// Why do I get a negative radius when I enquire about the bounds of the shape3D
object in this
// simple test program? Thanks for all the help. Geometry consists of triangular
facets of a cube.
// Ram P Kochhar
//
> import java.applet.Applet;
> import java.awt.BorderLayout;
> import java.awt.Frame;
> import java.awt.event.*;
> import com.sun.j3d.utils.applet.MainFrame;
> import com.sun.j3d.utils.universe.*;
> import com.sun.j3d.utils.geometry.GeometryInfo;
> import com.sun.j3d.utils.geometry.Triangulator;
> import javax.media.j3d.*;
> import javax.vecmath.*;
> import java.awt.BorderLayout;
>
> public class test4 extends Applet{
> Geometry voGeometry;
>
> public test4() {
> setLayout(new BorderLayout());
> Canvas3D canv3D = new Canvas3D(null);
> add("Center", canv3D);
>
> voGeometry = createGeometry();
> BranchGroup scene = CreateSceneGraph(voGeometry);
>
> scene.compile();
>
> SimpleUniverse simpU=new SimpleUniverse(canv3D);
>
> simpU.getViewingPlatform().setNominalViewingTransform();
>
> simpU.addBranchGraph(scene);
> }
>
> public BranchGroup CreateSceneGraph(Geometry geom) {
> BranchGroup objRoot = new BranchGroup();
>
>
> Shape3D shape = new Shape3D();
> shape.setCapability(shape.ALLOW_BOUNDS_READ);
> shape.setGeometry(geom);
>
//********************************************************************************************
> BoundingSphere sceneBounds = (BoundingSphere) shape.getBounds();
>
> System.out.println(" " + sceneBounds);
> Point3d center = new Point3d();
> sceneBounds.getCenter(center);
> double radius = sceneBounds.getRadius();
> Vector3d temp = new Vector3d(center);
//*****************************************************************************************
> //To draw polygon outline
>
>
> Appearance appearance = new Appearance();
>
> PolygonAttributes polyAttrib = new PolygonAttributes();
> polyAttrib.setPolygonMode(PolygonAttributes.POLYGON_LINE);
> polyAttrib.setCullFace(PolygonAttributes.CULL_NONE);
> appearance.setPolygonAttributes(polyAttrib);
>
> shape.setAppearance(appearance);
>
> Transform3D rotate = new Transform3D();
> Transform3D tempRotate = new Transform3D();
>
> rotate.rotX(Math.PI/4.0d);
> tempRotate.rotY(Math.PI/5.0d);
>
> rotate.mul(tempRotate);
> rotate.setScale(0.4);
>
> TransformGroup objRotate = new TransformGroup(rotate);
>
> objRoot.addChild(objRotate);
>
> objRotate.addChild(shape);
>
>
> return(objRoot);
> }
>
> public Geometry createGeometry() {
>
> Point3f[] coord = new Point3f[10];
> int[] stripCount ={3,3,4};
>
> coord[0] = new Point3f(0.0f,0.0f,0.0f);
> coord[1] = new Point3f(1.0f,0.0f,0.0f);
> coord[2] = new Point3f(1.0f,1.0f,0.0f);
>
> coord[3] = new Point3f(0.0f,0.0f,0.0f);
> coord[4] = new Point3f(1.0f,1.0f,0.0f);
> coord[5] = new Point3f(0.0f,0.0f,1.0f);
>
> coord[6] = new Point3f(0.0f,0.0f,0.0f);
> coord[7] = new Point3f(0.0f,0.0f,1.0f);
> coord[8] = new Point3f(1.0f,0.0f,1.0f);
> coord[9] = new Point3f(1.0f,0.0f,0.0f);
>
>
> TriangleFanArray tfa = new TriangleFanArray(10,
> TriangleFanArray.COORDINATES,stripCount);
> tfa.setCoordinates(0,coord);
> return(tfa);
> }
>
> public static void main(String[] args) {
> Frame frame = new MainFrame(new test4(),500,500);
> }
> }
>
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