It is not possible, although you change have 3 different radii, one for each axis X,Y,Z

ok my next question:

is it possible to add a childshape to another planet than the first one?

sun = AddEllipsoid (20, 30, "sun.jpg", 90);
  sun.setTexture("sun.jpg", 5, 5);


  // earth
  earth = AddEllipsoid (10, 15, "Earth.jpg", 20);
  earth.moveTo(-300, 0, 0);

  //moon
  moon = AddEllipsoid (10, 15, "Moon.jpg", 8);
  moon.moveTo(-220, 0, 0);
 
  //earth to sun !
  sun.addShape(earth);
  earth.rotateBy(0, radians(90), 0);




but moon to earth is not working :/ the moon appears but only follows the same route as the earth


  earth.addShape(moon);
  moon.rotateBy(radians(90), 0, 0);




the earth orbs around the sun, but the moon does not orb around the earth :(

what to do?


thank you  very much

got it ! i did it without the library, but thank yu!! :)

So you managed without the library.

As I have modified a sketch to demonstrate how to do it with the library, then I will post it here it not for you, then for others who might want to do something similar.

The sketch below has the moon going round the earth and an orbiter going round the moon. To use it load the S3D4P_Earth example delete all the code and paste the code from below in. This will ensure you have the graphics for the earth and moon textures.

1. /**
2.  Earth and Moon
3.  Demonstrating the Shapes3D library.
4.  created by Peter Lager
5.  */
6. import shapes3d.utils.*;
7. import shapes3d.animation.*;
8. import shapes3d.*;
9. 
   
10. Ellipsoid earth, moon, stars;
11. Box orbiter;
12. 
    
13. void setup() {
14.   size(420, 380, OPENGL);   
15.   // Create the earth
16.   earth = new Ellipsoid(this, 20, 30);
17.   earth.setTexture("earth.jpg");
18.   earth.setRadius(90);
19.   earth.moveTo(new PVector(0, 0, 0));
20.   earth.drawMode(Shape3D.TEXTURE);
21.   // Create the moon
22.   moon = new Ellipsoid(this, 10, 15);
23.   moon.setTexture("moon.jpg");
24.   moon.setRadius(20);
25.   moon.moveTo(0, 0, 220);
26.   moon.drawMode(Shape3D.TEXTURE);
27.   // Create the moon orbiter
28.   orbiter = new Box(this, 6, 10, 6);
29.   orbiter.fill(color(128));
30.   orbiter.stroke(color(200));
31.   orbiter.strokeWeight(1.0f);
32.   orbiter.moveTo(0, 0, -30);
33.   orbiter.drawMode(Shape3D.SOLID | Shape3D.WIRE);
34.   orbiter.tag = "orbiter";
35.   // Create the star background
36.   stars = new Ellipsoid(this, 10, 10);
37.   stars.setTexture("stars01.jpg", 5, 5);
38.   stars.setRadius(400);
39.   stars.drawMode(Shape3D.TEXTURE);
40.   // Add the moon to the earth this makes
41.   // its position relative to the earth's
42.   earth.addShape(moon);
43.   moon.addShape(orbiter);
44. }
45. 
    
46. void draw() {
47.   // Change the rotations before drawing
48.   earth.rotateBy(0, radians(0.4), 0);
49.   moon.rotateBy(0, radians(1.2), 0);
50.   orbiter.rotateBy(0, 0, radians(4.0f));
51.   stars.rotateBy(0, 0, radians(0.025));
52.   // Start rendering
53.   background(40);
54.   pushMatrix();
55.   camera(0, -190, 350, 0, 0, 0, 0, 1, 0);
56.   ambientLight(120, 120, 120);
57.   directionalLight(180, 180, 180, -12, 12, -10);
58.   // Draw the earth (will cause all added shapes
59.   // to be drawn i.e. the moon)
60.   earth.draw();
61.   // Reset the lights before drawing stars
62.   noLights();
63.   stars.draw();
64.   popMatrix();
65. }

great ! thank you very much any way!!! :)))