USD: improve light units conversion #109795

Manually merged

Brecht Van Lommel merged 4 commits from brecht/blender:usd-light-units into main

2023-07-07 18:27:19 +02:00

Author	SHA1	Message	Date
Brecht Van Lommel	7c34688e73	Better handling of point lights, add spot light export	2023-07-07 14:59:56 +02:00
Brecht Van Lommel	d417968af2	Make normalized distant lights match Karma more closely	2023-07-06 21:21:37 +02:00
Brecht Van Lommel	053fd7850f	Fix wrong unnormalized disk light	2023-07-06 21:03:25 +02:00
Brecht Van Lommel	f35d1a6278	USD: improve light units conversion Use pi factor to convert from radiant flux to intensity, and fix wrong unnormalized point/sphere light unit in Cycles. Overall it should be much closer now for all lights. But point and distant lights are still off and seemingly without a consistent convention in other Hydra renderers. Ref #109404	2023-07-06 20:08:39 +02:00