I'm a beginner. I know nothing more than I read in some tutorials. So
pelase be patient and forgiving ;-)

So when I try to construct the scene, the only thing I see is black and
probably empty area :(  My code is similiar to what I've seen in those
tutorials but it simply isn't working, while the examples I tried gave
good results. This is code of my createScene function:
meshX and meshY are constants. int intensity[][] keeps values of y
coordinates. These values can generally be anything between 1 and 255.

public   BranchGroup createScene()
{
  TransformGroup tg = new TransformGroup();
  BranchGroup objRoot = new BranchGroup();
  TriangleArray tri;

  for(i=0;i<meshX-1;i++)
   for(j=0;j<meshY-1;j++)
   {
       tri = new TriangleArray(3, TriangleArray.COORDINATES);
       Shape3D shape = new Shape3D();
       tri.setCoordinate(0, new Point3f(i+1, intensity[i+1][j], j));
       tri.setCoordinate(1, new Point3f(i, intensity[i][j], j));
       tri.setCoordinate(2, new Point3f(i, intensity[i][j+1], j+1));
       shape.setGeometry(tri);
       tg.addChild(shape);
       Shape3D shape2 = new Shape3D();
       tri = new TriangleArray(3, TriangleArray.COORDINATES);
       tri.setCoordinate(0, new Point3f(i+1, intensity[i+1][j+1],
j+1));
       tri.setCoordinate(1, new Point3f(i+1, intensity[i+1][j], j));
       tri.setCoordinate(2, new Point3f(i, intensity[i][j+1], j+1));
       shape2.setGeometry(tri);
       tg.addChild(shape2);

   }

  Transform3D cc3d = new Transform3D();
  cc3d.setTranslation(new Vector3f (0f ,0f ,10f ));
  tg.setTransform(cc3d);
  objRoot.addChild(tg);

  return objRoot;
}

can you help me?

Marcin