Update OrbitControls.js

[mtsee]

Add a seek event, in the execution of drag, zoom, trigger this seek method, eg: do react performance optimization, animating do update() is very bad.
use: this.orbitControls.on('seek', () => { do somthing });

[gkjohnson]

What's your goal with "seek"? Does the "change" event let you achieve what you're looking for?

controls.addEventListener('change', () => {
  // controls have been moved
});

[mtsee]

When used in react or vue, I want update render() when zooming or dragging, but currently only render when animate does, which can be very expensive.

render() {
    return <div>zooming or dragging will do render()</div>
}

[gkjohnson]

If I'm understanding correctly and you only want to rerender the scene or your application when the controls are dragged or zoomed then you can achieve that with the change event I listed above:

controls.addEventListener('change', () => {
  // rerender scene or application component
});

You shouldn't need any changes to OrbitControls.

[mtsee]

thanks! just this change