens,

Good detective work.  Definitely a wired combinational problem.  Could
you post the file that you modified with a note which version it's
based upon.  A git commit/PR would do just as well.

Cheers,
Robert.

On 20 December 2016 at 16:38, Voerman, L. <l.voerman at rug.nl> wrote:
> Hi all,
> this is a very old oddity - stats look a bit weird on a empty scene.
> the actual problem is the osg default for the blend function is never set if
> the main camera renders absolutely nothing, so the opengl default blendfunc
> ( GL_ONE, GL_ZERO) is still active.
> To fix this I added to
> src\osgViewer\StatsHandler.cpp
> in the function setUpScene:
>     stateset->setGlobalDefaults(); // add default blend function
> before the line
>     stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
>
> Regards, Laurens.
>
> On Thu, Dec 15, 2016 at 8:47 PM, Riccardo Corsi <riccardo.corsi at kairos3d.it>
> wrote:
>>
>> Hi Robert,
>>
>> please find attached the hacked viewer which starts also without any
>> loaded model.
>>
>> Here are the details of my setup (even though I've noticed this issue
>> since several osg versions now)
>> - Win10 / VisualStudio 2013
>> - nVidia GTX970 with recent drivers
>> - osg 3.5.3
>>
>> Thank you,
>> Riccardo
>>
>>
>>
>> On Thu, Dec 15, 2016 at 8:16 PM, Robert Osfield <robert.osfield at gmail.com>
>> wrote:
>>>
>>> Hi Riccardo,
>>>
>>> Could you post your modified osgviewer so we can attempt to reduce
>>> things.
>>>
>>> Also please provide details on the OS platform, OSG version, drivers,
>>> hardware as these are all likely to affect the result.
>>>
>>> Robert.
>>>
>>> On 15 December 2016 at 18:44, Riccardo Corsi <riccardo.corsi at kairos3d.it>
>>> wrote:
>>> > Hi all,
>>> >
>>> > I've found out that when I show the stats handler without having set
>>> > any
>>> > data on the viewer,
>>> > its rendering is corrupted (fonts, transparency) - see attached
>>> > screenshot,
>>> > I simply forced osgViewer to run without any loaded model.
>>> >
>>> > The Stats are rendered without being attached to the scene or as a
>>> > slave,
>>> > the stats camera instead is directly added to the first available
>>> > graphics
>>> > context,
>>> > so I'm afraid some initialization is missing.
>>> >
>>> > I have the same problem with another GUI tool I'm rendering with the
>>> > same
>>> > technique.
>>> > Can anybody provide an hint?
>>> > Thank you,
>>> > Riccardo
>>> >
>>> >
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>>> >
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>>> >
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>>
>>
>>
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