// Our complete lighting example
// Written by Bernie Roehl, October 1999
//
// CONVERTING TO AN APPLET:
// To convert this application into an applet you must construct
// a standard init() method that contains the code now in the VView
// constructor. From within the init() method you will invoke the VRML
// loader's load(URL) method, as the load(String) method currently used
// by this application can't be used in an applet (a security exception
// is thrown by the applet when loading a VRML world from a String).
//
// To convert to an applet, simply rename the following method:
// public VView(String avatar)
// to:
// public void init()
//
// Next, use the applet's getParameter() method to retrieve the
// name of the VRML file to load and place the resulting string into the
// "avatar" variable. The following code assumes that a PARAM named
// "world" is in the corresponding HTML Web page for this applet:
// String avatar = getParameter("world");
//
// Finally, change the VRML loader's load(String) method so that it
// is passed an absolute URL. For example:
// scene = loader.load(new java.net.URL(getCodeBase(), avatar + ".wrl"));
//
// Visit the Core Web3D web site at http://www.CoreWeb3D.com/ to
// obtain code listings from this book, including an applet version of this
// VView program.
import java.awt.*;
import java.applet.Applet;
import java.util.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.loaders.vrml97.VrmlLoader;
import com.sun.j3d.loaders.Scene;
public class VView extends Applet {
      SimpleUniverse universe;   // the universe
      Scene scene = null;        // the VRML scene
VView(String avatar) {
      setLayout(new BorderLayout());
      Canvas3D canvas = new Canvas3D(null);
      add("Center",canvas);
      universe = new SimpleUniverse(canvas);
      ViewingPlatform viewingPlatform =
          universe.getViewingPlatform();
      TransformGroup vpTransGroup =
          viewingPlatform.getViewPlatformTransform();
      View view = (universe.getViewer()).getView();
      VrmlLoader loader = new VrmlLoader();
      try { scene = loader.load(avatar + ".wrl"); }
      catch (Exception e) {
          System.out.println(
                "Exception loading file from path:"
                + avatar + ".wrl");
          System.exit(1);
      }
      // get the scene group from the loaded VRML scene
      BranchGroup sceneGroup = scene.getSceneGroup();
      sceneGroup.setCapability(
          BranchGroup.ALLOW_DETACH);
      sceneGroup.setCapability(
          BranchGroup.ALLOW_BOUNDS_READ);
      // make the VRML scene live
      universe.addBranchGraph(sceneGroup);
      // find the radius and center of the
      // scene's bounding sphere
      BoundingSphere sceneBounds =
          (BoundingSphere)sceneGroup.getBounds();
      double radius = sceneBounds.getRadius();
      Point3d center = new Point3d();
      sceneBounds.getCenter(center);
      // now move the viewpoint back
      // so we can see the whole scene
      Vector3d temp = new Vector3d(center);
      temp.z += 1.4 * radius
               / Math.tan(view.getFieldOfView() / 2.0);
      // set that viewpoint into the viewing transform
      Transform3D viewTransform = new Transform3D();
      viewTransform.set(temp);
      vpTransGroup.setTransform(viewTransform);
      // increase the size of the sceneBounds,
      // for later use
      sceneBounds.setRadius(temp.z * 2.0);
      // create a new BranchGroup to hold the
      // lights, sounds, background, and fog
      BranchGroup environment = new BranchGroup();
      // add a background to the scene
      Background bg = new Background(
               0.0f, 0.75f, 0.25f);
      bg.setApplicationBounds(sceneBounds);
      environment.addChild(bg);
      // create a new DirectionalLight
      // and add it to the scene
      Vector3f direction = new Vector3f(-1f, -1f, -1f);
      Color3f lightColor = new Color3f(1f, 0f, 0f);
      DirectionalLight dirLight =
      new DirectionalLight(lightColor, direction);
      dirLight.setInfluencingBounds(sceneBounds);
      environment.addChild(dirLight);
      // create a new PointLight
      // and add it to the scene
      lightColor = new Color3f(0f, 0f, 1f);
      Point3f position = new Point3f(-2f, 0f, 0f);
      Point3f attenuation = new Point3f(0.5f, 0f, 0f);
      PointLight pointLight =
            new PointLight(lightColor, position,
                  attenuation);
      pointLight.setInfluencingBounds(sceneBounds);
      environment.addChild(pointLight);
      // create a new SpotLight
      // and add it to the scene
      lightColor = new Color3f(1f, 1f, 0f);
      position = new Point3f(0f, 0f, 2f);
      direction = new Vector3f(0f, 0f, -1f);
      attenuation = new Point3f(0f, 0f, 0.5f);
      SpotLight spotLight =
            new SpotLight(lightColor, position,
                   attenuation, direction, 0.47f, 50f);
      spotLight.setInfluencingBounds(sceneBounds);
      environment.addChild(spotLight);
      // create a new AmbientLight
      // and add it to the scene
      lightColor = new Color3f(0f, 1f, 1f);
      AmbientLight ambLight =
             new AmbientLight(lightColor);
      ambLight.setInfluencingBounds(sceneBounds);
      environment.addChild(ambLight);
      universe.addBranchGraph(environment);
      }
      public static void main(String[] args) {
           new MainFrame(new VView(args[0]), 320, 400);
      }
}