Mega Code Archive
The use of the GeometryInfo class and related classes
<![CDATA[
/*
* GeomInfoApp.java 1.0 99/02/19
*
* Copyright (c) 1999 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* 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
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear facility.
* Licensee represents and warrants that it will not use or redistribute the
* Software for such purposes.
*/
/*
* GeomInfoApp.java demonstrates the use of the GeometryInfo class and related
* classes.
*
* This program creates a car shape (not a fancy car, though) using GeometryInfo
* objects. One GeometryInfo object specifies the side of the car using a
* polygon (not a triangle, nor a quad). The GeometryInfo and other classes
* convert the polygons into a triangle strips with normals.
*
* Note that about half of the source code just specifies the input data to the
* GeometryInfo objects. The interesting part starts around line 210.
*
* An alternative data set is provided (in the comments) for further
* experimentation - see the tutorial text.
*/
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import javax.media.j3d.Alpha;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.Appearance;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.ColoringAttributes;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.LineArray;
import javax.media.j3d.LineAttributes;
import javax.media.j3d.LineStripArray;
import javax.media.j3d.Material;
import javax.media.j3d.PolygonAttributes;
import javax.media.j3d.RotationInterpolator;
import javax.media.j3d.Shape3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Vector3f;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.GeometryInfo;
import com.sun.j3d.utils.geometry.NormalGenerator;
import com.sun.j3d.utils.geometry.Stripifier;
import com.sun.j3d.utils.geometry.Triangulator;
import com.sun.j3d.utils.universe.SimpleUniverse;
public class GeomInfoApp extends Applet {
float[] createCoordinateData() {
float[] data = new float[69 * 3]; // ******
int i = 0;
data[i++] = -1.3f;
data[i++] = -0.3f;
data[i++] = 0.3f; //0
data[i++] = -0.9f;
data[i++] = -0.3f;
data[i++] = 0.3f; //1
data[i++] = -0.8f;
data[i++] = -0.1f;
data[i++] = 0.3f; //2
data[i++] = -0.6f;
data[i++] = -0.1f;
data[i++] = 0.3f; //3
data[i++] = -0.5f;
data[i++] = -0.3f;
data[i++] = 0.3f; //4
data[i++] = 0.2f;
data[i++] = -0.3f;
data[i++] = 0.3f; //5
data[i++] = 0.3f;
data[i++] = -0.1f;
data[i++] = 0.3f; //6
data[i++] = 0.5f;
data[i++] = -0.1f;
data[i++] = 0.3f; //7
data[i++] = 0.6f;
data[i++] = -0.3f;
data[i++] = 0.3f; //8
data[i++] = 1.3f;
data[i++] = -0.3f;
data[i++] = 0.3f; //9
data[i++] = 1.2f;
data[i++] = -0.1f;
data[i++] = 0.3f; //10
data[i++] = 0.5f;
data[i++] = 0.0f;
data[i++] = 0.3f; //11
data[i++] = 0.1f;
data[i++] = 0.3f;
data[i++] = 0.3f; //12
data[i++] = -0.5f;
data[i++] = 0.3f;
data[i++] = 0.3f; //13
data[i++] = -1.1f;
data[i++] = 0.0f;
data[i++] = 0.3f; //14
data[i++] = -1.3f;
data[i++] = 0.0f;
data[i++] = 0.3f; //15
data[i++] = -1.3f;
data[i++] = -0.3f;
data[i++] = 0.3f; //16
System.out.println("end polygon; total vertex count: " + i / 3);
data[i++] = -1.3f;
data[i++] = -0.3f;
data[i++] = -0.3f; // 0 17
data[i++] = -1.3f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 1 18
data[i++] = -1.1f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 2 19
data[i++] = -0.5f;
data[i++] = 0.3f;
data[i++] = -0.3f; // 3 20
data[i++] = 0.1f;
data[i++] = 0.3f;
data[i++] = -0.3f; // 4 21
data[i++] = 0.5f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 5 22
data[i++] = 1.2f;
data[i++] = -0.1f;
data[i++] = -0.3f; // 6 23
data[i++] = 1.3f;
data[i++] = -0.3f;
