Hi Charama??
Perhaps the osgthirdpersonview example
(OpenSceneGraph/examples/osgthirdpersonview/osgthirdpersonview.cpp)
would be appropriate as this creates a third personal view of the main
interactive view with the third person view showing the view frustum
on the main view as a wireframe.
Robert.
On 14 September 2012 10:36, Charma Man motoko_kusan...@web.de wrote:
Hello Forum,
I am an absolute osg-beginner. I am currently working on a very huge project
which is using osg. I now would like to draw something in the existing scene
without messing everything up. I will try to give you as much detail as I can
to make it easier to understand.
I have access to a callback-function which is called before every frame
drawing. Also I have access to the two matices
Code:
this-rootTransform = opencover::cover-getObjectsXform()-getMatrix();
// Get camera frustum parameters
osg::Matrix matProj =
opencover::coVRConfig::instance()-screens[0].camera-getProjectionMatrix();
matProj.getFrustum(
this-frustum.left,
this-frustum.right,
this-frustum.bottom,
this-frustum.top,
this-frustum.znear,
this-frustum.zfar
);
As you probably see the call opencover::coVRConfig::instance() also returns
the instance. What I would like to do now is draw some simple lines (as in
like glBegin) but in screen coordinates, so with positions in the frustum
corners like (1,1,1) or (1,-1,-1).
The reason for this is that I want to make the whole frustum visible
because I am using a stereoscopic VR-renderer and I want to validiate how big
the frustum is and when do you step into the 3D scene.
I hope anyone can help me with this and can provide some simple sample code.
If you need more detail, feel free to ask back.
Thank you!
Cheers,
Charma
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=50045#50045
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