ticker first deltaTime is larger

[liajoy]

app.ticker.add(function(delta) {
  console.log(delta);
  // first log will be 5 or 6
  // then 1.xxxx
})

Hello!

How to prevent this? is this a bug or a feature?

[ivan.popelyshev]

There's no "previous" time for first tick, this is undefined behaviour for pixi. If you want to change it, please make a Pull Request or at least an Issue, its such a small thing that I dont even want to do it myself.

Here's file in v5 branch (dev): https://github.com/pixijs/pixi.js/blob/dev/packages/ticker/src/Ticker.js 

[ivan.popelyshev]

https://github.com/pixijs/pixi.js/blob/dev/packages/ticker/src/Ticker.js#L395

"this.lastTime" is "-1" for first tick. 

Considering that most people use some asynchronous loader before game actually starts, first tick is not important.

[Exca]

You could also ignore the few first ticks to let the ticker settle down (gpu uploads etc. might be happening at that point which takes some time).

[ivan.popelyshev]

Yeah, related thread: 

  this thing also affects ticker, and that's not first tick, that's on game start.