Using Texture3D!?

Question

Hi all,
I've been trying without success to get a simple Texture3D working and for the life of me cannot figure why it's showing up white. I get no errors, but no texture either.
I've found very little good documentation about how this texture works; however I think I understand the basic idea (except that it will simply NOT work). The following sample code DOES work, even when I modify it to read a small image file and assign its values across its depth or R-dimension. However when I apply it to my larger application I get nothing but white.
http://java3d.j3d.org/faq/examples/Texture3DTest.java
So... I know the image is loading and filling the ImageComponent3D object correctly. The problem must be with the assignment of texture coordinates. I've tried two options:
1.) assigning texture coordinates directly to my 4-node planar polygon coordinates with values of (0,1,0.5), (0,0,0.5), (1,0,0.5), (1,1,0.5). I have code to generate Texture2D on this same polygon with the same coordinates, lacking the R=0.5 coordinate, which works fine. So I cannot understand why these texture 3D coordinates do not work. The code is here:
//set coordinates
Point3f[] polyArray = new Point3f[n];
getPolygon().getNodes().toArray(polyArray);
//create geometry
GeometryInfo gi = new GeometryInfo(GeometryInfo.POLYGON_ARRAY);
gi.setCoordinates(polyArray);
//set texture coordinates          
gi.setTextureCoordinateParams(1, 3);
//function getTexCoords3d() returns the coordinates
//(0,1,0.5), (0,0,0.5), (1,0,0.5), (1,1,0.5)
gi.setTextureCoordinates(0, texture.getTexCoords3d());
//stripify
gi.setStripCounts(new int[]{getPolygon().n});
gi.setContourCounts(new int[]{1});
Stripifier st = new Stripifier();
st.stripify(gi);
//generate normals
NormalGenerator ng = new NormalGenerator();
ng.generateNormals(gi);
//create node
Shape3D thisShapeNode = new Shape3D(gi.getGeometryArray());
Appearance thisAppNode = new Appearance();
PolygonAttributes pAtt = new PolygonAttributes();
pAtt.setCullFace(PolygonAttributes.CULL_NONE);
thisAppNode.setPolygonAttributes(pAtt);
Material m = new Material();
m.setLightingEnable(false);
thisAppNode.setMaterial(m);
//returns a valid Texture3D object
thisAppNode.setTexture(texture.texture3D);
//thisAppNode.setTexCoordGeneration(texture.getTexGen3D(this));
thisShapeNode.setAppearance(thisAppNode);2.) assigning a TexCoordGeneration with the following code (is commented out in the above code):
public TexCoordGeneration getTexGen3D(Shape3DInt s){
     TexCoordGeneration gen = new TexCoordGeneration(TexCoordGeneration.OBJECT_LINEAR, TexCoordGeneration.TEXTURE_COORDINATE_3);
     Sphere3D sphere = s.getBoundSphere();
     float scale = 0.5f / sphere.radius;
     ArrayList<Point3f> nodes = s.thisShape.getNodes();
     Vector4f sPlane = new Vector4f(scale, 0, 0, -nodes.get(1).x);
     Vector4f tPlane = new Vector4f(0, scale, 0, -nodes.get(1).y);
     Vector4f rPlane = new Vector4f(0, 0, scale, -nodes.get(1).z);
     gen.setPlaneS(sPlane);
     gen.setPlaneT(tPlane);
     gen.setPlaneR(rPlane);
     return gen;
     }Where scale represents the object's size and nodes.get(1) is its bottom left coordinate.
This also gives me a white polygon. Sorry for the long-winded email, but I am running out of options with this code =(
Any help is appreciated, cheers!
