I am trying to get the following code to make the shapes rotate around the center using the camera() function.  All it does is begin at the starting point, then move to a second point exactly half-way between the x and y axis.  You can try the code for yourself to see what it does.

 

int domeRadius = 100;
int cwidth = 25;
int cheight = 100;
int csides = 50;
int sectorRadius = 75;
int R = 93;
int G = 93;
int BDome = 139;
int ADome = 128;
int A = 255;
int B = 255;
float cangle = 0;
float initialRotationx = 0;
float initialRotationy = width/2;
float rotationx = initialRotationx;
float rotationy = initialRotationy;

void setup() {
  size(400, 400, P3D);
  background(0);
  smooth();
  noStroke();
  rotateCamera();
  celestialDome(width/2, height/2, 0);
  sectorFive();
  tunnels(cwidth, cheight, csides);
}

void draw() {
  background(0);
  rotateCamera();
  celestialDome(width/2, height/2, 0);
  sectorFive();
  tunnels(cwidth, cheight, csides);
}

void celestialDome(int translationx, int translationy, int translationz) {
  translate(width / 2, height / 2, 0);
  fill(R, G, BDome, ADome);
  sphere(domeRadius);
}

void sectorFive() {
  fill(R, G, B, A);
  sphere(sectorRadius);
}

void tunnels(int cWidth, int cHeight, int cSides) {
  fill(93, 93, 125);
  rotateZ(-PI - HALF_PI);
  translate(0, 125, 0);
  cylinder(cWidth, cHeight, cSides);
 
  rotateZ(PI);
  translate(0, 250, 0);
  cylinder(cWidth, cHeight, cSides);
 
  rotateZ(HALF_PI);
  translate(-125, 125, 0);
  cylinder(cWidth, cHeight, cSides);
 
  rotateZ(PI);
  translate(0, 250, 0);
  cylinder(cWidth, cHeight, cSides);
 
  println("Tunnels Created");
}

void cylinder(float w, float h, int sides)
{
  float angle;
  float[] x = new float[sides+1];
  float[] z = new float[sides+1];
 
  //get the x and z position on a circle for all the sides
  for(int i=0; i < x.length; i++){
    angle = TWO_PI / (sides) * i;
    x[i] = sin(angle) * w;
    z[i] = cos(angle) * w;
  }
 
  //draw the top of the cylinder
  beginShape(TRIANGLE_FAN);
  vertex(0,   -h/2,    0);
 
  for(int i=0; i < x.length; i++){
    vertex(x[i], -h/2, z[i]);
  }
  endShape();
 
  //draw the center of the cylinder
  beginShape(QUAD_STRIP);
  for(int i=0; i < x.length; i++){
    vertex(x[i], -h/2, z[i]);
    vertex(x[i], h/2, z[i]);
  }
  endShape();
 
  //draw the bottom of the cylinder
  beginShape(TRIANGLE_FAN);
  vertex(0,   h/2,    0);
  for(int i=0; i < x.length; i++){
    vertex(x[i], h/2, z[i]);
  }
  endShape();
}

void rotateCamera(){
  rotationx = initialRotationx - (initialRotationx * sin(radians(cangle)));
  rotationy = initialRotationy - (initialRotationy * cos(radians(cangle)));
  camera(rotationx, rotationy, 0,
         width/2, height/2, 0,
         0, 0, -1.0);
  cangle++;
  println("Angle Incremented");
  println("Angle = " + cangle);
  if(rotationx <= -width/2) {
    rotationx = initialRotationx;
    cangle = 0;
    println("Rotationx reset");
  }
 
  if(rotationy <= 0) {
    rotationy = initialRotationy;
    cangle = 0;
    println("Rotationy reset");
  }
  println("Rotating Camera");
}