Normals appear to be incorrect

[carstenschwede]

It looks like the normals appear to be calculated incorrectly.
When used in combination with an environment map and a reflective material it becomes apparent:

[carstenschwede]

Vertex normals are fine. Seems to be an issue with the envMap shading.

[pailhead]

Ouch, i totally neglected this repo. Curious issue, since the normals seem to be correct. There have been many differet (better) implementations of this, so it might be worth revisiting this whole approach.