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Answer 1

Well the whole application's huge, but I'll post the two classes that matter:
This is the class that loads and sets up the texture (I've included the texture2D functions, which work fine)
package ar.Interface.Shapes.Util;
//imports here
public class TestTexture {
     public Texture3D texture3D = new Texture3D();
        public Texture2D texture2D = new Texture2D();
     public TexCoordGeneration texgen3D = new TexCoordGeneration(TexCoordGeneration.OBJECT_LINEAR, TexCoordGeneration.TEXTURE_COORDINATE_3);
        //constructor opens a preset file and passes it to LoadTexture3D
     public TestTexture(){
          File file = new File("C:\\Documents and Settings\\atreid\\My Documents\\My Pictures\\java3d.jpg");
          try{
                        LoadTexture2D(file.toURI().toURL());
               LoadTexture3D(file.toURI().toURL());
          catch(MalformedURLException e){
               e.printStackTrace();
        //loads an image from a url into a Texture2D object
        //must have power-of-two dimensions
        public void LoadTexture2D(URL url){
          try{
               BufferedImage bi = ImageIO.read(url);
               ImageComponent2D image = new ImageComponent2D(ImageComponent2D.FORMAT_RGB, bi);
               texture2D = new Texture2D(Texture2D.BASE_LEVEL,
                                               Texture2D.RGB,
                                               powerOfTwo(image.getWidth()),
                                               powerOfTwo(image.getHeight()));
               texture2D.setImage(0, image);
          catch (IOException e){
               e.printStackTrace();
               return;
     //loads an image from a url into a Texture3D object
        //must have power-of-two dimensions
     public void LoadTexture3D(URL url){
          try{
                        //get buffered image from url
               BufferedImage urlImage = ImageIO.read(url);
                        //set dimensions
               int width = urlImage.getWidth();
               int height = urlImage.getHeight();
               int depth = 16;
               byte[] origData = ((DataBufferByte)urlImage.getData().getDataBuffer()).getData();
               ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);
               int[] nBits = {8, 8, 8};
               ComponentColorModel colorModel = new ComponentColorModel(cs, nBits, false, false, Transparency.OPAQUE, 0);
               WritableRaster raster = colorModel.createCompatibleWritableRaster(width, height);
               BufferedImage bImage = new BufferedImage(colorModel, raster, false, null);
               byte[] byteData = ((DataBufferByte)raster.getDataBuffer()).getData();
               ImageComponent3D pArray = new ImageComponent3D(ImageComponent.FORMAT_RGB, width, height, depth);
               // copy urlImage to bImage
               for (int j = 0;j < height;j++)
                    for (int i = 0;i < width;i++){
                        int index = ((j * width) + i) * 3;
                        byteData[index] = origData[index];
                        byteData[index + 1] = origData[index + 1];
                        byteData[index + 2] = origData[index + 2];
               // copy multiples of bImage into pArray
               for (int k = 0; k < depth; k++)
                    pArray.set(k, bImage);
                        //set texture3D from pArray
               texture3D = new Texture3D(Texture.BASE_LEVEL,
                                Texture.RGB,
                                width,
                                height,
                                depth);
               texture3D.setImage(0, pArray);
               texture3D.setEnable(true);
               texture3D.setMinFilter(Texture.BASE_LEVEL_LINEAR);
               texture3D.setMagFilter(Texture.BASE_LEVEL_LINEAR);
               texture3D.setBoundaryModeS(Texture.CLAMP);
               texture3D.setBoundaryModeT(Texture.CLAMP);
               texture3D.setBoundaryModeR(Texture.CLAMP);
          catch (IOException e){
               e.printStackTrace();
               return;
     //return a TexCoordGeneration object for a polygon with lower left corner at
     //nodes(1)
     public TexCoordGeneration getTexGen3D(Shape3DInt s){
          TexCoordGeneration gen = new TexCoordGeneration(TexCoordGeneration.OBJECT_LINEAR, TexCoordGeneration.TEXTURE_COORDINATE_3);
