Ambient Cubemap is not appiled to Metallic surfaces while there no other light sources and there is at least one reflection capture actor

Development Rendering
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1

As you can see on below screenshot all metallic surfaces are black. It happen with either my own cubemap or the stock ones. There is single post process volume (unbound).

It also happen when light sources are active (but to less degree, only surface with metallnes on 1 and very low roughness do not pick up cubemap).

I guess it happen due to lack information of indirect lighting, since there is none. As in that particular scene lighting can’t bounce from anything (as there is only single object - gun).

ambientcubemap_bug.png
ambientcubemap_bug.png1253×636 375 KB

2

A similar issue that involves Ambient cubemap and sphere reflection capture was reported here. Epic is aware of it and looking into the issue.

3

Hi Lukasz,

I was able to test this issue and can see it is related to the error that Satheesh encountered. We have a report for this and it is being looked into. Please let us know if you discover any additional details, as they may help us resolve the issue or provide a work around.

Cheers!

Alexander