Game Development Reference
In-Depth Information
Working with graphics in AR games
For a better experience and a smoother perception of AR, all the functional elements
should be removed from the screen. The fiducial markers are better kept hidden. This
can be done by covering a marker with a virtual model that looks larger than the
marker. In the simplest case, a planar image with a pattern or pictures can be used.
The smartest way is to imitate a texture of a physical surface by photographing its
fragment and reproducing it several times. For instance, the marker is placed on a
wooden tabletop, then the game takes of photo of the wooden texture, and covers the
marker with fragment of the photo. Of course, such a model is hard to develop and in
many cases, the output can be less than ideal, but it looks very interesting.
It is spectacular to utilize 3D models in AR games; they express the idea of a center
of a game scene better. If the marker defines a position for a character, the model that
hides it is sometimes called a AR 3D puppet, and an inanimate object in turn can be
referred to as an AR 3D Tower.
In most cases, the concept of 3D models in AR games is similar to that of assets in
traditional 3D games; all the principles are the same, that is, rational using of poly-
gons of polygons, simple materials, and good optimization. The only technical claim
is a good color and geometrical contrast with its environment, where textures should
be bright enough to be noticeable on various types of surfaces, both light or dark
and solid or textured. Also, there is no fixed viewpoint for the virtual camera in AR
games; players tilt their device very arbitrarily. Hence, 3D models are beneficial from
any angle. The drawbacks of geometry or texture mapping cannot be swept under
the carpet anymore. Moreover, it is good to think of the design of game elements in
such a way that the game can be played comfortably on both horizontal and vertical
surfaces.
Among other things, AR games do not necessarily need a 3D engine; they can use
flat graphics and spites as well. There should be a good idea behind such a concept.
For instance, a game can be created that uses a physical piece of paper as a game
board, where tiny characters may interact with the text or printed illustrations. Another
Search WWH ::




Custom Search