4.19 Physical Lights

[Xharthok]

@Daedalus51

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Also, in relation to why realworld values are great…let me give you the following example:

I did some lighting on Theed City, Naboo for Battlefront 2. So lets look at a shot here

So…this is a sunny setting with pretty strong lighting and a bright sky…so what do I know?

I know that I need a sunlight intensity of around 125 000 lux
I need a MAX EV value of around 16 based on the sunny 16 rule
We also measured sky luminance for different settings so I know that the sky like I want it should be around 5000 cd/m[SUP]2[/SUP]

With all this data, setting up the lighting for Naboo becomes a **** cakewalk!

First, I tweak exposure to be EV 16 and I crank up the sunlight to 125 000 lux. Then, I add an HDRI skydome and turn on the exposure viewmode that has a square in the center of the screen…inside that square, it measures luminance and shows me the value. I look at an average spot on the sky with the square and bump up the sky brightness until the number in the square reads 5000 cd per square meter.

DONE!

Now my local lights will AUTOMATICALLY ALWAYS be correct since they use lumens and all these values work in relationship. Now I can focus and the actual ART of lighting instead of getting the **** basics done. This whole thing took me less than 10mins to setup and it looks almost perfect right out of the box!

So why exactly can’t we have something like this? Can anyone give me a really good reason to NOT do this?

Cheers!

THANKS for sharing your settings!! Beautiful lighting.
So the sky brightness in this scene is 5000 cd per square meter. What value would this be in lux? Lux is lumen per square meter and the internet seems to suggest that I can simply convert 1:1, therefore 5000 lux? This would be suspiciously simple. So the skylight has 4% the intensity of the sunlight?