2.1.1355 Part 4 Section 220.127.116.11, lightRig (Light Rig)
a. The standard states that the lightRig element defines the light rig associated with a table.
In Office and the schema, the lightRig element is used to specify the lighting for any 3D scene.
b. The standard does not describe any interplay between attribute dir and child element rot.
In Office, if the child element rot is specified, it will override the dir attribute of this element.