Eevee emission reflections disappear when out of view

Question

I can't seem to get my emission shaders' reflections to cast on my model unless the emission shader's surface is actually in view.

Here I obscure the view of the surface I have the emission shader on from the first image and it no longer casts light on the rest of the model above it.

I assumed I need an irradiance volume to get the reflections to work but after baking I still don't get any light out of it.

I'm sure I'm missing something here but after extensive searching I just can't figure it out. Would appreciate some help.

Edit: As far as I can tell, an irradiance volume should solve this issue, but it simply doesn't. Maybe Eevee isn't able to cast emissions if the emission itself is out of view but I can't find confirmation on that anywhere.

Edit 2: After more testing I still can't figure this out and I haven't received any useful replies. I'm fairly confident now that there's no way around this issue until the developers provide a solution.

Possible duplicate of EEVEE ignores light-emission outside of the camera frame — Duarte Farrajota Ramos, Apr 06 '19 at 00:28
https://blender.stackexchange.com/questions/126602/screen-space-reflections-in-eevee/ and https://blender.stackexchange.com/questions/133780/cant-see-a-glass-object-through-another-glass-object-in-eevee/133790#133790 also https://blender.stackexchange.com/questions/128162/how-do-the-new-light-probes-in-eevee-work/ — Duarte Farrajota Ramos, Apr 06 '19 at 00:30
I've read through all of these posts and they all lead me to believe that baking in an irradiance volume will solve my issue, but it doesn't. Just tried it again and I still get the same results, no orange light is cast onto my model if the emission area is obscured, even after baking. I've even tried making my irradiance volume very dense and it still doesn't produce a different result. — John Abraham, Apr 06 '19 at 04:48

score 0 · Answer 1 · answered Apr 06 '19 at 07:43

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Overscan can help a little bit. You can turn it on in the render settings>>film. The max value with typing is 50%, so the range of the reflection visibility will be increased by a half image.

answered Apr 06 '19 at 07:43

FFeller

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That doesn't seem to do it either. I think that will only reflect the object itself, not its light. – John Abraham Apr 06 '19 at 15:05

score 0 · Accepted Answer · answered Apr 19 '19 at 23:13

You seem to be mistaking your bloom effect with indirect lighting.

^{Left: Indirect lighting, Right: Bloom}

Bloom will not be visible once an object disappears from view (e.g. when the camera angle changes). The indirect lighting is very faint in your example since the emissive area is very small and the illumated surfaces are at a 90° angle.

However, even increasing the brightness of the emissive material won't help much if the samples of the light probe are too few. You will quickly get unnatural artefacts.

A solution could be to use a very dense light probe and a very bright emissive light. You will have to reduce/adjust the bloom effect which will be even brighter then.

Many samples.

But as you can see, there are some artefacts. Light probes are not very useful for very small emissive lightemitting meshes. A real solution would be, to reproduce the emission with normal lamps.

Thank you for the detailed explanation. That makes total sense. I was forgetting about the bloom effect. It's unfortunate that bloom can't be baked in like other indirect lighting. I will have to find a workaround. — John Abraham, Apr 20 '19 at 03:17

Eevee emission reflections disappear when out of view

2 Answers2