Transform and light
/*
* @(#)LOD.java 1.13 02/10/21 13:44:04
*
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import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.DistanceLOD;
//import javax.media.j3d.LOD;
import javax.media.j3d.Switch;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3f;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.behaviors.vp.OrbitBehavior;
import com.sun.j3d.utils.geometry.Sphere;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.universe.ViewingPlatform;
public class LOD extends Applet {
private SimpleUniverse u = null;
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
createLights(objRoot);
// 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);
objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
objRoot.addChild(objTrans);
// Create a switch to hold the different levels of detail
Switch sw = new Switch(0);
sw.setCapability(javax.media.j3d.Switch.ALLOW_SWITCH_READ);
sw.setCapability(javax.media.j3d.Switch.ALLOW_SWITCH_WRITE);
// Create several levels for the switch, with less detailed
// spheres for the ones which will be used when the sphere is
// further away
sw.addChild(new Sphere(0.4f, Sphere.GENERATE_NORMALS, 40));
sw.addChild(new Sphere(0.4f, Sphere.GENERATE_NORMALS, 20));
sw.addChild(new Sphere(0.4f, Sphere.GENERATE_NORMALS, 10));
sw.addChild(new Sphere(0.4f, Sphere.GENERATE_NORMALS, 3));
// Add the switch to the main group
objTrans.addChild(sw);
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
100.0);
// set up the DistanceLOD behavior
float[] distances = new float[3];
distances[0] = 5.0f;
distances[1] = 10.0f;
distances[2] = 25.0f;
DistanceLOD lod = new DistanceLOD(distances);
lod.addSwitch(sw);
lod.setSchedulingBounds(bounds);
objTrans.addChild(lod);
// Have Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
}
private void createLights(BranchGroup graphRoot) {
// Create a bounds for the light source influence
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
100.0);
// Set up the global, ambient light
Color3f alColor = new Color3f(0.2f, 0.2f, 0.2f);
AmbientLight aLgt = new AmbientLight(alColor);
aLgt.setInfluencingBounds(bounds);
graphRoot.addChild(aLgt);
// Set up the directional (infinite) light source
Color3f lColor1 = new Color3f(0.9f, 0.9f, 0.9f);
Vector3f lDir1 = new Vector3f(1.0f, 1.0f, -1.0f);
DirectionalLight lgt1 = new DirectionalLight(lColor1, lDir1);
lgt1.setInfluencingBounds(bounds);
graphRoot.addChild(lgt1);
}
public LOD() {
}
public void init() {
setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
Canvas3D c = new Canvas3D(config);
add("Center", c);
// Create a simple scene and attach it to the virtual universe
BranchGroup scene = createSceneGraph();
u = new SimpleUniverse(c);
// only add zoom mouse behavior to viewingPlatform
ViewingPlatform viewingPlatform = u.getViewingPlatform();
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
viewingPlatform.setNominalViewingTransform();
// add orbit behavior to the ViewingPlatform, but disable rotate
// and translate
OrbitBehavior orbit = new OrbitBehavior(c, OrbitBehavior.REVERSE_ZOOM
| OrbitBehavior.DISABLE_ROTATE
| OrbitBehavior.DISABLE_TRANSLATE);
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
100.0);
orbit.setSchedulingBounds(bounds);
viewingPlatform.setViewPlatformBehavior(orbit);
u.addBranchGraph(scene);
}
public void destroy() {
u.cleanup();
}
//
// The following allows LOD to be run as an application
// as well as an applet
//
public static void main(String[] args) {
new MainFrame(new LOD(), 512, 512);
}
}
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