Long paths are a problem for the irradiance map with the “Use camera path” option enabled. They are not much of a problem for the light cache, provided the LC subdivs are high enough.
Only IM max rate and LC subdivs needs to be increased?Yes.
In resume, use camera path can be used on long/complex animations?The light cache can be used, yes. I wouldn’t really recommend the “Use camera path” for the irradiance map in this case.
I’m still confused : i can’t figure why, in Flythrough anims mode, documentation says that use cam path can be used for SHORT flythrough animations in one go.Because it can and is intended to be used this way?
Best regards,
Vlado