Dynamic lighting strange extra shadowing

[anonymous_user_6ea9814e]

Hi

I am having a small issue with dynamic lights. In general I do suspect that this has something to do with eye adaptation effect, but IMO this should not work like that…

So what we have here is a small bathroom, with some baked lighting and thedynamic lights off:

The problem starts when I do turn the lights on. The ceeling gets some strong extra shadow, it gets really really dark:

I did a workaround with some spotlights that are faced upwards and lighting the ceeling, but this means twice as much dynamic lights.

If anyone has any idea what am I possibly doing wrong or has some better workaround ideas it will be very much appreciated. And if anyone from Epic reads this post it would be great if you could check how does this compare with the desired behaviour for this kind od lighting scenario.

[Tim_Hobson]

If I understood correctly, you’ve got dynamic lighting that you’re turning on for the bathroom here but not seeing any light bounce (GI). At the moment there isn’t a good solution for Dynamic GI that is production ready.

Just to clarify some more things with your setup.

You mention you’re using baked lighting. All the lights in this bathroom are Dynamic, right? Is the exterior lighting the only part that is using Static or Stationary lighting?

[anonymous_user_6ea9814e]

Yes, all of the lights inside the bathroom are dynamic. However there is quite a lot of bounced lighting coming in from the window you mentioned and the open door (behind the camera int these shots). The first shot shows this lighting conditions.

I do understand that there is no GI from dynamic lights, what I don’t understand is why does the ceeling get darker after the light go on. It looks like it’s not mixing the baked GI with dynamic lights, it looks like it starts ignoring the baked GI after I turn the lights on.

[jonimake]

Could be that the engine invalidates the lightmaps on the ceiling for some reason. Could you post a screenshot of the settings the lights have?

[anonymous_user_6ea9814e]

Here you go, just ignore the Intensity setting, this is set via Blueprint to 1000.

As you can see, the light settings are pretty much standard

[Tim_Hobson]

I wasn’t able to reproduce this.

I setup a small enclosed room similar to your image. I set the room lights to be all dynamic and triggered by a key press. The exterior directional light is fully static light with intensity set to 50.

The spot lights are using your settings you provided above.

Here is my results:

I’m not sure exactly what is going on to cause that though. I can provide this sample setup if you need to take a look. I didn’t use any real different settings aside from what’s listed above and changing some of the post process effects, but that has no bearing on how the light will be cast and baked for the scene with static lighting.

Can you post a screenshot with your components viewed in the scene. I’d like to see how your spotlights are against the ceiling.

Something similar to this:

[anonymous_user_6ea9814e]

So I did some more testing and I already know what the problem is.

It’s eye adaptation vs light intensity. I was using high light intensity values that were making the eye adpatation go crazy.

The problem I do see here is that once you reach some light intensity level it seems like the actuall amount of emmited light does not follow the values in the input field. Maybe it’s just an impression but it seems like going from 100 to 1000 in intensity doesn’t make that much of a difference as is sugested by the numbers. The eye adapatation however seems to be more sensitive to higher values.

I have reduced the intensity to 50 on each of the lights and the ceeling looks ok. Not as much light in the room as I want it to be, but I guess that it should be good after some fine tuning of the lights’ settings.

Thank you very much for your assistance on this one.