ObjLoad.java

package lab10;

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import java.io.FileNotFoundException;
import java.net.MalformedURLException;
import java.net.URL;

import javax.media.j3d.Alpha;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.RotationInterpolator;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3f;

import com.sun.j3d.loaders.IncorrectFormatException;
import com.sun.j3d.loaders.ParsingErrorException;
import com.sun.j3d.loaders.Scene;
import com.sun.j3d.loaders.objectfile.ObjectFile;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.behaviors.vp.OrbitBehavior;
import com.sun.j3d.utils.universe.PlatformGeometry;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.universe.ViewingPlatform;

public class ObjLoad extends Applet {

  private boolean spin = false;

  private boolean noTriangulate = false;

  private boolean noStripify = false;

  private double creaseAngle = 60.0;

  private URL filename = null;

  private SimpleUniverse u;

  private BoundingSphere bounds;

  public BranchGroup createSceneGraph() {
    // Create the root of the branch graph
    BranchGroup objRoot = new BranchGroup();

    // Create a Transformgroup to scale all objects so they
    // appear in the scene.
    TransformGroup objScale = new TransformGroup();
    Transform3D t3d = new Transform3D();
    t3d.setScale(0.7);
    objScale.setTransform(t3d);
    objRoot.addChild(objScale);

    // 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);
    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(filename);
    } catch (FileNotFoundException e) {
      System.err.println(e);
      System.exit(1);
    } catch (ParsingErrorException e) {
      System.err.println(e);
      System.exit(1);
    } catch (IncorrectFormatException e) {
      System.err.println(e);
      System.exit(1);
    }

    objTrans.addChild(s.getSceneGroup());

    bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);

    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);
    }

    // Set up the background
    Color3f bgColor = new Color3f(0.05f, 0.05f, 0.5f);
    Background bgNode = new Background(bgColor);
    bgNode.setApplicationBounds(bounds);
    objRoot.addChild(bgNode);

    return objRoot;
  }

  private void usage() {
    System.out
        .println("Usage: java ObjLoad [-s] [-n] [-t] [-c degrees] <.obj file>");
    System.out.println("  -s Spin (no user interaction)");
    System.out.println("  -n No triangulation");
    System.out.println("  -t No stripification");
    System.out
        .println("  -c Set crease angle for normal generation (default is 60 without");
    System.out
        .println("     smoothing group info, otherwise 180 within smoothing groups)");
    System.exit(0);
  } // End of usage

  public void init() {
    if (filename == null) {
      // Applet
      try {
        URL path = getCodeBase();
        filename = new URL(path.toString() + "./galleon.obj");        
      } catch (MalformedURLException e) {
        System.err.println(e);
        System.exit(1);
      }
    }

    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);

    // add mouse behaviors to the ViewingPlatform
    ViewingPlatform viewingPlatform = u.getViewingPlatform();

    PlatformGeometry pg = new PlatformGeometry();

    // Set up the ambient light
    Color3f ambientColor = new Color3f(0.1f, 0.1f, 0.1f);
    AmbientLight ambientLightNode = new AmbientLight(ambientColor);
    ambientLightNode.setInfluencingBounds(bounds);
    pg.addChild(ambientLightNode);

    // Set up the directional lights
    Color3f light1Color = new Color3f(1.0f, 1.0f, 0.9f);
    Vector3f light1Direction = new Vector3f(1.0f, 1.0f, 1.0f);
    Color3f light2Color = new Color3f(1.0f, 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);

    // This will move the ViewPlatform back a bit so the
    // objects in the scene can be viewed.
    viewingPlatform.setNominalViewingTransform();

    if (!spin) {
      OrbitBehavior orbit = new OrbitBehavior(c,
          OrbitBehavior.REVERSE_ALL);
      BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0,
          0.0), 100.0);
      orbit.setSchedulingBounds(bounds);
      viewingPlatform.setViewPlatformBehavior(orbit);
    }

    u.addBranchGraph(scene);
  }

  // Caled if running as a program
  public ObjLoad(String[] args) {
    if (args.length != 0) {
      for (int i = 0; i < args.length; i++) {
        if (args[i].startsWith("-")) {
          if (args[i].equals("-s")) {
            spin = true;
          } else if (args[i].equals("-n")) {
            noTriangulate = true;
          } else if (args[i].equals("-t")) {
            noStripify = true;
          } else if (args[i].equals("-c")) {
            if (i < args.length - 1) {
              creaseAngle = (new Double(args[++i])).doubleValue();
            } else
              usage();
          } else {
            usage();
          }
        } else {
          try {
            if ((args[i].indexOf("file:") == 0)
                || (args[i].indexOf("http") == 0)) {
              filename = new URL(args[i]);
            } else if (args[i].charAt(0) != '/') {
              filename = new URL("file:./" + args[i]);
            } else {
              filename = new URL("file:" + args[i]);
            }
          } catch (MalformedURLException e) {
            System.err.println(e);
            System.exit(1);
          }
        }
      }
    }
  }

  // Running as an applet
  public ObjLoad() {
  }

  public void destroy() {
    u.cleanup();
  }

  //
  // The following allows ObjLoad to be run as an application
  // as well as an applet
  //
  public static void main(String[] args) {
    new MainFrame(new ObjLoad(args), 700, 700);
  }
}