How to add and display a triangle with texture

[sergey]

I try create a triangle

public void onSurfaceCreated(GL10 gl, EGLConfig config) {
   TextureManager.getInstance().flush();
   world = new World();
   Resources res = getResources();

   TextureManager tm = TextureManager.getInstance();
   
       Texture grass_f = new Texture(res.openRawResource(R.raw.grass));
   
   font = new Texture(res.openRawResource(R.raw.numbers));
         
   tm.addTexture("grass", grass_f);
   
   s1.set(0.0f, 0.0f, 120.0f);
   s2.set(120.0f, 0.0f, 120.0f);
   s3.set(120.0f, 0.0f, 0.0f);                                    
   //box2 = new Object3d(2);         
box2.addTriangle(s1, 0, 1, s2, 1, 1, s3, 1, 0, tm.getTextureID("grass"));
            
            s2.set(0, 0, 0);
            
            box2.addTriangle(s3, 1, 0, s2, 0, 0, s1, 0, 1, tm.getTextureID("grass"));
            
         box2.setName("box2");
         world.addObject(box2);
         world.buildAllObjects();

         sun = new Light(world);

         Camera cam = world.getCamera();

         cam.moveCamera(Camera.CAMERA_MOVEUP, 20);
         cam.lookAt(box2.getTransformedCenter());

         cam.setFOV(1.5f);
         sun.setIntensity(250, 250, 250);

         SimpleVector sv = new SimpleVector();
         sv.set(box2.getTransformedCenter());
         sv.y -= 300;
         sv.x -= 100;
         sv.z += 200;
         sun.setPosition(sv);
      }

It's not working for me

[EgonOlsen]

Ensure that your triangle is defined counter clockwise or otherwise it will be culled away. Also make sure that your camera is at a position where you can actually see the triangle and not located inside the triangle for example.