Hi folks,
I am using the z-Buffer in osg 2.4 and have problems getting reasonable values.
When the camera is about two meters away from any flat object surface, I'll get
the value 0.995, and when the camera is about eight meters away i'll get 0.997
from the z buffer. I have also tried to transform the z value into a distance
value, but the distance value makes no sense! Below is my code!
Cheers, Roland
osgViewer::View* view = new osgViewer::View;
viewer.addView(view);
view->setSceneData(root);
view->getCamera()->setProjectionMatrixAsPerspective(V_FoV_deg,V_FoV_deg/H_FoV_deg,1,100);
view->getCamera()->setViewport(new osg::Viewport(traits->width/2,0, 64, 48 ));
view->getCamera()->setGraphicsContext(gc.get());
osg::Image* image = new osg::Image();
view->getCamera()->attach(osg::Camera::DEPTH_BUFFER,image);
image->allocateImage(64,48,1,GL_DEPTH_COMPONENT,GL_FLOAT);
float z;
while( !viewer.done() )
{
viewer.frame();
z = ((float*)pmdimage->data())[1];
std::cout << "z value : " << z << std::endl;
}
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=13976#13976
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