source files: [xc]lgt.[ch]
(SEND <light> :FRAME-THINGS [:THINGS <thing-list>] [:FRAME-TIGHTLY t])
Exactly like the camera :FRAME-THINGS command. This can occasionally be a useful way to position a light.
If :THINGS is not provided, it should be present as a property on either the <light> or else the MATRIX44 transform used by the <light>.
See :DRAW cmr docs for a description of <thing-list>s.