Nominate a 3D coordinate system

[JulieWinchester]

There seemed to be support in a meeting on 3/21/2023 for just adopting what Three.js uses, based on popularity and ease for developer use

Possible helpful reference: https://discoverthreejs.com/book/first-steps/transformations/

[JulieWinchester]

From IIIF Extra Technical Meeting 3/29/2023:

Initial properties suggested for this 3D coordinate system

• In general, this space conforms to expectations from Three.js
• An infinite three-dimensional space
• Floating-point coordinates define each of the three axes
• Center of the space is at 0,0,0
• Annotations (of any kind) can exist in this 3D coordinate system, with an associated position to be defined through other user stories.
• Three.js coordinate system is +Y up and right-handed (+Z pointing toward viewer)

[JulieWinchester]

From IIIF TSG Meeting 4/19: It may be reasonable to assume/propose the existence of a resource "that is not a canvas," AKA a Scene, to describe the space that is described by the coordinate system above. A scene would be somewhat parallel in usage to a canvas but has significant differences from it (centered at origin, infinite and boundless, etc.).