[osg-users] Bug in osg text in certain circonstance

Robert Osfield robert.osfield at gmail.com
Sat Sep 6 00:46:35 PDT 2008


Hi Cedric,

I get an "403 Forbidden" error on accessing your file:

    http://www.plopbyte.net/tmp/osgText.ogg

Robert.

On Fri, Sep 5, 2008 at 11:33 PM, Cedric Pinson <mornifle at plopbyte.net> wrote:
> Hi guys,
> Strange bug with osgText, with the current configuration:
>
>   std::string fontName = "../data/Vera.ttf";
>   VarsEditor::instance()->get("fontPlayerName", fontName);
>   osgText::Font* font = osgText::readFontFile(fontName.c_str());
>   _seatNumber->setFont(font);
>   _seatNumber->setCharacterSize(25);
>   _seatNumber->setCharacterSizeMode(osgText::Text::SCREEN_COORDS);
>   _seatNumber->setAlignment(osgText::Text::CENTER_CENTER);
>   _seatNumber->setFontResolution(30,30);
>   _seatNumber->setAxisAlignment(osgText::Text::SCREEN);
>   std::stringstream ss;
>   ss << "Seat " << data._seatNumber;
>   _seatNumber->setText(ss.str());
>
> I added a video because i don't how to explain it. A text should be display
> and it is not, it's a bit random, sometimes it works
> sometime it does not. I dump the osg tree and the osgText was in the file,
> then if i re read the file with osgviewer it works.
> I found a trick to make it display again in my application, moving the
> camera very near, then it appears. I don't have any idea appart accusing
> osgText.
> I tried in SingleThreaded and the problem and it does not change.
> I guess it's related to the camera position when i create the text. Because
> i susupect that, i tried a configuration
>
>  std::string fontName = "../data/Vera.ttf";
>   VarsEditor::instance()->get("fontPlayerName", fontName);
>   osgText::Font* font = osgText::readFontFile(fontName.c_str());
>   _seatNumber->setFont(font);
>   _seatNumber->setCharacterSize(0.25);
> //    _seatNumber->setCharacterSizeMode(osgText::Text::SCREEN_COORDS);
>   _seatNumber->setAlignment(osgText::Text::CENTER_CENTER);
>   _seatNumber->setFontResolution(30,30);
>   _seatNumber->setAxisAlignment(osgText::Text::SCREEN);
>   std::stringstream ss;
>   ss << "Seat " << data._seatNumber;
>   _seatNumber->setText(ss.str());
>
> So the character size mode is now the default, and with that i cant
> reproduce the bug. So last information i have is when i create the text the
> text is behind the camera
> so maybe it does not help for the
> _seatNumber->setCharacterSizeMode(osgText::Text::SCREEN_COORDS) mode.
>
> here the video http://www.plopbyte.net/tmp/osgText.ogg
>
> --
> +33 (0) 6 63 20 03 56  Cedric Pinson mailto:mornifle at plopbyte.net
> http://www.plopbyte.net
>
>
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>



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