Hi Rafael,
Rafael Sabbagh Armony wrote:
> Hi guys,
>
> one more question about how OpenSG handles things.
>
> How are cameras handled on OpenSG? Is it a node of the graph, is it a
> separate class? Can there be as many cameras as we need? (can we
> instantiate more than one camera?)
> How is its API? I mean, are we able to change any OpenGL parameters for
> the camera from OpenSG?
Cameras are related to the scenegraph but not part of it. The way it works is
that each Viewport (i.e. rectangular piece of a Window) has its own Camera (and
yes, there can be arbitrarily many Viewports per Window and Windows in general,
all with different Cameras and scenegraphs). They can be shared between them,
but they don't have to be. Those Camera objects just define the intrinsic
parameters of the camera, i.e. viewing angle near/far distance, stereo
parameters, CAVE projection parameters etc. Some of these are done via
Decorators to the actual Camera, to allow sharing the Camera between Viewports.
To get the actual position and orientation of the Camera it has a reference to
a
Node in the scenegraph (called the beacon). This can be any Node, but normally
it's a Transform node fairly high up in the graph. You can just change the
transformation of that Node in any regular way to move the camera, or attach it
to a moving object.
If you want to specify everything yourself there is a MatrixCamera that lets
you
can give OpenGL PROJECTION and MODELVIEW matrices. Few people need it, most AR
people that get fully specified matrices from an external tracker.
Hope it helps
Dirk
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