Dome Light options problem

[Jiri.Matys]

Hi, I have a scene where I have two dome lights - one for lighting and one for background and reflections. So far so good, but on render I have two shadows (see pic).
Its caused by specular, so I tried to fix that by tick Affect Specular on dome light with Affect Diffuse (the one which is used for lighting and its invisible for background) and untick Affect Specular on the other one (which I wanna use for reflections and background).
When I do that, second shadow is gone, but I see wrong dome in reflections even I didnt change affect reflection.

Please how can I solve this?

[Jiri.Matys]

One more thing, its weird that I have to enable both Affect Specular and Affect Reflections to actually see the reflections on glass. When I enable only Affect Reflections, reflections are not visible.

[Jiri.Matys]

So I found a bug probably, look at this video:
https://drive.google.com/file/d/1d-L...ew?usp=sharing

I dont hide/unhide one of the dome light. I just changing glossiness of a glass material. With 0.99 and 1.0 there is clouds (first dome light). With 0.98 and lower there is trees (second dome light).

[Jiri.Matys]

Please, anyone from Chaos? Is this normal behaviour? Thank you.

[Garryclarke]

Hi,

I'm running into this problem as well, For simple scenes I use 2 Dome lights with an HDRI, one with diffuse and the other with reflections only. But recently, I don't remember when, I've noticed that the reflection only light doesn't do anything and I have to add specular to get the reflections to work.

So to break it down.
Diffuse only = works as expected
Specular only = I get reflections with any material that does not have 1.0 as the glossiness eg .99 is fine
Reflection only = totally black
Specular & Reflection = this will switch on the reflections


I'm a bit confused as to the difference between specular and reflection.

[^Lele^]

I have a question: why use two domes, at all?
What's the benefit, particularly for the reflection/refraction parts, which won't benefit from IS or the adaptive dome?
I would use an environment, and a black GI override, to achieve the same.
Why not do so?

[glorybound]

The reflection is now in the specular.

[Garryclarke]

The reflection is now in the specular.

I wouldn't mind if the reflections were ALL in the specular but they're not.

Any reflections set to 1.0 will only show when the specular and reflection are both switched on.
All other reflections (less that 1.0) will show with the just the specular on.

I use 2 seperate dome lights so I can control the amount of reflections easily, just lower the strength of the light and it dims the reflection, easy.
I know it's not physically correct but a lot of time I'm just wanting something to look nice.

For a lot of my scenes I light them like this:
Dome (for illumination) - light blue - (0.7) - Diffuse only
Dome (for reflection) - HRDI - (1.0 ish) - Reflections only
Spot (aligned with sun in HDRI) - light yellow - (0.7) - Diffuse Only
No GI

Of course it's not quite as pretty as scene illuminated with an HDRI but it's much quicker. Most of my jobs need to be animated and saving a few secs here and there can make a big difference. The last project I worked on went through a lot of revisions and there were over 10,000 frames in my render directory when I finished. Speed is king.

[fixeighted]

EDIT: Deleted as this isn't quite what I was thinking.

[Jiri.Matys]

I have a question: why use two domes, at all?
What's the benefit, particularly for the reflection/refraction parts, which won't benefit from IS or the adaptive dome?
I would use an environment, and a black GI override, to achieve the same.
Why not do so?

Hi Lele, I tried only one dome light and environment for reflection but it still didnt help, problem persist. Now I tried black GI override in settings and it didnt help either.
Problem is that I have to leave Affect Specular checked in dome light for right lighting and specular in a scene. But when I leave it on, problem with reflection is there no matter what I try to change.

[^Lele^]

Does turning consistent lighting elements off help?

[Jiri.Matys]

Does turning consistent lighting elements off help?

Unfortunately this didn't help.

[Jiri.Matys]

If you want, I can send you a test scene Lele.

[^Lele^]

It's best if you send it to support, they'll be closer to the metal than i am, if this was a bug.
Rest assured they are reading, but just for completeness, also mention the thread.

[Jiri.Matys]

Scene sent to support.