          Sphere3D sphere = s.getBoundSphere();
          float scale = 0.5f / sphere.radius;
          ArrayList<Point3f> nodes = s.thisShape.getNodes();
          Vector4f sPlane = new Vector4f(scale, 0, 0, -nodes.get(1).x);
          Vector4f tPlane = new Vector4f(0, scale, 0, -nodes.get(1).y);
          Vector4f rPlane = new Vector4f(0, 0, scale, -nodes.get(1).z);
          gen.setPlaneS(sPlane);
          gen.setPlaneT(tPlane);
          gen.setPlaneR(rPlane);
          return gen;
        //return 2D texture coordinates for a 4-node planar polygon
        public TexCoord2f[] getTexCoords(){
          TexCoord2f[] texPts = new TexCoord2f[4];
          for (int i = 0; i < 4; i++)
               texPts[i] = new TexCoord2f(getTexPt(i));
          return texPts;
     //return 3D texture coordinates for a 4-node planar polygon
     public TexCoord3f[] getTexCoords3d(){
          TexCoord3f[] texPts = new TexCoord3f[4];
          for (int i = 0; i < 4; i++)
               texPts[i] = new TexCoord3f(getTexPt3d(i, 0.5f));
          return texPts;
     //set texture3D coordinates by adding a z coordinate to 2D ones
     private Point3f getTexPt3d(int i, float z){
          Point2f pt2 = getTexPt(i);
          Point3f pt3 = new Point3f();
          pt3.x = pt2.x;
          pt3.y = pt2.y;
          pt3.z = z;
          return pt3;
     //set 2D texture coordinate i for a CCW 4-node planar polygon
     private Point2f getTexPt(int i){
          Point2f retPt = new Point2f();
          switch (i){
          case 0:
               retPt.x = 0;
               retPt.y = 1;
               break;
          case 1:
               retPt.x = 0;
               retPt.y = 0;
               break;
          case 2:
               retPt.x = 1;
               retPt.y = 0;
               break;
          case 3:
               retPt.x = 1;
               retPt.y = 1;
               break;
          return retPt;
}This is the "Shape3DInt" class which extends a polygon shape to add texture to it. The "setScene3DObject()" method is an overridden method which sets a BranchGraph (scene3DObject) that is inserted into the scene graph elsewhere.
package ar.Interface.Shapes;
//imports here
public class TestTextureInt extends Polygon3DInt {
     TestTexture texture = new TestTexture();
     public TestTextureInt(){
          super();
     public TestTextureInt(Polygon3D p){
          super(p);
     //sets a BranchGroup to be inserted into a Java3D scene graph
     public void setScene3DObject(){
          scene3DObject = new BranchGroup();
          if (!isVisible()) return;
          getPolygon().finalize();
          int n = getPolygon().n;
          if (n < 3) return;
          Point3f[] polyArray = new Point3f[n];
          getPolygon().getNodes().toArray(polyArray);
          //create geometry
          GeometryInfo gi = new GeometryInfo(GeometryInfo.POLYGON_ARRAY);
          gi.setCoordinates(polyArray);
          //set texture coordinates
                //comment out if using TexCoordGeneration
          gi.setTextureCoordinateParams(1, 3);
          gi.setTextureCoordinates(0, texture.getTexCoords3d());
                //stripify polygon
          gi.setStripCounts(new int[]{getPolygon().n});
          gi.setContourCounts(new int[]{1});
          Stripifier st = new Stripifier();
                st.stripify(gi);
                //generate normals
                NormalGenerator ng = new NormalGenerator();
                ng.generateNormals(gi);
          Shape3D thisShapeNode = new Shape3D(gi.getGeometryArray());
          Appearance thisAppNode = new Appearance();
          PolygonAttributes pAtt = new PolygonAttributes();
          pAtt.setCullFace(PolygonAttributes.CULL_NONE);
          thisAppNode.setPolygonAttributes(pAtt);
          Material m = new Material();
          m.setLightingEnable(false);
          thisAppNode.setMaterial(m);
          thisAppNode.setTexture(texture.texture3D);
          //uncomment to set texture coordinates using TexCoordGeneration
          //thisAppNode.setTexCoordGeneration(texture.getTexGen3D(this));
          thisShapeNode.setAppearance(thisAppNode);
          scene3DObject.removeAllChildren();
          scene3DObject.addChild(thisShapeNode);
}Again, this works fine for Texture2D, but for Texture3D I get a completely white polygon. Thanks again...
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