java - Texture Mapping is reversed! Java3D -

i use eyes me see why texture map reversed on object. prints backwards -- if seeing in mirror. had suspected maybe reversing indices help, changed mapped without reversing reversal.

    public class mobiusbanner extends applet {          public static void main(string[] args) {             new mainframe(new mobiusbanner(), 800, 600);         }          @override         public void init() {             graphicsconfiguration gc = simpleuniverse.getpreferredconfiguration();             canvas3d canvas = new canvas3d(gc);             this.setlayout(new borderlayout());             this.add(canvas, borderlayout.center);             simpleuniverse su = new simpleuniverse(canvas);             su.getviewingplatform().setnominalviewingtransform();             branchgroup bg = createscenegraph();             bg.compile();             su.addbranchgraph(bg);         }          private branchgroup createscenegraph() {             branchgroup root = new branchgroup();             shape3d shape = new shape3d();             shape.setgeometry(mobius().getindexedgeometryarray());              //scaling transform             transform3d tr = new transform3d();             tr.setscale(0.5);              //spin transform group             transformgroup spin = new transformgroup();             spin.setcapability(transformgroup.allow_transform_write);             spin.setcapability(transformgroup.allow_transform_read);             root.addchild(spin);              //set appearance             appearance ap = createtextureappearance();             ap.setpolygonattributes(new polygonattributes(polygonattributes.polygon_fill,             polygonattributes.cull_back, 0));              //set materials             material mat = new material();             mat.setlightingenable(true);             mat.setshininess(30);             ap.setmaterial(mat);              //overarching transform group             transformgroup tg = new transformgroup(tr);             tg.addchild(shape);             spin.addchild(tg);             shape.setappearance(ap);              //set rotation             mouserotate rotator = new mouserotate(spin);             boundingsphere bounds = new boundingsphere();             rotator.setschedulingbounds(bounds);             spin.addchild(rotator);              //set translation             mousetranslate translator = new mousetranslate(spin);             translator.setschedulingbounds(bounds);             spin.addchild(translator);              //set zoom             mousezoom zoom = new mousezoom(spin);             zoom.setschedulingbounds(bounds);             spin.addchild(zoom);               //set background             background background = new background(1.0f, 1.0f, 1.0f);             background.setapplicationbounds(bounds);             root.addchild(background);              f//set lighting             ambientlight light = new ambientlight(true, new color3f(color.black));             light.setinfluencingbounds(bounds);             root.addchild(light);              pointlight ptlight = new pointlight(new color3f(color.white),                     new point3f(0.5f, 0.5f, 1f),                     new point3f(1f, 0.2f, 0f));             ptlight.setinfluencingbounds(bounds);             root.addchild(ptlight);              return root;         }//close branchgroup method          //create mobius shape         private geometryinfo mobius() {             int m = 100; //number of row points             int n = 100; //number of col points             int p = 4 * ((m - 1) * (n - 1)); //faces * points per face              indexedquadarray iqa = new indexedquadarray(m * n,              geometryarray.coordinates | geometryarray.texture_coordinate_2, p);             point3d[] vertices = new point3d[m * n];      int index = 0;              //create vertices             (int = 0; < m; i++) {                 (int j = 0; j < n; j++) {                     double u = * (4 * (math.pi)) / (m - 1);                     double v = -0.3 + (j * (0.6 / (n - 1)));                     double x = (1 + v * math.cos(u / 2)) * math.cos(u);                     double y = (1 + v * math.cos(u / 2)) * math.sin(u);                     double z = v * math.sin(u / 2);                     vertices[index] = new point3d(x, y, z);                     index++;                 }//close nested loop             }//close loop              index = 0;             //set texture coordinates             texcoord2f[] tex = new texcoord2f[m * n];             (int = 0; < m; i++) {                 (int j = 0; j < n; j++) {                     tex[index] = new texcoord2f();                     tex[index] = new texcoord2f(i * 1f / m, j * 1f / n);                     index++;                 }             }              iqa.setcoordinates(0, vertices);             iqa.settexturecoordinates(0, 0, tex);             index = 0;              //set index coordinates             int[] texindices = new int[p];             (int = 0; < m - 1; i++) {                 (int j = 0; j < n - 1; j++) {                     iqa.setcoordinateindex(index, * m + j);                     texindices[index] = * m + j;                     index++;                     iqa.setcoordinateindex(index, * m + j + 1);                     texindices[index] = * m + j + 1;                     index++;                     iqa.setcoordinateindex(index, (i + 1) * m + j + 1);                     texindices[index] = (i + 1) * m + j + 1;                     index++;                     iqa.setcoordinateindex(index, (i + 1) * m + j);                     texindices[index] = (i + 1) * m + j;                     index++;                 }//close nested loop             }//close loop              iqa.settexturecoordinateindices(0, 0, texindices);              //create geometry info , generate normals shape             geometryinfo gi = new geometryinfo(iqa);             normalgenerator ng = new normalgenerator();             ng.generatenormals(gi);             return gi;         }          appearance createtextureappearance() {             appearance ap = new appearance();             bufferedimage bi = new bufferedimage(1024, 128,              bufferedimage.type_int_argb);             graphics2d g2 = (graphics2d) bi.getgraphics();             g2.setcolor(color.white);             g2.fillrect(0, 0, 1024, 128);             g2.setfont(new font("serif", font.bold, 36));             g2.setcolor(new color(200, 0, 0));             g2.drawstring("mobius strip", 0, 100);             imagecomponent2d image = new imagecomponent2d(imagecomponent2d.format_rgba, bi);             texture2d texture = new texture2d(texture.base_level, texture.rgba,                      image.getwidth(), image.getheight());             texture.setimage(0, image);             texture.setmagfilter(texture.base_level_linear);             ap.settexture(texture);              //combine texture , lighting             textureattributes textatt = new textureattributes();             textatt.settexturemode(textureattributes.combine);             ap.settextureattributes(textatt);             ap.setmaterial(new material());             return ap;                  }     } 

you want reverse 1 of texture coordinates, not both. try changing

tex[index] = new texcoord2f(i * 1f / m, j * 1f / n); 

to

tex[index] = new texcoord2f((m-1-i) * 1f / m, j * 1f / n); 

or

tex[index] = new texcoord2f(i * 1f / m, (n-1-j) * 1f / n);