I used this project as a test bed to try different ideas and see the visual effects.

 

-When the mouse is pressed, the orbits of the Moon and the fictitious asteroid change, even if there is nothing in the function called by mouse pressed. Why?

 

- I could only manage to draw a few mountains by inscribing boxes inside of it and making the corners visible. How can I make other drawings in the surface of the sphere (Earth)?  Like text for example?

 

- How can I make the axis round instead of a very long and thin box? Any ideas??

 

In the video, the mouse pressed function was not present and the magnetic field is always visible.

 

http://www.youtube.com/watch?v=CJGxYJBbwl4

 

int W=1350;  //Earth-Moon System by Adrian Fernandez 04-09-2013
int H=700;
float i=0;   //Angular variable
float OrbitWidth=700;
float OrbitHoizInclination=7; 
float Speed=0.007;
float r=0;

void setup()
{
size(W,H,P3D);
}
void draw()
{ 
  background(5);
  camera(mouseX, mouseY, 220.0, width/2,height/2,-OrbitWidth/2, 0.1,1, 0.1); //Move the camera with the mouse.
  directionalLight(255, 255, 255, -1, 0,-0.25);
  translate(width/2,height/2,-OrbitWidth/2);    //Positions Earth at center.     
  rotate(0.1);
  rotateY(frameCount/200.0); //To rotate the Earth 
  fill(0,200,255);
  noStroke();
  sphereDetail(30);     //Sets more detail for the Earth Sphere a it is bigger. 
  sphere(121);          //Draws Earth Sphere
  fill(255);
  rotate(0.15);
  box(142);
  rotate(0.20);
  box(142);
  rotate(-0.20);
  rotate(0.15);
  box(142);
  fill(255);
  box(5,600,5);
  if(mousePressed)//Click to see mag field.
   {
    rotate(-0.15);    //Makes the magnetig field appear off center
    ShowMagneticField();
   } 
  rotateY(-frameCount/200.0);  //Stops rotation before the next spheres are drawn.
  i=(i+Speed)%TWO_PI;   //Sets angle between 0 and 2*PI.
  fill(250);  
  translate(3*OrbitWidth/2*cos(i),OrbitWidth/OrbitHoizInclination*cos(i),-3*OrbitWidth/2-2*OrbitWidth*sin(i)); //Moon coordinates 
  noStroke();
  sphereDetail(20);     //Sets less detail for the Moon.
  sphere(45);           //Draws Moon Sphere.
  translate(OrbitWidth*cos(1.19*i)+(W/1.5),1.1*OrbitWidth/OrbitHoizInclination*cos(i/5),OrbitWidth/2-OrbitWidth*sin(i)+270); //Asteroid coordinates
  rotate(2);
  fill(220);
  sphereDetail(6);     //Sets less detail for the Asteroid to make it look rocky.
  sphere(20);           //Draws Asteroid Sphere. 
}
void ShowMagneticField()
{
  noFill(); 
  strokeWeight(0.5);
  for(int k=10;k<360;k=k+10)
  {
  rotateY(k);
  stroke(255,k,0);
  ellipse(100,0,250,380);
  stroke(0,k,255);
  ellipse(-100,0,250,380);
  }
  rotateY(-350); 
}