Hey anndorian
I'm doing quite the same as you for an university project at the
moment and was doing it like Peter explained!
Furthermore you don't even have to calculate the rotation by yourself,
you can just use rotationY.
this is how I'm doing that:
//Create the sun
sun = new Sphere( { radius:10 } );
//Create the earth
earth = new Sphere( { radius:5 } );
//Create container for earth (needed for circular rotation)
earthContainer = new ObjectContainer3D();
//Add earth to its container and offset from container position
earthContainer.addChild(earth);
earth.z = -100;
//Same for the moon
moon = new Sphere( { radius:2 } );
//Set the moon Container to the earth coordinates
moonContainer = new ObjectContainer3D( { x:earth.x, y:earth.y,
z:earth.z } );
moonContainer.addChild(moon);
moon.z = -20;
earthContainer.addChild(moonContainer);
view.scene.addChild(sun);
view.scene.addChild(earthContainer);
//Rotates the earth around its own axis
earth.rotationY += 2;
//Rotates the earth around the sun
earthContainer.rotationY += 1;
//Rotates the moon around the earth
moonContainer.rotationY +=4;
Of course the scene is not physically correct, but that should be the
basic functionality!
Hope this helps and let me know if it works for you!
cheers
Lami
On 17 Apr., 02:15, anndorian <[email protected]> wrote:
> Ok, I have a star and a planet orbiting around it using :
>
> // posX - distance between star and planet
> theta=Math.PI;
>
> theta -= (speed * 0.1) / 180 * Math.PI;
>
> body.x = Math.cos(theta) * posX;
> body.z = Math.sin(theta) * posX;
>
> The problem is I don't know how to put a satellite orbiting that
> planet ( which orbits the star ). Can anyone help me ?
>
> Thanks.
