4.19 Physical Lights

[Daedalus51]

@Nepfish

The eye shader is broken due to it looking at the scene color (which gives incorrect results when pre-exposure is turned on). So unchecking pre-exposure will fix that or an even better solution is to simply divide your result in the shader with a EyeAdaptation material node. This takes the correct exposure in mind and adjusts it accordingly.

An annoyance of this new physcial based lighting workflow are 3D widgets and other unlit UI shaders (VR comes to mind), because they are affected by exposure values. They will look vastly different in every scene because of the huge varying EV values. They will be either too bright or too dark depending on whether you have a night or day scene. Sure it can be easily fixed by adding the EyeAdaption node I mentioned above but it’s something people will have to know it exists ^.^

Well…it was also said that pre exposure needs to be turned on to fix the other issues or am I actually mixing this up now?

Regarding unlit materials, thats exactly how it should be!

We had the same issues on Star Wars as the lightsabres use a unlit material with emissive! In reality, if they would have a static value, like our unlit shader, you wouldnt see the lightsabres during day but they would glow strong during night! In movies, they fake it per shot…so using the exposure node in the shader is exactly the correct option for gameplay purposes

So I am quite happy for all these things falling into place like this