Hi guys,
We're having the same problem here. Textures are corrupted or are
showing the wrong image when the viewer is destroyed and re-created.
I've been tracking it for a week now. Here is the simplified core logic
of the application that shows the problem.
For (;;)
{
{
osgViewer::Viewer viewer();
viewer.setSceneData(scene_data);
viewer.run();
scene_data->releaseGLObjects();
osgDB::Registry::instance()->releaseGLObjects();
}
/* do other stuff */
}
- The problem appears randomly, it's not deterministic.
- The problem appears on all kind of different hardware.
- Destroying all the osg::Texture objects in scene_data after run() (and
re-creating them before run()) seems to solve the problem (note osgText
still appears corrupted.
- Only the textures that were shown during the last frame are corrupted;
all other textures are fine.
I've noticed something really strange once. The debugger stopped with an
assert on an invalid iterator usage. It happened in the graphics thread,
doing the culling. What puzzled me is that the graphic thread was still
running while the main thread is already in the viewer destructor
(thereby causing the culling to iterate over a scene that is no longer
valid). In fact the graphic thread was actively running and doing
culling/drawing after viewer.run() had exited.
Robert, could you confirm that the rendering thread is not supposed to
be actively culling/drawing when being outside of Viewer::run() (or more
precisely, Viewer::frame())?
>From what I understand from Texture.cpp and Texture2D.cpp, if the
graphic thread were to be still running after calling
releaseGLObjects(), the osg::Texture objects would re-create an
osg::Texture::TextureObject (containing the actual OpenGL texture
object) and be left in a state where they think they have a valid
TextureObject. This would explain quite a lot.
Cheers,
Tanguy
-----Original Message-----
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Juan
Casanueva
Sent: 04 May 2009 17:21
To: osg-users@lists.openscenegraph.org
Subject: Re: [osg-users] osgText texture not reloading correctly the
secondtime?
Hi JS,
I think I have exactly the same problem you are having.
I have an application that opens/closes a osg viewer. When I close the
osg viewer, everything gets deleted, even the viewer. However, when I
open the viewer the second time, some of the textures do not appear.
This seems to be happening at random, since the textures that disappear
are not the same ones every time. Sometimes its the terrain textures,
sometimes the clouds, sometimes the 3d models (.ac)... I must say that
the problem does not happen every time on my application. It happens
from time to time, although if I open/close the viewer 3 or 4 times I
eventually end up seeing the problem.
I have no idea what is causing this problem, so I can't really help:(
Just to let you know that it is not happening only on your application
:)
regards
Juan
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=11304#11304
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