gistfile1.txt

// Mouse left to toggle cam change on/off
// Other to toggle transformations

public void setup() {
  size(500, 500, P3D);
  textSize(50);  
}
boolean cam = true;
boolean tran  = true;

public void draw() {
  background(255);
  float x = cos(frameCount/100.0)*20;
  float y = sin(frameCount/100.0)*20;
  textSize(50);
  pushMatrix();
  if (cam) camera(width/2.0, height/2.0, (height/2.0)/tan(PI*30.0/180.0), width/2.0+x, height/2.0+y, 0, 0, 1, 0);
   if (tran) {
     translate(width/2, height/2, -100);
     rotateY(frameCount/50.0);
   }
   fill(64);
   stroke(0);  
   drawAxis();
   box(20);

   noStroke();
   fill(0,0,255);
   text("In scene", mouseX, mouseY);
  popMatrix();
  
  fill(255,0,0);
  text("Out of scene", mouseX, mouseY);
  textSize(20);
  if (cam) {
    text("Cam looking at " + nf(width/2.0+x,3,2) + ":" + nf(height/2.0 + y,3,2),0,30);
  } else {
    text("Cam looking at " + width/2.0 + ":" + height/2.0 ,0,30);
  }
  if (tran) {
    text("Box translated to " + width/2.0 + ":" + height/2.0,0,60);
  } else {
    text("Box translated to 0,0",0,60);
  }
}

public void mouseReleased() {
  println(mouseButton);
  if (mouseButton == LEFT) {
    cam= !cam;
  } else {
    tran = !tran;
  }
}

public void drawAxis() {
  line( -100,    0,    0, 100,   0,   0);
  line(    0, -100,    0,   0, 100,   0);
  line(    0,    0, -100,   0,   0, 100);
}