Hi all,
I was wanting to use an AutoTransform as a label for 3D elements in my scene.
I have been able to create the Autotransform and add text, etc.
However when I try to draw a line between the position of the autotransform and
the bound of the object, I don't see any line drawn.
I found this puzzling and couldn't figure out why.
Any help on this issue would be much appreciated.
Just to double check: For the purpose of creating labels, is a Billboard more
suitable or an auto transform?
(code realted to autotransform is pasted at the end of my post)
Thanks.
Sincerely,
Sanat
Code:
//create Auto transform to use as a label
osg::ref_ptr<osg::AutoTransform> at1 = new osg::AutoTransform();
osg::Geode* at1Geode = new osg::Geode();
//create txt node
osgText::Text* text1 = new osgText::Text();
text1->setFont("timesFont");
text1->setCharacterSize(30.0);
text1->setText("Pipe1 Owner= DTE");
text1->setAlignment(osgText::Text::CENTER_CENTER);
//add text to geode
at1Geode->addDrawable(text1);
at1->addChild(at1Geode);
//setup auto transform's properties:
at1->setPosition(osg::Vec3d(276377.22, 4685748.0, 1000.0));
at1->setAutoScaleToScreen(true);
at1->setAutoRotateMode(osg::AutoTransform::ROTATE_TO_SCREEN);
//draw line from autotransform to geometry object
//create geode and geometry:
osg::ref_ptr<osg::Geode> lineGeode = new osg::Geode();
osg::Geometry* lineGeometry = new osg::Geometry();
//vertex array
osg::Vec3Array* vertexArray = new osg::Vec3Array(2);
vertexArray->push_back(at1->getPosition());
osg::Vec3 vertex2 = osg::Vec3 (276377.22, 4685748.0, 800.0);
//color array
osg::Vec4Array* colorArray = new osg::Vec4Array(2);
osg::Vec4 yellowColor = osg::Vec4(1.0, 0.0, 0.0, 1.0);
colorArray->push_back(yellowColor);
//add arrays to geometry
lineGeometry->setVertexArray(vertexArray);
lineGeometry->setColorArray(colorArray);
lineGeometry->setColorBinding(osg::Geometry::BIND_OVERALL);
lineGeometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES,
0, vertexArray->size()));
//attach geometry to geode
lineGeode->addDrawable(lineGeometry);
lineGeode->getOrCreateStateSet()->setMode(GL_LIGHTING,
osg::StateAttribute::OFF);
//add the geode to the at1
at1->addChild(lineGeode);
//add pipe1 node to group
group1->addChild(pipe1.get());
group1->addChild(at1.get());
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=37224#37224
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