example6_16.java

书中的例题

/* 导入3D文件 */
import com.sun.j3d.loaders.objectfile.ObjectFile;
import com.sun.j3d.loaders.ParsingErrorException;
import com.sun.j3d.loaders.IncorrectFormatException;
import com.sun.j3d.loaders.Scene;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.io.*;
import com.sun.j3d.utils.behaviors.vp.*;
class Load3d
 {
    private boolean spin = false;
    private boolean noTriangulate = false;
    private boolean noStripify = false;
    private double creaseAngle = 60.0;
    private File filename = null;
    private SimpleUniverse u;
    private BoundingSphere bounds;
	private String str_fileName;

    public BranchGroup createSceneGraph() {
	// 建立构建场景图的根目录对象
	BranchGroup objRoot = new BranchGroup();

        TransformGroup objScale = new TransformGroup();
        Transform3D t3d = new Transform3D();
        t3d.setScale(0.7);
        objScale.setTransform(t3d);
        objRoot.addChild(objScale);

	TransformGroup objTrans = new TransformGroup();
	objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
	objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
	objScale.addChild(objTrans);

	int flags = ObjectFile.RESIZE;
	//if (!noTriangulate) flags |= ObjectFile.TRIANGULATE;
	//if (!noStripify) flags |= ObjectFile.STRIPIFY;
	ObjectFile f = new ObjectFile(flags,(float)(creaseAngle * Math.PI / 180.0));
	Scene s = null;
	try { s=f.load(str_fileName);}
	catch (FileNotFoundException e) {System.exit(1);}
	catch (ParsingErrorException e) {System.exit(1);}
	catch (IncorrectFormatException e) { System.exit(1);	}
	objTrans.addChild(s.getSceneGroup());

    //设置场景的范围
	bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
     //使物体旋转
    if (spin)
	 {
	   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);
	   rotator.setSchedulingBounds(bounds);
	   objTrans.addChild(rotator);
	 } 

     // 设置背景
     Color3f bgColor = new Color3f(0.05f, 0.05f, 0.5f);
     Background bgNode = new Background(bgColor);
     bgNode.setApplicationBounds(bounds);
     objRoot.addChild(bgNode);

	 return objRoot;
    }

  public Load3d() 
	{
	if (filename == null)
	  {
            try {
               filename = new File("galleon.obj");
			   str_fileName=filename.getName();
            } catch (Exception e) { System.exit(1); }
	  }

	BranchGroup scene = createSceneGraph();

    u = new SimpleUniverse();
	
	//在平台上添加鼠标行为
	ViewingPlatform viewingPlatform = u.getViewingPlatform();
    //建立场景面板对象
	PlatformGeometry pg = new PlatformGeometry();

	// 设置环境光源
	Color3f ambientColor = new Color3f(0.9f, 0.9f, 0.9f);
	AmbientLight ambientLightNode = new AmbientLight(ambientColor);
	ambientLightNode.setInfluencingBounds(bounds);
	pg.addChild(ambientLightNode);

	// 设置光源方向
	Color3f light1Color = new Color3f(2.0f, 1.0f, 0.9f);
	Vector3f light1Direction  = new Vector3f(1.0f, 1.0f, 1.0f);
	Color3f light2Color = new Color3f(2.0f, 1.0f, 1.0f);
	Vector3f light2Direction  = new Vector3f(-1.0f, -1.0f, -1.0f);

	DirectionalLight light1
	    = new DirectionalLight(light1Color, light1Direction);
	light1.setInfluencingBounds(bounds);
	pg.addChild(light1);

	DirectionalLight light2
	    = new DirectionalLight(light2Color, light2Direction);
	light2.setInfluencingBounds(bounds);
	pg.addChild(light2);

	viewingPlatform.setPlatformGeometry( pg );
	viewingPlatform.setNominalViewingTransform();
    //设置鼠标控制
	if (!spin) {
            OrbitBehavior orbit = new OrbitBehavior();
            BoundingSphere bounds =
                new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
            orbit.setSchedulingBounds(bounds);
            viewingPlatform.setViewPlatformBehavior(orbit);	    
	}

	u.addBranchGraph(scene);
    }
}

  public class Example6_16 
  {
    public static void main( String[] args ) 
	{  new Load3d();  }
  }