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The Java 3D™ API Specification Version 0.98
HelloUniverse:
A Java 3DTM API Sample Program
HelloUniverse.java is a simple code fragment that creates a cube, and a behavior object that rotates the cube at a constant rate of
p/120.0 radians per frame.
HelloUniverse.java
public class HelloUniverse extends Applet {
public BranchGroup createSceneGraph() {
// Create the root of the subgraph
BranchGroup objRoot = new BranchGroup();
// Create the transform group node and initialize it to the
// identity. Enable the TRANSFORM_WRITE capability so that
// our behavior code can modify it at runtime. Add it to the
// root of the subgraph.
TransformGroup objTrans = new TransformGroup();
objTrans.setCapability(
TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.addChild(objTrans);
// Create a simple shape leaf node, add it to the scene graph.
objTrans.addChild(new ColorCube().getShape());
// Create a new Behavior object that will perform the desired
// operation on the specified transform object and add it into
// the scene graph.
Transform3D yAxis = new Transform3D();
Alpha rotationAlpha = new Alpha(
-1, Alpha.INCREASING_ENABLE,
0, 0, 4000, 0, 0, 0, 0, 0);
RotationInterpolator rotator = new RotationInterpolator(
rotationAlpha, objTrans, yAxis,
0.0f, (float) Math.PI*2.0f);
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
rotator.setSchedulingBounds(bounds);
objTrans.addChild(rotator);
return objRoot;
}
public HelloUniverse() {
setLayout(new BorderLayout());
Canvas3D c = new Canvas3D();
add("Center", c);
// Create a simple scene and attach it to the virtual universe
BranchGroup scene = createSceneGraph();
UniverseBuilder u = new
UniverseBuilder(c);
u.addBranchGraph(scene);
}
}
public class UniverseBuilder extends Object {
// User-specified canvas
Canvas3D canvas;
// Scene graph elements that the user may want access to
VirtualUniverse universe;
Locale locale;
TransformGroup vpTrans;
View view;
public UniverseBuilder(Canvas3D c) {
this.canvas = c;
// Establish a virtual universe, with a single hi-res Locale
universe = new VirtualUniverse();
locale = new Locale(universe);
// Create a PhysicalBody and Physical Environment object
PhysicalBody body = new PhysicalBody();
PhysicalEnvironment environment = new PhysicalEnvironment();
// Create a View and attach the Canvas3D and the physical
// body and environment to the view. view = new View();
view.addCanvas3D(c);
view.setPhysicalBody(body);
view.setPhysicalEnvironment(environment);
// Create a branch group node for the view platform
BranchGroup vpRoot = new BranchGroup();
// Create a ViewPlatform object, and its associated
// TransformGroup object, and attach it to the root of the
// subgraph. Attach the view to the view platform.
Transform3D t = new Transform3D();
t.set(new Vector3f(0.0f, 0.0f, 5.0f));
ViewPlatform vp = new ViewPlatform();
TransformGroup vpTrans = new TransformGroup(t);
vpTrans.addChild(vp);
vpRoot.addChild(vpTrans);
view.attachViewPlatform(vp);
view.setFieldOfView(40.0 * Math.PI / 180.0);
view.setFrontClipDistance(1.0);
view.setBackClipDistance(10.0);
// Attach the branch graph to the universe, via the Locale.
// The scene graph is now live!
locale.addBranchGraph(vpRoot);
}
public void addBranchGraph(BranchGroup bg) {
locale.addBranchGraph(bg);
}
}
public class ColorCube extends Object {
private static final float[] verts = {
// front face
1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f, -1.0f, -1.0f, 1.0f,
// back face
-1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f,
1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f,
// right face
1.0f, -1.0f, -1.0f, 1.0f, 1.0f, -1.0f,
1.0f, 1.0f, 1.0f, 1.0f, -1.0f, 1.0f,
// left face
-1.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, -1.0f, -1.0f, -1.0f, -1.0f,
// top face
1.0f, 1.0f, 1.0f, 1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f,
// bottom face
-1.0f, -1.0f, 1.0f, -1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f,
};
private static final float[] colors = {
// front face (red)
1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
// back face (green)
0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
// right face (blue)
0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
// left face (yellow)
1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f,
1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f,
// top face (magenta)
1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
// bottom face (cyan)
0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
};
private Shape3D shape;
public ColorCube() {
QuadArray cube = new QuadArray(24, QuadArray.COORDINATES | QuadArray.COLOR_3);
cube.setCoordinates(0, verts);
cube.setColors(0, colors);
shape = new Shape3D(cube, new Appearance());
}
public Shape3D getShape() {
return shape;
}
}
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