Hello folks!
Last night I started working on adding a few debugging tools to
osgWidget (both for myself, and for people to use in the future) and
what I'm currently trying to do is provide a hotkey that will allow a
user to switch their HUD view from the standard 2D view and "zoom out"
to a fully perspective 3D view. The main reason I want to do this is so
that people can actively view how all of their Windows/Widgets are
"layered" in three dimensions, which will really help me as I finish up
this stratum stuff. :) (Don't you love the word stratum?)
In osgWidget, a WindowManager is simply a subclass of osg::Switch with
overridden childInserted/childRemoved/etc. methods that properly
"transform" an Window object as they are added. More specifically, as
Windows are added, a list is maintained internally and used later as all
the children are enumerated and their Z values are set in an arbitrary
range (though -1.0 - 0.0 is the default, naturally).
Assuming that the WindowManager is placed inside a standard 2D HUD-like
Camera (that is itself a child of some osgViewer::View/osg::View), what
I want to do is grab that Camera and change it to a perspective view.
My first attempt looked something like this:
-------------------------------------------------------------------
osg::Camera* camera = dynamic_cast<osg::Camera*>(getParent(0));
if(!camera) return false;
osg::Matrix m = osg::Matrix::lookAt(
osg::Vec3(0.0f, 3.0f, 10.0f),
osg::Vec3(0.0f, 0.0f, 0.0f),
osg::Vec3(0.0f, 1.0f, 0.0f)
);
camera->setProjectionMatrix(m);
camera->setReferenceFrame(osg::Transform::RELATIVE_RF);
camera->setViewMatrix(osg::Matrix::identity());
camera->setClearMask(GL_DEPTH_BUFFER_BIT);
camera->setRenderOrder(osg::Camera::POST_RENDER);
-------------------------------------------------------------------
...which is close, but not quite right. The biggest issue is that I seem
to be getting some funky, but probably understandable, clipping. :)
What I'm looking for are some guidelines on how I can approach this. I
feel like it should be pretty straightforward, but the fact that I'm
manipulating a camera-within-a-camera (how a POST_RENDER/ABSOLUTEL_RF
HUD works has always been a mystery to me) seems to complicate matters a
bit.
Perhaps I need to approach this differently?
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