float rotX, rotY;

PVector[][] sphere;
int detail = 50;

void setup() {
  size(600, 600, P3D);
  background(50, 50, 200);
  fill(255, 0, 200);
  stroke(0, 40);
  sphere = new PVector[detail+1][detail+1];
}

void draw() {
  pointLight(255, 255, 255, -width, -height, 2*height);
  translate(width/2, height/2);
  rotateX(rotX);
  rotateY(rotY);
  float r = 200;
  for (int i = 0; i <= detail; i++) {
    float rows = map(i, 0, detail, 0, PI);
    for (int j = 0; j <= detail; j++) {
      float columns = map(j, 0, detail, 0, TWO_PI);
      float x = r * sin(rows) * cos(columns);
      float y = r * sin(rows) * sin(columns);
      float z = r * cos(rows);
      sphere[i][j] = new PVector(x, y, z);
    }
  }
  for (int i = 0; i < detail; i++) {
    beginShape(TRIANGLE_STRIP);
    for (int j = 0; j <= detail; j++) {
      PVector v1 = sphere[i][j];
      vertex(v1.x, v1.y, v1.z);
      PVector v2 = sphere[i+1][j];
      vertex(v2.x, v2.y, v2.z);
    }
    endShape();
  }
}

void mouseDragged() {
  rotY -= (mouseX - pmouseX) * 0.01;
  rotX -= (mouseY - pmouseY) * 0.01;
}