On 9/2/2011 2:11 AM, Alessandro Terenzi wrote:
Hi,
I'd like to set the visualization mode to wireframe on iOS, I use these
instructions:
Code:
osg::ref_ptr<osg::StateSet> ss = myModelNode->getOrCreateStateSet();
osg::ref_ptr<osg::PolygonMode> pm;
pm = new osg::PolygonMode(osg::PolygonMode::FRONT_AND_BACK,
osg::PolygonMode::LINE);
ss->setAttributeAndModes(pm.get(), osg::StateAttribute::ON |
osg::StateAttribute::OVERRIDE);
but when the app is running and 'myModelNode' is shown, I keep getting this
warning:
...
Warning: PolygonMode::apply(State&) - not supported.
...
and, of course, the model is drawn as if it is NOT in wireframe.
Am I doing something wrong? Is really PolygonMode not supported on iOS? If so,
how can I change to wireframe mode?
I suspect glPolygonMode is not supported in any flavor of OpenGL ES.
http://www.khronos.org/opengles/
...but you should check the spec.
You could "change to wireframe mode" using a switch and a second scene graph
that renders your geometry as lines. I don't know of an automated way to create
such a scene graph; you might have to write a NodeVisitor to create that for you.
-Paul
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