Object Loader Example
/*
* @(#)ObjLoad.java 1.22 02/10/21 13:46:12
*
* Copyright (c) 1996-2002 Sun Microsystems, Inc. All Rights Reserved.
*
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* modification, are permitted provided that the following conditions are met:
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* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
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* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
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* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
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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);
}
}
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