How to rotate a cube diagonally?

Xand

I am trying to rotate a cube diagonally. I think I need to use pushMatrix / popMatrix, but not sure.

int rotx;
int roty;
int counter;
int dir = 1;


void setup() {
  size(500, 500, P3D);

  noStroke();
}

void draw() {
  background(0);

  pointLight(200, 200, 200, width/2, height/2, 200);

  translate(width/2, height/2, -50);
  rotateX(radians(rotx));
  rotateY(radians(roty));
  scale(100);

  rotx+=dir;
  roty+=dir;

  if (rotx > 360) { 
    dir = -1;
  } else if (rotx < 0) dir = 1;

  if (roty > 360) { 
    dir = -1;
  } else if (roty < 0) dir = 1;

  TexturedCube();
}

void TexturedCube() {

  // +Z "front" face
  beginShape(QUADS);
  vertex(-1, -1, 1, 0, 0);
  vertex( 1, -1, 1, 1, 0);
  vertex( 1, 1, 1, 1, 1);
  vertex(-1, 1, 1, 0, 1);
  endShape();

  // -Z "back" face
  beginShape(QUADS);
  vertex( 1, -1, -1, 0, 0);
  vertex(-1, -1, -1, 1, 0);
  vertex(-1, 1, -1, 1, 1);
  vertex( 1, 1, -1, 0, 1);
  endShape();

  // +Y "bottom" face
  beginShape(QUADS);
  vertex(-1, 1, 1, 0, 0);
  vertex( 1, 1, 1, 1, 0);
  vertex( 1, 1, -1, 1, 1);
  vertex(-1, 1, -1, 0, 1);
  endShape();

  // -Y "top" face
  beginShape(QUADS);
  vertex(-1, -1, -1, 0, 0);
  vertex( 1, -1, -1, 1, 0);
  vertex( 1, -1, 1, 1, 1);
  vertex(-1, -1, 1, 0, 1);
  endShape();

  // +X "right" face
  beginShape(QUADS);
  vertex( 1, -1, 1, 0, 0);
  vertex( 1, -1, -1, 1, 0);
  vertex( 1, 1, -1, 1, 1);
  vertex( 1, 1, 1, 0, 1);
  endShape();

  // -X "left" face
  beginShape(QUADS);
  vertex(-1, -1, -1, 0, 0);
  vertex(-1, -1, 1, 1, 0);
  vertex(-1, 1, 1, 1, 1);
  vertex(-1, 1, -1, 0, 1);
  endShape();
}


void mouseDragged() {
  float rate = 1.01;
  rotx += (pmouseY-mouseY) * rate;
  roty += (mouseX-pmouseX) * rate;
}

Xand

Apparently I should only rotate on one axis, not two. I think this works :)

void setup() {
  size(500, 500, P3D);

  noStroke();
}

float deg = 45.0;
float rad = radians(deg);
float angle = 0.1;
float rad1 = radians(angle);

void draw() {
  background(0);

  camera(mouseX*2, height/2, (height/2) / tan(PI/6), width/2, height/2, 0, 0, 1, 0);
  pointLight(200, 200, 200, width/2, height/2, 200);

  translate(width/2, height/2, -50);

  rotateZ(rad);
  pushMatrix();
  rotateX(rad1);
  pushMatrix();
  rotateZ(-rad);

  scale(100);

  TexturedCube();
  popMatrix();
  popMatrix();
  rad1 = rad1 + 0.01;

}

void TexturedCube() {

  // +Z "front" face
  beginShape(QUADS);
  vertex(-1, -1, 1, 0, 0);
  vertex( 1, -1, 1, 1, 0);
  vertex( 1, 1, 1, 1, 1);
  vertex(-1, 1, 1, 0, 1);
  endShape();

  // -Z "back" face
  beginShape(QUADS);
  vertex( 1, -1, -1, 0, 0);
  vertex(-1, -1, -1, 1, 0);
  vertex(-1, 1, -1, 1, 1);
  vertex( 1, 1, -1, 0, 1);
  endShape();

  // +Y "bottom" face
  beginShape(QUADS);
  vertex(-1, 1, 1, 0, 0);
  vertex( 1, 1, 1, 1, 0);
  vertex( 1, 1, -1, 1, 1);
  vertex(-1, 1, -1, 0, 1);
  endShape();

  // -Y "top" face
  beginShape(QUADS);
  vertex(-1, -1, -1, 0, 0);
  vertex( 1, -1, -1, 1, 0);
  vertex( 1, -1, 1, 1, 1);
  vertex(-1, -1, 1, 0, 1);
  endShape();

  // +X "right" face
  beginShape(QUADS);
  vertex( 1, -1, 1, 0, 0);
  vertex( 1, -1, -1, 1, 0);
  vertex( 1, 1, -1, 1, 1);
  vertex( 1, 1, 1, 0, 1);
  endShape();

  // -X "left" face
  beginShape(QUADS);
  vertex(-1, -1, -1, 0, 0);
  vertex(-1, -1, 1, 1, 0);
  vertex(-1, 1, 1, 1, 1);
  vertex(-1, 1, -1, 0, 1);
  endShape();
}