Hi robert,
True. I do follow the osgHud example. But I am trying to display lat, lon
values as text on mouse move over texture set from buffer. Anyway we use our
own tranformation. But I couldn 't set the transparency. Have a look @ my code
and let me get the mistake i do.
Code:
osg::Camera* createTex()
{
osg::Group* group=new osg::Group;
osg::Geometry *geom;
osg::Camera* camera = new osg::Camera;
camera->setProjectionMatrix(osg::Matrix::ortho2D(0,1920,0,1200));
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera->setViewMatrix(osg::Matrix::identity());
camera->setClearMask(GL_DEPTH_BUFFER_BIT);
camera->setRenderOrder(osg::Camera::POST_RENDER);
camera->setAllowEventFocus(true);
{
osg::Vec3 top_left(0.0f ,0.0f ,1200.0f);
osg::Vec3 bottom_left(0.0f ,0.0f ,0.0f);
osg::Vec3 bottom_right(1920.0f ,0.0f, 0.0f);
osg::Vec3 top_right(1920.0f, 0.0f, 1200.0f);
geom = new osg::Geometry;
osg::Vec3Array* vertices = new osg::Vec3Array(4);
(*vertices)[0] = top_left;
(*vertices)[1] = bottom_left;
(*vertices)[2] = bottom_right;
(*vertices)[3] = top_right;
geom->setVertexArray(vertices);
osg::Vec2Array* texcoords = new osg::Vec2Array(4);
(*texcoords)[0].set(0.0f,1.0f);
(*texcoords)[1].set(0.0f,0.0f);
(*texcoords)[2].set(1.0f,0.0f);
(*texcoords)[3].set(1.0f,1.0f);
geom->setTexCoordArray(0,texcoords);
osg::Vec3Array* normals = new osg::Vec3Array(1);
(*normals)[0].set(0.0f,0.0f,1.0f);
geom->setNormalArray(normals);
geom->setNormalBinding(osg::Geometry::BIND_OVERALL);
osg::Vec4Array* colors = new osg::Vec4Array(1);
(*colors)[0].set(1.0f,1.0f,1.0f,0.2f);
geom->setColorArray(colors);
geom->setColorBinding(osg::Geometry::BIND_OVERALL);
geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS,0,4));
osg::Geode* geom_geode = new osg::Geode;
geom_geode->addDrawable(geom);
texture = new osg::Texture2D;
texture->setName("TEXTURE");
texture->setDataVariance(osg::Object::DYNAMIC);
texture->setResizeNonPowerOfTwoHint(false);
// Setting buffer
osg::Image* image = new osg::Image;
image->setName("BUFFER");
image->setOrigin(osg::Image::BOTTOM_LEFT);
image->setImage(buf_width, buf_height, 1, GL_LUMINANCE,
GL_LUMINANCE, GL_UNSIGNED_BYTE,buf, osg::Image::NO_DELETE);
texture->setImage(image);
osg::StateSet* stateset = geom->getOrCreateStateSet();
stateset->setTextureAttributeAndModes(0,texture,osg::StateAttribute::ON);
stateset->setMode(GL_LIGHTING, osg::StateAttribute::OVERRIDE |
osg::StateAttribute::OFF);
stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
camera->addChild(geom_geode);
}
return camera;
}
osg::Node* createLatLonLabel()
{
osg::Group* root=new osg::Group;
osg::Camera* camera = new osg::Camera;
root->addChild(camera);
camera->setProjectionMatrix(osg::Matrix::ortho2D(0,1920,0,1200));
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera->setViewMatrix(osg::Matrix::identity());
camera->setClearMask(GL_DEPTH_BUFFER_BIT);
camera->setRenderOrder(osg::Camera::POST_RENDER);
camera->setAllowEventFocus(true);
{
osg::Geode* geode = new osg::Geode();
std::string timesFont("fonts/arial.ttf");
osg::StateSet* stateset = geode->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING, osg::StateAttribute::OVERRIDE |
osg::StateAttribute::OFF);
stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
osg::Vec3 position(0.0f,0.0f,0.0f);
{
latLonDisp = new osgText::Text;
geode->addDrawable( latLonDisp );
latLonDisp->setFont(timesFont);
latLonDisp->setCharacterSize(15);
latLonDisp->setFontResolution(25,25);
latLonDisp->setPosition(position);
latLonDisp->setText("(0,0)");
latLonDisp->setAlignment(osgText::Text::CENTER_TOP);
latLonDisp->setAxisAlignment(osgText::Text::XY_PLANE);
}
camera->addChild(geode);
}
return root;
}
main()
{
.....
.............
// Init image buffer
initImage();
// construct the viewer.
osgViewer::CompositeViewer viewer;
osgViewer::Viewer::Windows windows;
// Main View
{
osgViewer::View* view = new osgViewer::View;
viewer.addView(view);
view->setSceneData(createLatLonLabel());
view->setUpViewAcrossAllScreens();
viewer.getWindows(windows);
if (windows.empty()) return 1;
osgGA::TrackballManipulator* tm=new
osgGA::TrackballManipulator;
view->setCameraManipulator(tm);
}
// Create HUD
{
osg::Camera* hudCamera = createTex();
hudCamera->setGraphicsContext(windows[SCREEN_NO]);
hudCamera->setViewport(0,0,windows[SCREEN_NO]->getTraits()->width,
windows[SCREEN_NO]->getTraits()->height);
osgViewer::View* hudView = new osgViewer::View;
hudView->setCamera(hudCamera);
osgGA::TrackballManipulator* tm=new
osgGA::TrackballManipulator();
hudView->setCameraManipulator(tm);
hudView->addEventHandler(new PickModeHandler());
hudView->addEventHandler( new
osgGA::StateSetManipulator(hudView->getCamera()->getOrCreateStateSet()) );
viewer.addView(hudView);
}
}
Thanks
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=26349#26349
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