hi people,
I have a problem with rotations of ellipses around a sphere. I place my dots and ellipse in 3D like this:

1. import processing.opengl.*;
2. int canvasX = 250;    
3. int canvasY = canvasX;    
4. int canvasZ = canvasX; 
5. int dots = 500;
6. int radius = 150;
7. float[] posX = new float[dots];
8. float[] posY = new float[dots];
9. float[] posZ = new float[dots];
10. void setup() {
11.   size(500,500, OPENGL);
12.   frameRate(30);
13.   background(0);
14.   smooth();
15. }
16. void draw() {
17.   noFill();
18.   stroke(255);
19.   translate(canvasX/2, canvasY/2);
20.   for (int i = 0; i < dots; i++) {
21.     float phi = posX[i]*TWO_PI;
22.     float theta = PI - posY[i]*PI;
23.     posX[i] = radius*sin(theta)*cos(phi)+canvasX/2;
24.     posY[i] = radius*sin(theta)*sin(phi)+canvasY/2;
25.     posZ[i] = radius*cos(theta)+canvasZ/2;
26.     point(posX[i], posY[i],posZ[i]);
27.     pushMatrix();
28.     translate(posX[i], posY[i],posZ[i]);
29.     //rotateX(???);
30.     //rotateY(???);
    
31.     ellipse(0,0,10,10);
32.     popMatrix();
33.   }
34. }

but I can find the way to rotate my ellipses to orient them in front of the center of the created sphere...like a "lookAt the center" property...or maybe a tangent stuff?
anyone got an idea ?
thx