Graphics Programs Reference
In-Depth Information
are computed relatively to the camera. Then, the
symbols inside the frames are matched to the
marker templates in our AR system, and the virtual
objects associated to the markers are transformed
and aligned to them. The resulting 3D scene is
rendered using both OpenGL and OpenVRML.
ARToolkit overlays the rendered objects on the
video stream displayed to the user.
sions to our current theory, problem, practice and
laboratory classes. That is, we alternate between
using the blackboard, PowerPoint presentations
and other teaching resources, and using structure
analysis using the AR system.
The system allows students to inspect a set of
material structures by moving a maker. The marker
is recognized by ARToolkit. The 3D models of
the material structures are drawn on the markers
when these are recognized by the AR system.
Our system uses a personal computer and
six webcams connected with USB cables and a
concentrator. We organize the students in groups
of two. We give each group a set of markers. The
images captured by the cameras are projected
onto a large screen located in the classroom. That
way, each student can observe and manipulate the
Methodology to Introduce AR into the
Classroom
To apply AR technology to our classes let us first
consider our current methodology. We do not want
to introduce substantial changes to it. Instead, our
goal is to naturally improve our current methodol-
ogy using the AR system. To do so we add AR ses-
Figure 4. Diagram of the procedure that overlays virtual objects on the input video stream
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