[osg-users] corrupted rendering

[Voerman, L.]

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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