4.19 Physical Lights

[iniside]

@Daedalus51

Man I would be so up for this!

Although careful! The skylight brightness should NOT be related to the directional light at at! The skylight should always sample the skydomes brightness and should not have a brightness itself as thats confusing. For artistic needs there can be a multiplier to make it artificially darker or brighter, but it should not have a brightness slider in lux or whatever. So basically the way it is right now is perfect if people stop using the brightness as brightness. Just leave it at 1 and increase your sky brightness by either multipliying your HDRi up in your material OR by increasing the Directional Light intensity which makes the atmospheric fog brighter (there is your sun sky relationship!)

You dont want to link skylight brightness do directional light brightness as again, the important relationship is how the sun affects the skydome, the skylight just samples whats there. So you want the sunlight to have an effect on the skydome! Of course thats not happening when using HDRs, which is why sunny 16 and measured values become more important and otherwise, when using the physical sky via atmospheric fog, it works exactly like that already…so thats great!

Regarding your last post…sooooo Epic is already secretly rewriting the system? Or do you mean something else by lighting model? Super curious now^^

​​​​​​​Cheers!

IDK I haven’t looked at code, but the value you provided in one post (125000 for sun 16/EV) and scene is just white, regardless if there is SkyLight on scene or not. I guess something changed.

Yes, that’s what I meant. That brigthness of sun should controll brightness of sky, which should in the end controll brightness of ambient light over scene. Right now for me it was pure guess work to get something reasonable to work in 4.20. I ended up using Auto Exposure, directional light at 5 and Skylight 0.3-0.4,