Applying Textures to an IndexedTriangleStripArray

Question

Hi @ all,
As mentioned in the topic, I want use an IndexedTriangleStripArray for rendering Textures. But I can't programm a prototype with which i would be able to design more complex geometry objects.
I' m not able to assign the right indices to the vertex- and texturecoordinates in the Array.
I've tried to implement it with data BY_REFERENCE like below:
float[] coordinates={
1.0f, 1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f};
float[] texCoord={
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
1.0f, 1.0f};
int[] coordIndex={0, 2,     3, 0, 1, 3};
int[] texCoordIndex={0, 2, 3, 0, 1, 3};
int[] stripIndexCounts={6};
IndexedTriangleStripArray plane = new IndexedTriangleStripArray(4, GeometryArray.COORDINATES | GeometryArray.BY_REFERENCE     |      GeometryArray.TEXTURE_COORDINATE_2, 6,stripIndexCounts);
plane.setCoordRefFloat(coordinates);
plane.setTexCoordRefFloat(0,texCoord);
plane.setCoordinateIndices(0,coordIndex);
plane.setTextureCoordinateIndices(0,0,texCoordIndex);
//Later a texture image is being loaded and the Geometry is embedded in the SimpleUniverse
Unfortunately this sample just displays a white square without the Texture image. Why is the image not been displayed? What did I wrong with the indices numbers?

Answer 1

Hi,
here is the complete source code of the testprogram. It's a modified file of the Java3D Examples1.6
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.image.TextureLoader;
import javax.media.j3d.*;
import javax.vecmath.*;
* SimpleTextureApp creates a single plane with texture mapping.
public class SimpleTextureApp extends Applet
BranchGroup createScene()
BranchGroup objRoot = new BranchGroup();
Transform3D transform = new Transform3D();
               float[] coordinates={
               1.0f, 1.0f, -1.0f,
               1.0f, -1.0f, -1.0f,
               -1.0f, 1.0f, -1.0f,
               -1.0f, -1.0f, -1.0f};
               float[] texCoord={
               0.0f, 0.0f,
               0.0f, 1.0f,
               1.0f, 0.0f,
               1.0f, 1.0f};
               int[] coordIndex={
               0,
               2,
               3,
               0,
               1,
               3};
               int[] texCoordIndex={
               0,
               2,
               3,
               0,
               1,
               3};
               int[] stripIndexCounts={
               6};
               IndexedTriangleStripArray plane = new IndexedTriangleStripArray(4, GeometryArray.COORDINATES | GeometryArray.BY_REFERENCE     |
               GeometryArray.TEXTURE_COORDINATE_2, 6,stripIndexCounts);
               plane.setCoordRefFloat(coordinates);
               plane.setTexCoordRefFloat(0,texCoord);
               plane.setCoordinateIndices(0,coordIndex);
               plane.setTextureCoordinateIndices(0,0,texCoordIndex);
Appearance appear = new Appearance();
String filename = "stripe.gif";
TextureLoader loader = new TextureLoader(filename, null);
ImageComponent2D image = loader.getImage();
if(image == null) {
System.out.println("load failed for texture: "+filename);
// can't use parameterless constuctor
Texture2D texture = new Texture2D(Texture.BASE_LEVEL, Texture.RGBA, image.getWidth(), image.getHeight());
texture.setImage(0, image);
               appear.setTransparencyAttributes(new TransparencyAttributes(TransparencyAttributes.FASTEST, 0.1f));
Shape3D planeObj = new Shape3D(plane, appear);
objRoot.addChild(planeObj);
Background background = new Background();
background.setColor(0.5f, 0.5f, 0.5f);
background.setApplicationBounds(new BoundingSphere());
objRoot.addChild(background);
return objRoot;
public SimpleTextureApp()
setLayout(new BorderLayout());
GraphicsConfiguration config =
SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas3D = new Canvas3D(config);
add("Center", canvas3D);
canvas3D.setStereoEnable(false);
SimpleUniverse u = new SimpleUniverse(canvas3D);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
u.getViewingPlatform().setNominalViewingTransform();
u.addBranchGraph(createScene());
public static void main(String argv[])
System.out.print("SimpleTextureApp.java \n- ");
System.out.println("The simpliest example of using texture mapping.\n");
System.out.println("This is a simple example progam from The Java 3D API Tutorial.");
System.out.println("The Java 3D Tutorial is available on the web at:");
System.out.println("http://java.sun.com/products/java-media/3D/collateral ");
new MainFrame(new SimpleTextureApp(), 256, 256);
I hope this is helpful for you.
Geetings User239