simplelod.java

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//SimpleLOD.java
//演示如何使用DistanceLOD对象
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import com.sun.j3d.utils.applet.MainFrame; 
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;

public class SimpleLOD extends Applet {

	public BranchGroup createSceneGraph() {
		//创建根分支节点
		BranchGroup objRoot = new BranchGroup();
		BoundingSphere bounds = new BoundingSphere();
		//创建一个可移动的组节点
		TransformGroup transTG = new TransformGroup();
		transTG.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		//创建Alpha对象
		Alpha alpha = new Alpha (-1,
								 Alpha.INCREASING_ENABLE + Alpha.DECREASING_ENABLE,
								 0, 0, 5000, 1000, 1000, 5000, 1000, 1000);
		//设置变换的轴
		AxisAngle4f axisOfTra = new AxisAngle4f(0.0f,1.0f,0.0f,(float)Math.PI/-2.0f);
		Transform3D axisT3D = new Transform3D();
		axisT3D.set(axisOfTra);
		//创建位置插值器来实现移动
		PositionInterpolator transPI
			= new PositionInterpolator (alpha, transTG, axisT3D, 0.0f, -35.0f);
		transPI.setSchedulingBounds(bounds);
		//创建目标Switch对象
		Switch targetSwitch = new Switch();
		//设置允许动态变化的能力
		targetSwitch.setCapability(Switch.ALLOW_SWITCH_WRITE);
		//创建几何体
		Appearance sphereApp0 = new Appearance();
		ColoringAttributes sphereCA0 = new ColoringAttributes();
		sphereCA0.setColor(1.0f, 0.0f, 0.0f);
		sphereApp0.setColoringAttributes(sphereCA0);

		Appearance sphereApp1 = new Appearance();
		ColoringAttributes sphereCA1 = new ColoringAttributes();
		sphereCA1.setColor(0.0f, 0.0f, 1.0f);
		sphereApp1.setColoringAttributes(sphereCA1);
		//向Switch中添加几何体
		targetSwitch.addChild(new Sphere(.40f, 0, 25, sphereApp0));
		targetSwitch.addChild(new Sphere(.40f, 0, 15, sphereApp1));
		targetSwitch.addChild(new Sphere(.40f, 0, 10, sphereApp0));
		targetSwitch.addChild(new Sphere(.40f, 0,  4, sphereApp1));
		//创建分界距离
		float[] distances = { 5.0f, 10.0f, 20.0f};
		//创建DistanceLOD对象
		DistanceLOD dLOD = new DistanceLOD(distances, new Point3f());
		dLOD.addSwitch(targetSwitch);
		//设置有效范围
		dLOD.setSchedulingBounds(bounds);
		//
		objRoot.addChild(transTG);     
		objRoot.addChild(transPI);      
		transTG.addChild(dLOD);      
		//不要忘记添加Switch对象到TG上
		transTG.addChild(targetSwitch);
		//设置背景
		Background bg = new Background();
		bg.setColor(1.0f, 1.0f, 1.0f);
		bg.setApplicationBounds(bounds);
		objRoot.addChild(bg);

		//优化
		objRoot.compile();
		return objRoot;
	} 
	public SimpleLOD() {
		setLayout(new BorderLayout());
		Canvas3D canvas3D = new Canvas3D(null);
		add("Center", canvas3D);

		BranchGroup scene = createSceneGraph();
		// SimpleUniverse是一个方便的工具类
		SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
		//向后移动视点，以看清场景内的物体
		simpleU.getViewingPlatform().setNominalViewingTransform();
		simpleU.addBranchGraph(scene);
	} 
	public static void main(String[] args) {
		Frame frame = new MainFrame(new SimpleLOD(), 256, 256);
	} 

}