"Jerk" when panning

[mikepianka]

When panning in the viewer with the inertia setting enabled, the is an odd visual "jerk" on release of the click where inertia takes over. See below video of the playground example.

With inertia setting on:

inertia.mp4

With inertia setting off:

no_inertia.mp4

[mistic100]

If you have an implementation proposal feel free to contribute. Personnally I was never able to fix this.

For the reference, both "competing" librairies, Panolens and Pannellum, have similar problems.
In PSV in only happens when doing a short & fast move and release the mouse button before ~500ms.

[mistic100]

Okay so... the code managing the inertia was 5 years old, and utterly flawed. I am even suprised it worked at all.

Now it is fixed

[mikepianka]

@mistic100 your change definitely helped. I made PR #726 which should make it even smoother. I think the key is using an easing method with a more linear start to avoid an acceleration bump for small mouse moves.

[github-actions]

This feature/bug fix has been released in version 4.7.1.