I am trying to get my head around rotating points in a 3D space and I am not having much luck. I have this code...

Code:

float a = 0;
  float x=0;
 float y= 0; 
 float z = -100;

void setup() {
  size(640, 360, P3D);

  stroke(255);
  fill(255, 255);
}

void draw() {
   background(0);
  
 translate(width/2, height/2);

  rotateY(radians(a));
  point (x, y, z);

a=a+1;
if (a>360) {a=0;}
}
 

Which, as far as I can work out should put a point at 0, 0, -100 or 100 points away from the camera. I presumed that rotating the Z axis would make the point spin around the cameras location but it seems Y is the closest to do this.

But, when it rotates, instead of doing what I expected it to do, i.e. to rotate around the cameras position (going behind the camera and then re-appearing on the opposite side) it seems to rotate around a point off in the distance, almost as if the camera has been moved backwards by some distance from thr 0, 0, 0 position.

I am sure I am just doing something wrong but can someone help please.

Thanks, that fixed it :-

Code:

float a = 0;
float x=0;
float y= 0; 
float z = -100;

void setup() {
  size(640, 360, P3D);

  stroke(255);
  fill(255, 255);
  camera(0, 0, 0, 0, 0, -100, 0, 1, 0);
 
}

void draw() {
  background(0);
  
  translate(width/2, height/2);
  
  rotateY(radians(a));
  point (x, y, z);
 
  a=a+1;
  if (a>360) {a=0;}
}