FirstPersonControls: Update interaction model.

[mrdoob]

Description

Changed the interaction model to require dragging to control the camera orientation, using pointer capture and movement deltas instead of tracking the absolute cursor position. This makes the controls feel more intentional and consistent with other drag-based controls. As a result, activeLook and handleResize() are no longer needed — the former has been removed and the latter replaced with a deprecated stub.

http://raw.githack.com/mrdoob/three.js/controls/examples/webaudio_sandbox.html
http://raw.githack.com/mrdoob/three.js/controls/examples/webgl_geometry_minecraft.html
http://raw.githack.com/mrdoob/three.js/controls/examples/webgl_geometry_terrain.html
http://raw.githack.com/mrdoob/three.js/controls/examples/webgl_shadowmap_performance.html

[mrdoob]

Haven't tested mobile yet.

[mrdoob]

Another option would be to change the lookAt based on the delta from the pointerdown position.
Like the previous beaviour except not hardcoded to the middle of the screen.

[Mugen87]

Haven't tested mobile yet.

Just tested the links on a Pixel 8a with Chrome and the controls don't work. The camera barely reacts on touch input. You just see a single tiny change in orientation when tapping on the display.

I would expect the camera moves towards the tapped location as long as you hold down the finger.

[mrdoob]

Indeed, mobile is broken. Will fix later.