Killer Game Programming in Java

Creating the Scene

Figure 18-3 shows the methods defined in WrapTour3D.

Figure 18-3. WrapTour3D methods

WrapTour3D sets up the checkered floor and lights (similar to previous Wrap classes). However, addBackground() uses a scaled image, and there are three new methods: makeScenery(), addTourist(), and addAlien(). These methods are called by createSceneGraph() to add scenery, obstacles, and sprites to the scene.

The application's scene graph is shown in Figure 18-4. Its details will be explained in subsequent sections.

Figure 18-4. Scene graph for the Tour3D scene

Adding a Background Image

A Java 3D Background node can use a solid color, an image, or a geometric shape (e.g., a sphere or a box) with an image rendered onto it. Here, the application utilizes a picture of a hazy sky, 400 × 400 pixels in size, stored in bigSky.jpg:

    TextureLoader bgTexture = new TextureLoader("models/bigSky.jpg", null);
    Background back = new Background(bgTexture.getImage());
    back.setImageScaleMode(Background.SCALE_FIT_MAX);   // fit the display

    back.setApplicationBounds( bounds );
    sceneBG.addChild( back );

The image is loaded as a texture and then converted to ImageComponent2D form for the Background object. Java 3D 1.3 added several scaling modes to Background; the one employed here scales the image to fit the display ...