Incorrect calculations related to FPS

[vrelisean]

I'm trying to make an object rotate constantly, with the speed of 3°/sec (360° in 2 minutes). The code should be pretty simple:

let object;
function setup() {
  ...
  object = new PIXI.Sprite(...);
  app.ticker.add(delta => renderLoop(delta));
}

function renderLoop(delta) {
  object.angle += 3 / 60;  
}

On every render, I increase object's angle by 3 divided by 60 (amount of times the renderLoop function will be called per second). However, when using stopwatch the rotation happens quicker than 3°/sec, and after playing with numbers I concluded that the approximate (if not fully correct) number is 144, and not 60. What can be the cause of this, and is there a better way to get that number instead of hardcoding it?

[ivan.popelyshev]

* Math.PI / 180.0 

[ivan.popelyshev]

Oh wait, angle is already in degrees. The problem is that your monitor has 144Hz , and to take that into account you have to do "3 / 60 * delta"

Edited October 12, 2021 by ivan.popelyshev

[vrelisean]

12 hours ago, ivan.popelyshev said:

Oh wait, angle is already in degrees. The problem is that your monitor has 144Hz , and to take that into account you have to do "3 / 60 * delta"

Works, thank you!