This article describes a modest 3D game ("Demofox") written for devices running the Android OS. While the scope of this game is limited (it has two levels and no enemies to fight), the code provided does address some difficult issues effectively, particularly in the area of user input.
The objective of game play is to direct a spaceship forward through a continuous series of obstacles (rectangular prisms) without contacting them. Forward flight (positive motion in the "Z" dimension) takes place at all times. The user is able to effect position changes in the X and Y dimensions, within limits. The perspective shown to the user is first person, with the spaceship itself not visible.
Figure 2 below shows a model of the game world. For clarity, this figure is rendered using parallel projection, whereas the game itself uses perspective projection with a vanishing point. As shown, movement is constrained to the interior of a long, tunnel-like rectangular solid of indefinite length in the "Z" dimension.
The obstacles faced by the user are rectangular prisms occupying discrete channels. Prisms reside completely within these channels, of which there are 16 in Figure 2. Though this is not shown in the model, prisms can touch one or more other prisms; more formally, the space between such prisms is zero.
The universe within which movement takes place in the model figure below is four prisms wide by four prisms high. In the real program as supplied, the universe is defined by a 14 x 14 matrix of channels, each of which contains random prisms of constant size, interspersed with the open areas through which the player must direct the spaceship as it moves forward.
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