Hi,
you could also have a look at osg's AutoTransform that does it all for you.
jp
Alan Wills wrote:
Alan wrote:
Hi,
I'm trying to get the screen coordinates of an object in my scene. My aim is to then to overlay the object in the scene with various things in a hud-style orthographic projection, e.g. to cover it with a texture. I am having difficulty in getting it to work. I thought something along the lines of finding
osg::Camera* cam = view->getCamera();
osg::Matrix win = camera->getViewport()->computeWindowMatrix();
osg::Matrix view = camera->getViewMatrix();
osg::Matrix proj = camera->getProjectionMatrix();
osg::Matrix model_mat = model_transform->getMatrix();
and then combining them, but this doesn't work.
Cheers,
Alan
To answer my own question:
osg::Vec3 world_location = ...
osg::Vec3 screen_coords = world_location * view * proj * window
does the job.
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http://forum.openscenegraph.org/viewtopic.php?p=18257#18257
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