Change Details

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.07 **Blender Version** Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `rBf1cca3055776` Worked: (newest version of Blender that worked as expected) **Short description of error** When using the Principled GGX transmission the fresnel effect does not decrease with increasing roughness as it should. **Exact steps for others to reproduce the error** {F12934718} In this test file only the specular reflection is visible. The gradient going into the roughness input goes from 0 at the top to 1 at the bottom. As can be seen there the fresnel effect does not otne down with increasing roughness. Multiscatter GGX does not have this issue. Apart from that I could not find a single source that documents how fresnel is calculated in the Principled BSDF. If you read this and know that please tell us the source. Thank you and have a great day!

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.07 **Blender Version** Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `rBf1cca3055776` Worked: (newest version of Blender that worked as expected) **Short description of error** When using the Principled GGX transmission the fresnel effect does not decrease with increasing roughness as it should. **Exact steps for others to reproduce the error** {F12934718} In this test file only the specular reflection is visible. The gradient going into the roughness input goes from 0 at the top to 1 at the bottom. As can be seen there the fresnel effect does not otne down with increasing roughness. Multiscatter GGX does not have this issue. Edit: Both Besckman and GGX in the Glass BSDF have the same issue. Apart from that I could not find a single source that documents how fresnel is calculated in the Principled BSDF. If you read this and know that please tell us the source. Thank you and have a great day!

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.07 **Blender Version** Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `rBf1cca3055776` Worked: (newest version of Blender that worked as expected) **Short description of error** When using the Principled GGX transmission the fresnel effect does not decrease with increasing roughness as it should. **Exact steps for others to reproduce the error** {F12934718} In this test file only the specular reflection is visible. The gradient going into the roughness input goes from 0 at the top to 1 at the bottom. As can be seen there the fresnel effect does not otne down with increasing roughness. Multiscatter GGX does not have this issue. Edit: Both Besckman and GGX in the Glass BSDF have the same issue. Apart from that I could not find a single source that documents how fresnel is calculated in the Principled BSDF. If you read this and know that please tell us the source. Thank you and have a great day!