How to make a cube face a 3D coordinate (x,y,z) ?

Stephcraft

Hi,

I have a problem with a sketch in witch I need to make some cubes face a certain coordinate in P3D it works for the Z axis just like 2D with atan2() but when it comes to the X and Y axis it doesn't work :/

here is the code I have for now:

---

import peasy.*;

PeasyCam cam;


float x;
float y;
float z;

void setup() {
  size(500,500,P3D);
  cam = new PeasyCam(this, 100);
}

void draw() {
  background(50);

  //the angles
  float angleZ = atan2(-x,y); //-x,y
  float angleX = atan2(0,z);
  float angleY = atan2(-z,x);

  //Cube that need to face the target
  pushMatrix();
  rotateZ(angleZ);
  rotateX(angleX);
  //rotateY(angleY);
  translate(0,0,0);
  box(100);
  line(0,0,0,0,1000,0);
  popMatrix();

  //Cube that need to face the target
  pushMatrix();
  translate(1000,1000,1000);
  rotateZ(atan2(-x+1000,y-1000));
  //rotateX(atan2(y+100,-z-100));
  box(100);
  line(0,0,0,0,1000,0);
  popMatrix();

  //to control the little cube (target)
  if(keyPressed) {
   if(keyCode==UP) {
      y+=4;
    }
    if(keyCode==DOWN) {
      y-=4;
    }
    if(keyCode==LEFT) {
      x+=4;
    }
    if(keyCode==RIGHT) {
      x-=4;
    }
    if(key==' ') {
      z+=4;
    }
    if(keyCode==SHIFT) {
      z-=4;
    }
  }

  //little cube (taget)
  pushMatrix();
  translate(x,y,z);
  box(50);
  popMatrix();
}

---

I used the peasyCam so its easier to see and control

float x,y,z are the targets to face, you can control them with Arrows Space and Shift

thanks !