OptionalmetadataCan hold information like color, opacity, points colors, collision_allowed, etc...
OptionalphysicalOptionalposethe pose of the above reference frame with respect to a different observer reference frame
the name of a given reference frame
The UUID of the transform
PlainMessage strips all methods from a message, leaving only fields
and oneof groups. It is recursive, meaning it applies this same logic to all
nested message fields as well.