SkyLight Specified Cubemap Mip not identical

Development Rendering
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1

When I use specified cubemap on skylight, the samplelevel result in reflection is not identical with the cubemap mip. I modified the mipLevel to 2 of GetSkyLightReflection() in ReflectionEnvironmentShared.ush to make sure it sample the miplevel 2, and exclude other lighting components to isolate the reflection.

Is this a bug or something? Cause it effects the roughness of PBR a lot.

227314-shot-2018-01-17-12-31-48.png

UE4 Reflection on miplevel 2

227315-shot-2018-01-17-12-31-57.png

CubemapGen Reflection on miplevel 2

227316-shot-2018-01-17-12-32-02.png

UE4 Texture Display on miplevel 2

2

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks