3dbox

PGraphics cube;
float theta;
int frames = 300;

void setup() {
  size(500, 500, P3D);
  cube = createGraphics(100, 100, P3D);
}

void draw() {
  background(0);
  drawCube();
  for (int x=0; x<width; x+=cube.width) {
    for (int y=0; y<height; y+=cube.height) {
      image(cube, x, y);
    }
  }
  if (frameCount<=frames) saveFrame("image-###.gif");
}

void drawCube() {
  cube.beginDraw();
  cube.lights();
  cube.background(0);
  cube.noStroke();
  cube.pushMatrix();
  cube.translate(cube.width/2, cube.height/2);
  //cube.rotateX(frameCount/100.0);
  //cube.rotateY(frameCount/200.0);
  cube.rotateX(theta*2);
  cube.rotateY(theta*1);
  cube.box(cube.width/2);
  cube.popMatrix();
  cube.endDraw();
  theta += TWO_PI/frames;
}