java3d 实例_java 3D画图实例

以下是一个简单的Java 3D画图实例，它绘制了一个旋转的立方体：

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;

public class Java3DExample extends Applet {
   public Java3DExample() {
      setLayout(new BorderLayout());
      GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
      Canvas3D canvas = new Canvas3D(config);
      add("Center", canvas);
      BranchGroup scene = createSceneGraph();
      scene.compile();
      SimpleUniverse simpleU = new SimpleUniverse(canvas);
      simpleU.getViewingPlatform().setNominalViewingTransform();
      simpleU.addBranchGraph(scene);
   }

   public BranchGroup createSceneGraph() {
      BranchGroup objRoot = new BranchGroup();
      Transform3D tr = new Transform3D();
      tr.setTranslation(new Vector3f(0.0f, 0.0f, -5.0f));
      objRoot.addChild(new ColorCube(0.4));
      Alpha rotationAlpha = new Alpha(-1, 4000);
      RotationInterpolator rotator = new RotationInterpolator(rotationAlpha, objRoot, tr, 0.0f, (float) Math.PI * 2.0f);
      BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
      rotator.setSchedulingBounds(bounds);
      objRoot.addChild(rotator);
      return objRoot;
   }

   public static void main(String[] args) {
      new MainFrame(new Java3DExample(), 640, 480);
   }
}

这个例子创建了一个Java 3D场景，其中包含一个旋转的彩色立方体。要运行这个例子，请将它保存到名为Java3DExample.java的文件中，并使用Java编译器编译它。然后，从命令行运行以下命令：

appletviewer Java3DExample.java

这将在窗口中显示一个Java 3D场景，您可以在其中旋转和缩放立方体。