Ryan O'Connor (rocifier)
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Fri, Nov 10, 6:23 AM (1 w, 3 d)

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Tue, Nov 14

Ryan O'Connor (rocifier) added a comment to T53283: Unexpected Fresnel Factor with Principled BSDF.

Hi Brecht, thanks so much for the suggestion, the problem seems to be that my normals in particular cases were flipped. I can reproduce it in blender by manually flipping the normals. Please close this for now and I will re-open if I have further problems.

Tue, Nov 14, 9:51 AM · Cycles

Sun, Nov 12

Ryan O'Connor (rocifier) added a comment to T53283: Unexpected Fresnel Factor with Principled BSDF.

I have been unable to reproduce this in the current version of blender yet. Was there any updates to the principled shader between 1.79 and 1.79.1?

Sun, Nov 12, 9:19 PM · Cycles

Sat, Nov 11

Ryan O'Connor (rocifier) added a comment to T53283: Unexpected Fresnel Factor with Principled BSDF.

OK I will try to reproduce this problem in Blender. Currently I am experiencing it when using the cycles API directly.

Sat, Nov 11, 12:53 AM · Cycles

Fri, Nov 10

Ryan O'Connor (rocifier) added a comment to T53283: Unexpected Fresnel Factor with Principled BSDF.

Original V-Ray scene

Fri, Nov 10, 10:32 AM · Cycles
Ryan O'Connor (rocifier) added a comment to T53283: Unexpected Fresnel Factor with Principled BSDF.

Example showing the Fresnel node with expected smooth Fresnel response

Fri, Nov 10, 10:02 AM · Cycles
Ryan O'Connor (rocifier) updated the task description for T53283: Unexpected Fresnel Factor with Principled BSDF.
Fri, Nov 10, 9:59 AM · Cycles
Ryan O'Connor (rocifier) added a comment to T53283: Unexpected Fresnel Factor with Principled BSDF.

Example on water surface using Principled BSDF as a volumetric shader. IOR is set to 1.33 and Specular to 0.5

Fri, Nov 10, 9:54 AM · Cycles
Ryan O'Connor (rocifier) created T53283: Unexpected Fresnel Factor with Principled BSDF.
Fri, Nov 10, 6:33 AM · Cycles
Ryan O'Connor (rocifier) added a watcher for Cycles: Ryan O'Connor (rocifier).
Fri, Nov 10, 6:25 AM