Creating interpolator behaviors
SphereMotion.java
/*
* @(#)SphereMotion.java 1.28 98/04/09 15:33:38
*
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import java.applet.Applet;
import java.awt.BorderLayout;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.Sphere;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.util.Enumeration;
public class SphereMotion extends Applet {
// Flag indicates whether to use directional or point light
// This flag is set based on command line argument
private static boolean usePointLights = true;
public BranchGroup createSceneGraph(SimpleUniverse u) {
Color3f eColor = new Color3f(0.0f, 0.0f, 0.0f);
Color3f sColor = new Color3f(1.0f, 1.0f, 1.0f);
Color3f objColor = new Color3f(0.6f, 0.6f, 0.6f);
Color3f lColor1 = new Color3f(1.0f, 0.0f, 0.0f);
Color3f lColor2 = new Color3f(0.0f, 1.0f, 0.0f);
Color3f alColor = new Color3f(0.2f, 0.2f, 0.2f);
Color3f bgColor = new Color3f(0.05f, 0.05f, 0.2f);
Transform3D t;
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
// Create a Transformgroup to scale all objects so they
// appear in the scene.
TransformGroup objScale = new TransformGroup();
Transform3D t3d = new Transform3D();
t3d.setScale(0.4);
objScale.setTransform(t3d);
objRoot.addChild(objScale);
// Create a bounds for the background and lights
BoundingSphere bounds =
new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
// Set up the background
Background bg = new Background(bgColor);
bg.setApplicationBounds(bounds);
objScale.addChild(bg);
// Create a Sphere object, generate one copy of the sphere,
// and add it into the scene graph.
Material m = new Material(objColor, eColor, objColor, sColor, 100.0f);
Appearance a = new Appearance();
m.setLightingEnable(true);
a.setMaterial(m);
Sphere sph = new Sphere(1.0f, Sphere.GENERATE_NORMALS, 80, a);
objScale.addChild(sph);
// Create the transform group node for the each light and initialize
// it to the identity. Enable the TRANSFORM_WRITE capability so that
// our behavior code can modify it at runtime. Add them to the root
// of the subgraph.
TransformGroup l1RotTrans = new TransformGroup();
l1RotTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objScale.addChild(l1RotTrans);
TransformGroup l2RotTrans = new TransformGroup();
l2RotTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objScale.addChild(l2RotTrans);
// Create transformations for the positional lights
t = new Transform3D();
Vector3d lPos1 = new Vector3d(0.0, 0.0, 2.0);
t.set(lPos1);
TransformGroup l1Trans = new TransformGroup(t);
l1RotTrans.addChild(l1Trans);
t = new Transform3D();
Vector3d lPos2 = new Vector3d(0.5, 0.8, 2.0);
t.set(lPos2);
TransformGroup l2Trans = new TransformGroup(t);
l2RotTrans.addChild(l2Trans);
// Create Geometry for point lights
ColoringAttributes caL1 = new ColoringAttributes();
ColoringAttributes caL2 = new ColoringAttributes();
caL1.setColor(lColor1);
caL2.setColor(lColor2);
Appearance appL1 = new Appearance();
Appearance appL2 = new Appearance();
appL1.setColoringAttributes(caL1);
appL2.setColoringAttributes(caL2);
l1Trans.addChild(new Sphere(0.05f, appL1));
l2Trans.addChild(new Sphere(0.05f, appL2));
// Create lights
AmbientLight aLgt = new AmbientLight(alColor);
Light lgt1;
Light lgt2;
if (usePointLights) {
Point3f lPoint = new Point3f(0.0f, 0.0f, 0.0f);
Point3f atten = new Point3f(1.0f, 0.0f, 0.0f);
lgt1 = new PointLight(lColor1, lPoint, atten);
lgt2 = new PointLight(lColor2, lPoint, atten);
}
else {
Vector3f lDirect1 = new Vector3f(lPos1);
Vector3f lDirect2 = new Vector3f(lPos2);
lDirect1.negate();
lDirect2.negate();
lgt1 = new DirectionalLight(lColor1, lDirect1);
lgt2 = new DirectionalLight(lColor2, lDirect2);
}
// Set the influencing bounds
aLgt.setInfluencingBounds(bounds);
lgt1.setInfluencingBounds(bounds);
lgt2.setInfluencingBounds(bounds);
// Add the lights into the scene graph
objScale.addChild(aLgt);
l1Trans.addChild(lgt1);
l2Trans.addChild(lgt2);
// 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 rotor1Alpha = new Alpha(-1, Alpha.INCREASING_ENABLE,
0, 0,
4000, 0, 0,
0, 0, 0);
RotationInterpolator rotator1 =
new RotationInterpolator(rotor1Alpha,
l1RotTrans,
yAxis,
0.0f, (float) Math.PI*2.0f);
rotator1.setSchedulingBounds(bounds);
l1RotTrans.addChild(rotator1);
// Create a new Behavior object that will perform the desired
// operation on the specified transform object and add it into the
// scene graph.
Alpha rotor2Alpha = new Alpha(-1, Alpha.INCREASING_ENABLE,
0, 0,
1000, 0, 0,
0, 0, 0);
RotationInterpolator rotator2 =
new RotationInterpolator(rotor2Alpha,
l2RotTrans,
yAxis,
0.0f, 0.0f);
bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
rotator2.setSchedulingBounds(bounds);
l2RotTrans.addChild(rotator2);
// Create a position interpolator and attach it to the view
// platform
TransformGroup vpTrans =
u.getViewingPlatform().getViewPlatformTransform();
Transform3D axisOfTranslation = new Transform3D();
Alpha transAlpha = new Alpha(-1,
Alpha.INCREASING_ENABLE |
Alpha.DECREASING_ENABLE,
0, 0,
5000, 0, 0,
5000, 0, 0);
axisOfTranslation.rotY(-Math.PI/2.0);
PositionInterpolator translator =
new PositionInterpolator(transAlpha,
vpTrans,
axisOfTranslation,
2.0f, 3.5f);
translator.setSchedulingBounds(bounds);
objScale.addChild(translator);
// Let Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
public SphereMotion() {
setLayout(new BorderLayout());
Canvas3D c = new Canvas3D(null);
add("Center", c);
SimpleUniverse u = new SimpleUniverse(c);
BranchGroup scene = createSceneGraph(u);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
u.getViewingPlatform().setNominalViewingTransform();
u.addBranchGraph(scene);
}
//
// The following allows SphereMotion to be run as an application
// as well as an applet
//
public static void main(String[] args) {
// Parse the Input Arguments
String usage = "Usage: java SphereMotion [-point | -dir]";
for (int i = 0; i < args.length; i++) {
if (args[i].startsWith("-")) {
if (args[i].equals("-point")) {
System.out.println("Using point lights");
usePointLights = true;
}
else if (args[i].equals("-dir")) {
System.out.println("Using directional lights");
usePointLights = false;
}
else {
System.out.println(usage);
System.exit(0);
}
}
else {
System.out.println(usage);
System.exit(0);
}
}
new MainFrame(new SphereMotion(), 640, 480);
}
}