Hi,
I have a problem for displaying a textured quad. The view does not display
anything, and result in a blank screen.
The purpose of my application is to display video frames in the textured quad.
I verified several things, as the texture's image updating, the camera view and
projection matrices, the possibility of viewing a simple box instead of the
textured quad, at its position. All of those operations are working, so I
concluded that there is a problem with my textured quad.
My code looks as follow :
Code:
ClientViewer::initialize()
{
// _renderingFrame is an osg::Image attached to the texture
// it is initialized in an other method
// graphics context initialization
// camera initialization
// _viewer initialization
_texture = new osg::TextureRectangle();
_texture->setTextureSize(_renderingFrame->s(), _renderingFrame->t());
_texture->setImage(_renderingFrame);
osg::ref_ptr<osg::Geometry> quad =
osg::createTexturedQuadGeometry(osg::Vec3(), osg::Vec3(_renderingFrame->s(), 0,
0), osg::Vec3(0, 0, _renderingFrame->t()), 0, 0, 1, 1);
quad->getOrCreateStateSet()->setAttributeAndModes(0, _texture.get(),
osg::StateAttribute::ON);
_videoSupport = new osg::Geode;
_videoSupport->addDrawable(quad.get());
osg::ref_ptr<PositionAttitudeTransform> pat = new
osg::PositionAttitudeTransform();
pat->addChild(_videoSupport);
pat->setPosition(osg::Vec3(0, 0, Z));
_viewer->setSceneData(pat);
_viewer->realize();
}
Then the render method looks as follow :
Code:
ClientViewer::render()
{
// Initialize the image _videoFrame with the video content
// protect copy with mutexes
...
memcpy(_renderingFrame->data(), _videoFrame->data(),
_videoFrame->getImageSizeInBytes());
_renderingFrame->dirty();
// dump _renderingFrame to verify its content
...
_viewer->frame();
// Go back to the rendering loop of the thread
}
The images dumped from the _renderingFrame are good and follows the video
content. Replacing the textured quad with a simple box, show the box in view.
I suppose that there is a compatibility problem between _renderingFrame and
_texture. But I cannot find the problem.
My image is coded as a 24 bits RGB image in GL_UNSIGNED_BYTE.
What can I test to find the problem with the texture ?
Solved my problem, I made a mistake when specifying the height vector. My
texture quad was seen on its profile and so was invisible :( :(
Thank you!
Cheers,
Mike
Code:
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=53869#53869
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