The sun's center has a darker spot in reflections

[Seppe Dekeyser]

Describe the bug
When looking at the sun through a reflection, the sun's center has a black pixel. After attaching Nsight, I saw that the light_gbuffer.hlsl shader outputs inf for the pixel in the center of the sun's reflection.

I 'fixed' it by clamping the shader output between zero and a large value, but I don't properly understand all the PBR shader code so I don't know a more correct way of fixing it.

To Reproduce

1. Go to this commit on main: 6145eaa (the latest at the time of submitting this bug report)
2. Load a model with a mirror-like reflective surface (I used the car.ron scene)
3. Rotate the sun so that it's visible in the reflection
4. The sun has a dark spot in the center.

Expected behavior
The sun's center should not have a darker spot like that.

Screenshots

Device:

• OS: Windows 11
• OS version: 21H2 build 22000.739
• GPU: 3080 Ti
• GPU driver version: 516.59
• rust version: rustc 1.64.0-nightly (ddcbba036 2022-06-29)
• cargo version: cargo 1.64.0-nightly (dbff32b27 2022-06-24)