[x3d-public] Viewpoint centerOfRotation global or local

[Don Brutzman]

To maintain momentum towards ballot, have added the following (flagged as editorsNote for continuing review/improvement if needed).

On 12/5/2020 9:16 PM, Don Brutzman wrote:
> Simplest specification revision is to add a sentence to 23.3.1 X3DViewpointNode stating,
> 
>      "The /centerOfRotation/ field is in the same local coordinate system as the current viewpoint node's /position/ and /orientation/ fields, in accordance with _4.3.5 Transformation hierarchy_.

* X3D4 Navigation component, 23.3.1 X3DViewpointNode
   https://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/navigation.html#X3DViewpointNode

Cosmetic: am expecting that Dick and I will also sort the field descriptions in this clause, alphabetically by name.

Also checked Mantis and found you had reported this issue in 2015 and it never got resolved (ouch).  Have flagged it as X3D4, updated, ready for final review.

* Mantis 811, 23.3.1 X3DViewpointNode - Clarification of centerOfRotation
   https://www.web3d.org/member-only/mantis/view.php?id=811

Noted related issue which can also be reviewed for completion:

* Mantis 1194, 23.4.4 NavigationInfo VIEWALL (or X3DViewpointNode viewAll) should be a required navigation behaviour
   https://www.web3d.org/member-only/mantis/view.php?id=1194

Thanks, keep 'em coming!  8)

all the best, Don
-- 
Don Brutzman  Naval Postgraduate School, Code USW/Br       brutzman at nps.edu
Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA   +1.831.656.2149
X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman