OrbitControls example: modify scene

[WestLangley]

Make the scene a bit more OrbitControls-compatible.

[clement-igonet]

From my point of view, a convenient "panning" would be to have a move parallel to your pyramid ground. It's like if the ground were sliding, in a parallel move relative to itself.
So, orbital move should not change height of your sphere center
I would add axes representation to help the understanding.
In that way, you should not be able to move the camera under the pyramid ground.

[WestLangley]

a convenient "panning" would be to have a move parallel to your pyramid ground

Agreed. That is how OrbitControls panning should have been implemented. Currently, OrbitControls pans in screen-space, just like TrackballControls.

The suggested panning method is set as the default in an upcoming re-write of the class.

[clement-igonet]

Good to hear you understand me 😀 Do you want me to suggest an implementation ? -- Sent from my mobile. It explains my brevity.

[WestLangley]

That will not be necessary.

[clement-igonet]

From my point if view, panning is out of scope. It extends orbit control, but it is not orbit control. And also, its implementation is finally too dependent on object (a plan) into the scene. Imagine the case of a planet navigation: we would like to rotate a sphere rather than to slide a plan. I would suggest to let to the user the ability to implement his/her own extended control relative to his/her context. So, pan() function could be externally defined if needed. It's what I tried to do in a "monkey" style. 😀

[WestLangley]

OrbitControls is not part of the library -- it is part of the examples. Users are free to modify the class as they see fit.

[clement-igonet]

OK. However, all webgl examples rely on OrbitControls "example"... :-) That's why I suggest to consider that OrbitControls improvement has high value. I guess also that examples could become part of core lib if well done. So improvement is welcome.

[clement-igonet]

I've suggest a fix for panUp move here: #12727.
Demo here.
What do you think ?

[mrdoob]

Thanks!