Snap to camera view key modifier

[lknknm]

Is your feature request related to a problem? Please describe.
As an extension to the features described on the issues #14 and #885, it would be nice if we could use a modifier to snap the camera orbit to a camera view, also similar to Blender.

Describe the solution you'd like
Camera should be able to snap to Front, Right, Left, Rear, Top or Bottom view using Ctrl + mouse camera rotate depending on the mouse movement.

Describe alternatives you've considered
In the future we can implement user options to change hotkeys preferences, as previously discussed.

Additional context
See Blender camera navigation manual as an example: https://docs.blender.org/manual/en/latest/editors/3dview/navigate/navigation.html#orbit

[snoyer]

I find Blender's drag-and-snap a bit jerky visually :( am I doing it wrong?

blender-drag-snap.webm

I like Solvespace's "Nearest Ortho View" and "Nearest Iso View" features better both visually (smoothly animated) and from a UI point-of-view (key press rather than mouse drag modifier)

solvespace-nearest-view.webm

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My suggestion for F3D would be: have a configurable "camera snapping angle" and when the key is pressed round the azimuth and elevation of the camera to the nearest multiple. The configurable snapping angle could be set to 90° for only axis-aligned/ortho views, 45° for both ortho and iso views, or any other angle if appropriate for a given usecase/model.
In addition pressing the key repeatedly would cycle through the snapped views without having to drag in between.

[snoyer]

spinny-ducky-90.webm

spinny-ducky-45.webm

[lknknm]

@snoyer What hotkey are you using to camera snap? If you hold alt + mwheel-drag in Blender you'll get something like the following:

Having in mind that when you do that in Blender, it snaps automatically to orthographic view. I don't think we necessarily need it to be Ortographic. In my opinion it would depend on whether the Ortographic Toggle is on/off.
We could use any modifier for that, being shift, alt or ctrl.

[mwestphal]

Lets wait for #443