sampledEnvironment property
The environment a useEnvironment shader samples, overriding the scene's.
Null (the default) samples the scene's active environment. Set a fixed
map when this same sky drives the scene's lighting through a
SkyEnvironment: the scene's environment then holds the sky's own
bake, and without an override the bake pass substitutes an empty
environment (a sky cannot sample the environment it is producing). A
fixed override is safe there, so both the background draw and the bake
sample it.
Implementation
EnvironmentMap? sampledEnvironment;