data[i++] = -0.3f; // 7 24
data[i++] = 0.6f;
data[i++] = -0.3f;
data[i++] = -0.3f; // 8 25
data[i++] = 0.5f;
data[i++] = -0.1f;
data[i++] = -0.3f; // 9 26
data[i++] = 0.3f;
data[i++] = -0.1f;
data[i++] = -0.3f; //10 27
data[i++] = 0.2f;
data[i++] = -0.3f;
data[i++] = -0.3f; //11 28
data[i++] = -0.5f;
data[i++] = -0.3f;
data[i++] = -0.3f; //12 29
data[i++] = -0.6f;
data[i++] = -0.1f;
data[i++] = -0.3f; //13 30
data[i++] = -0.8f;
data[i++] = -0.1f;
data[i++] = -0.3f; //14 31
data[i++] = -0.9f;
data[i++] = -0.3f;
data[i++] = -0.3f; //15 32
data[i++] = -1.3f;
data[i++] = -0.3f;
data[i++] = -0.3f; //16 33
System.out.println("end polygon; total vertex count: " + i / 3);
data[i++] = 1.3f;
data[i++] = -0.3f;
data[i++] = -0.3f; // 0 34
data[i++] = 1.2f;
data[i++] = -0.1f;
data[i++] = -0.3f; // 1 35
data[i++] = 1.2f;
data[i++] = -0.1f;
data[i++] = 0.3f; // 2 36
data[i++] = 1.3f;
data[i++] = -0.3f;
data[i++] = 0.3f; // 3 37
data[i++] = 1.3f;
data[i++] = -0.3f;
data[i++] = -0.3f; // 4 38
System.out.println("end polygon; total vertex count: " + i / 3);
data[i++] = 1.2f;
data[i++] = -0.1f;
data[i++] = -0.3f; // 0 39
data[i++] = 0.5f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 1 40
data[i++] = 0.5f;
data[i++] = 0.0f;
data[i++] = 0.3f; // 2 41
data[i++] = 1.2f;
data[i++] = -0.1f;
data[i++] = 0.3f; // 3 42
data[i++] = 1.2f;
data[i++] = -0.1f;
data[i++] = -0.3f; // 4 43
System.out.println("end polygon; total vertex count: " + i / 3);
data[i++] = 0.5f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 0 44
data[i++] = 0.1f;
data[i++] = 0.3f;
data[i++] = -0.3f; // 1 45
data[i++] = 0.1f;
data[i++] = 0.3f;
data[i++] = 0.3f; // 2 46
data[i++] = 0.5f;
data[i++] = 0.0f;
data[i++] = 0.3f; // 3 47
data[i++] = 0.5f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 4 48
System.out.println("end polygon; total vertex count: " + i / 3);
data[i++] = 0.1f;
data[i++] = 0.3f;
data[i++] = -0.3f; // 0 49
data[i++] = -0.5f;
data[i++] = 0.3f;
data[i++] = -0.3f; // 1 50
data[i++] = -0.5f;
data[i++] = 0.3f;
data[i++] = 0.3f; // 2 51
data[i++] = 0.1f;
data[i++] = 0.3f;
data[i++] = 0.3f; // 3 52
data[i++] = 0.1f;
data[i++] = 0.3f;
data[i++] = -0.3f; // 4 53
System.out.println("end polygon; total vertex count: " + i / 3);
data[i++] = -0.5f;
data[i++] = 0.3f;
data[i++] = -0.3f; // 0 54
data[i++] = -1.1f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 1 55
data[i++] = -1.1f;
data[i++] = 0.0f;
data[i++] = 0.3f; // 2 56
data[i++] = -0.5f;
data[i++] = 0.3f;
data[i++] = 0.3f; // 3 57
data[i++] = -0.5f;
data[i++] = 0.3f;
data[i++] = -0.3f; // 4 58
System.out.println("end polygon; total vertex count: " + i / 3);
data[i++] = -1.1f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 0 59
data[i++] = -1.3f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 1 60
data[i++] = -1.3f;
data[i++] = 0.0f;
data[i++] = 0.3f; // 2 61
data[i++] = -1.1f;
data[i++] = 0.0f;
data[i++] = 0.3f; // 3 62
data[i++] = -1.1f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 4 63
System.out.println("end polygon; total vertex count: " + i / 3);
data[i++] = -1.3f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 0 64
data[i++] = -1.3f;
data[i++] = -0.3f;
data[i++] = -0.3f; // 1 65
data[i++] = -1.3f;
data[i++] = -0.3f;
data[i++] = 0.3f; // 2 66
data[i++] = -1.3f;
data[i++] = 0.0f;
data[i++] = 0.3f; // 3 67
data[i++] = -1.3f;
data[i++] = 0.0f;
data[i++] = -0.3f; // 4 68
System.out.println("end polygon; total vertex count: " + i / 3);
// ****** This is the data for the hood, roof, trunk, front and rear
// glass
// ****** remove the comments markers below (slash-star) and (star
// slash)
// ****** and add the appropriate comment markers above.
