/*
* @(#)BlueLitTwistApp.java 1.1 00/09/24 22:37
*
* Copyright (c) 1996-2000 Sun Microsystems, Inc. All Rights Reserved.
*
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* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* 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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*
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*/
/*
* BlueLitTwistApp.java is intended to demonstrate lighting complex surfaces
* A Twist strip is a continuous surface with a complete twist in it.
* (As opposed to a half-twist which would make a Mobius Strip.)
* The Class Twist creates a surface using a TriangleStripArray.
* A Twist strip is placed in a scene graph with a RotationInterpolator
* so the strip spins.
*
* One Twist strip is created using the inner class (Twist).
* This visual object is rendered as filled polygons.
*
* This application (or a version of it) generated one or more
* of the images in Chapter 6 of Getting Started with the Java 3D API.
* The Java 3D Turtorial.
*
* See http://www.sun.com/desktop/java3d/collateral for more information.
*
*/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.event.*;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
public class BlueLitTwistApp extends Applet {
/////////////////////////////////////////////////
//
// create Twist Strip visual object
//
public class Twist extends Shape3D{
////////////////////////////////////////////
//
// create twisted strip subgraph
//
public Twist() {
this.setGeometry(createGeometry());
this.setAppearance(createAppearance());
} // end of Twist constructor
Geometry createGeometry(){
TriangleStripArray twistStrip;
// create triangle strip for Twist
int N = 180;
int stripCounts[] = {N};
twistStrip = new TriangleStripArray(N,
TriangleStripArray.COORDINATES
| TriangleStripArray.NORMALS
| TriangleStripArray.COLOR_3,
stripCounts
);
double a;
int v;
Vector3f norm = new Vector3f();
Color3f color = new Color3f();
for(v = 0, a=0.0; v < N; v+=2, a=v*2.0*Math.PI/(N-2)){
twistStrip.setCoordinate(v, new Point3d(
0.65*Math.cos(a)+0.2*Math.sin(a),
-0.3*Math.cos(a),
0.65*Math.sin(a)+0.2*Math.sin(a)));
twistStrip.setCoordinate(v+1, new Point3d(
0.65*Math.cos(a)-0.2*Math.sin(a),
0.3*Math.cos(a),
0.65*Math.sin(a)-0.2*Math.sin(a)));
norm.set((float) (Math.abs(Math.cos(a))),
(float) Math.abs(Math.sin(a)),
(float) (Math.cos(a)*Math.sin(a)));
norm.normalize();
twistStrip.setNormal(v, norm);
twistStrip.setNormal(v+1, norm);
color.set((float)(Math.cos(a)*Math.cos(a)),
(float)(Math.sin(2*a)*Math.sin(2*a)),
(float)Math.abs(Math.cos(a+1.5)*Math.cos(a+1.5)));
twistStrip.setColor (v,color);
twistStrip.setColor (v,color);
}
return twistStrip;
}
// create Appearance for Twist Strip
//
// this method creates the default Appearance for the
// twist strip. The commented line of code containting
// the setCullFace will fix the problem of half of the
// Twist Strip disappearing.
Appearance createAppearance(){
Appearance twistAppear = new Appearance();
PolygonAttributes polyAttrib = new PolygonAttributes();
polyAttrib.setCullFace(PolygonAttributes.CULL_NONE);
polyAttrib.setBackFaceNormalFlip(true);
twistAppear.setPolygonAttributes(polyAttrib);
Material material = new Material();
twistAppear.setMaterial(material);
return twistAppear;
}
} // end of class Twist
/////////////////////////////////////////////////
//
// create scene graph branch group
//
public BranchGroup createSceneGraph() {
BranchGroup contentRoot = new BranchGroup();
// Create the transform group node and initialize it to the
// identity. Add it to the root of the subgraph.
TransformGroup objSpin = new TransformGroup();
objSpin.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
contentRoot.addChild(objSpin);
Shape3D twist = new Twist();
objSpin.addChild(twist);
Alpha rotationAlpha = new Alpha(-1, 80000);
RotationInterpolator rotator =
new RotationInterpolator(rotationAlpha, objSpin);
// a bounding sphere specifies a region a behavior is active
// create a sphere centered at the origin with radius of 1.5
BoundingSphere bounds = new BoundingSphere();
bounds.setRadius(1.5);
rotator.setSchedulingBounds(bounds);
objSpin.addChild(rotator);
DirectionalLight lightD = new DirectionalLight();
lightD.setInfluencingBounds(bounds);
lightD.setDirection(new Vector3f(.7f, -.7f, -.7f));
contentRoot.addChild(lightD);
DirectionalLight lightD2 = new DirectionalLight();
lightD2.setInfluencingBounds(bounds);
lightD2.setDirection(new Vector3f(.5f, .5f, -.7f));
contentRoot.addChild(lightD2);
Background background = new Background();
background.setColor(1.0f, 1.0f, 1.0f);
background.setApplicationBounds(bounds);
contentRoot.addChild(background);
// Let Java 3D perform optimizations on this scene graph.
// contentRoot.compile();
return contentRoot;
} // end of CreateSceneGraph method of BlueLitTwistApp
// Create a simple scene and attach it to the virtual universe
public BlueLitTwistApp() {
setLayout(new BorderLayout());
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas3D = new Canvas3D(config);
add("Center", canvas3D);
BranchGroup scene = createSceneGraph();
// SimpleUniverse is a Convenience Utility class
SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
simpleU.getViewingPlatform().setNominalViewingTransform();
simpleU.addBranchGraph(scene);
} // end of BlueLitTwistApp constructor
// The following allows this to be run as an application
// as well as an applet
public static void main(String[] args) {
System.out.println("BlueLitTwistApp - Java 3D");
System.out.println("A demonstration of lights.");
Frame frame = new MainFrame(new BlueLitTwistApp(), 256, 256);
} // end of main method of TwistApp
} // end of class BlueLitTwistApp