The following code creates rotating boxes with evolving transparency.

When a box is transparent one can see the edges of boxes which are behind however he cannot see those edges of the box itself which are behind.

Is it possible to change that ?

1. /*
2.  ROTATING TRANSLUCENT CUBES 2
3.  EACH CUBE PULSES AT A DIFFERENT RATE
4. */
5. import processing.opengl.*;
6. // VARIABLES
7. int numCubes = 100;
8. int maxDistance = 300;
9. PVector[] places = new PVector[numCubes]; // stores positions of cubes
10. PVector[] angles = new PVector[numCubes]; // stores orientations of cubes
11. float[] pulsFreq = new float[numCubes]; // stores pulsation frequency for alpha
12. int rate = 120; // set frameRate here
13. int transparency = 0; // cube alpha
14. float xRotateFrequency = 0.503 ; //frequency for rotation around x axis
15. float yRotateFrequency = 0.307 ; //frequency for rotation around y axis
16. float zRotateFrequency = 0.409 ; //frequency for rotation around z axis
17. void setup() {
18.   size (500, 500, OPENGL);
19.   frameRate(rate);
20.   //lights();
21.   stroke(255, 255, 255, 128);
22.   strokeWeight(2);
23.   for (int i = 0; i < numCubes; i++) {
24.     places[i] = new PVector (random(0, maxDistance), random(0, maxDistance), random(-100, maxDistance)) ;
25.     angles[i] = new PVector (random(0, TWO_PI), random(0, TWO_PI), random(0, TWO_PI)) ;
26.     pulsFreq[i] = pow(10., random(-0.25, 0.25)) ;
27.   }
28. }
29. void draw() {
30.   background (0, 0, 0, 0);
31.   smooth();
32.   translate(width/2, height/2, 0);
33.   rotateX(xRotateFrequency * float(frameCount) / float(rate));
34.   rotateY(yRotateFrequency * float(frameCount) / float(rate));
35.   rotateZ(zRotateFrequency * float(frameCount) / float(rate));
36.   for (int i = 0; i < numCubes; i++) {
37.     pushMatrix() ;
38.     smooth();
39.     rotateX(angles[i].x);
40.     rotateY(angles[i].y);
41.     rotateZ(angles[i].z);
42.     translate(places[i].x, places[i].y, places[i].z);
43.     transparency = 50 + int(206. * (0.5 + (0.5 * (sin((((pulsFreq[i] * float(frameCount) / float(rate)) * TWO_PI) % TWO_PI))))));
44.     fill(255, 96, 128, transparency) ;
45.     box(30);
46.     popMatrix() ;
47.   }
48. }