// ****** modification of other lines of code is necessary to use this
// data
// ****** one line above and two lines below
/*
* data[i++]= 1.3f; data[i++]= -0.3f; data[i++]=-0.3f; // 0 35
* data[i++]= 1.2f; data[i++]= -0.1f; data[i++]=-0.3f; // 1 36
* data[i++]= 0.5f; data[i++]= 0.0f; data[i++]=-0.3f; // 2 37 data[i++]=
* 0.1f; data[i++]= 0.3f; data[i++]=-0.3f; // 3 38 data[i++]= -0.5f;
* data[i++]= 0.3f; data[i++]=-0.3f; // 4 39 data[i++]= -1.1f;
* data[i++]= 0.0f; data[i++]=-0.3f; // 5 40 data[i++]= -1.3f;
* data[i++]= 0.0f; data[i++]=-0.3f; // 6 41 data[i++]= -1.3f;
* data[i++]= -0.3f; data[i++]=-0.3f; // 7 42 data[i++]= -1.3f;
* data[i++]= -0.3f; data[i++]= 0.3f; // 8 43 data[i++]= -1.3f;
* data[i++]= 0.0f; data[i++]= 0.3f; // 9 44 data[i++]= -1.1f;
* data[i++]= 0.0f; data[i++]= 0.3f; // 10 45 data[i++]= -0.5f;
* data[i++]= 0.3f; data[i++]= 0.3f; // 11 46 data[i++]= 0.1f;
* data[i++]= 0.3f; data[i++]= 0.3f; // 12 47 data[i++]= 0.5f;
* data[i++]= 0.0f; data[i++]= 0.3f; // 13 48 data[i++]= 1.2f;
* data[i++]= -0.1f; data[i++]= 0.3f; // 14 49 data[i++]= 1.3f;
* data[i++]= -0.3f; data[i++]= 0.3f; // 15 50 data[i++]= 1.3f;
* data[i++]= -0.3f; data[i++]=-0.3f; // 16 51 System.out.println("end
* polygon; total vertex count: "+i/3);
*/
// ****** end of the alternative polygon data
return data;
}
Appearance createMaterialAppearance() {
Appearance materialAppear = new Appearance();
PolygonAttributes polyAttrib = new PolygonAttributes();
polyAttrib.setCullFace(PolygonAttributes.CULL_NONE);
materialAppear.setPolygonAttributes(polyAttrib);
Material material = new Material();
material.setDiffuseColor(new Color3f(1.0f, 0.0f, 0.0f));
materialAppear.setMaterial(material);
return materialAppear;
}
Appearance createWireFrameAppearance() {
Appearance materialAppear = new Appearance();
PolygonAttributes polyAttrib = new PolygonAttributes();
polyAttrib.setPolygonMode(PolygonAttributes.POLYGON_LINE);
materialAppear.setPolygonAttributes(polyAttrib);
ColoringAttributes redColoring = new ColoringAttributes();
redColoring.setColor(1.0f, 0.0f, 0.0f);
materialAppear.setColoringAttributes(redColoring);
return materialAppear;
}
/////////////////////////////////////////////////
//
// create scene graph branch group
//
public BranchGroup createSceneGraph(boolean wireFrame) {
int total = 0;
System.out.println("\n --- geometry debug information --- \n");
float[] coordinateData = null;
coordinateData = createCoordinateData();
int[] stripCount = { 17, 17, 5, 5, 5, 5, 5, 5, 5 }; // ******
// int[] stripCount = {17,17,17}; // ******
for (int i = 0; i < stripCount.length; i++) {
System.out.println("stripCount[" + i + "] = " + stripCount[i]);
total += stripCount[i];
}
if (total != coordinateData.length / 3) {
System.out.println(" coordinateData vertex count: "
+ coordinateData.length / 3);
System.out.println("stripCount total vertex count: " + total);
}
GeometryInfo gi = new GeometryInfo(GeometryInfo.POLYGON_ARRAY);
gi.setCoordinates(coordinateData);
gi.setStripCounts(stripCount);
Triangulator tr = new Triangulator();
// Triangulator tr = new Triangulator(1);
System.out.println("begin triangulation");
tr.triangulate(gi);
System.out.println(" END triangulation");
gi.recomputeIndices();
NormalGenerator ng = new NormalGenerator();
ng.generateNormals(gi);
gi.recomputeIndices();
Stripifier st = new Stripifier();
st.stripify(gi);
gi.recomputeIndices();
Shape3D part = new Shape3D();
if (wireFrame == true)
part.setAppearance(createWireFrameAppearance());
else
part.setAppearance(createMaterialAppearance());
part.setGeometry(gi.getGeometryArray());
/////////////////////////////
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);
objSpin.addChild(part);
////////////////////////
LineStripArray lineArray = new LineStripArray(69,
LineArray.COORDINATES, stripCount); //*****
// LineStripArray lineArray = new LineStripArray(51,
// LineArray.COORDINATES, stripCount); //*****
lineArray.setCoordinates(0, coordinateData);
Appearance blueColorAppearance = new Appearance();
ColoringAttributes blueColoring = new ColoringAttributes();
blueColoring.setColor(0.0f, 0.0f, 1.0f);
blueColorAppearance.setColoringAttributes(blueColoring);
LineAttributes lineAttrib = new LineAttributes();
lineAttrib.setLineWidth(2.0f);
blueColorAppearance.setLineAttributes(lineAttrib);
objSpin.addChild(new Shape3D(lineArray, blueColorAppearance));
Alpha rotationAlpha = new Alpha(-1, 16000);
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
BoundingSphere bounds = new BoundingSphere();
rotator.setSchedulingBounds(bounds);
objSpin.addChild(rotator);
DirectionalLight lightD = new DirectionalLight();
lightD.setDirection(new Vector3f(0.0f, -0.7f, -0.7f));
lightD.setInfluencingBounds(bounds);
contentRoot.addChild(lightD);
AmbientLight lightA = new AmbientLight();
lightA.setInfluencingBounds(bounds);
contentRoot.addChild(lightA);
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 MobiusApp
// Create a simple scene and attach it to the virtual universe
public GeomInfoApp(String[] args) {
setLayout(new BorderLayout());
Canvas3D canvas3D = new Canvas3D(null);
add("Center", canvas3D);
BranchGroup scene = createSceneGraph(args.length > 0);
// 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 GeomInfoApp constructor
// The following allows this to be run as an application
// as well as an applet
public static void main(String[] args) {
System.out.print("GeomInfoApp - Java 3D API demo program\n");
System.out.print("A demonstration of using the GeometryInfo class.\n");
System.out.print("The blue lines show the input geometry - the red ");
System.out
.print("geometry was created by the GeometryInfo and other classes.\n");
System.out
.print("Running the program without any command line arguments will show a solid object\n");
System.out
.print("Supplying any command line argument will show the wireframe.\n");
System.out.print("http://www.sun.com/desktop/java3d\n");
Frame frame = new MainFrame(new GeomInfoApp(args), 256, 256);
} // end of main method of MobiusApp
} // end of class GeomInfoApp
]]>