Principled shader reflection funkyness

Forums Technical Discussion Principled shader reflection funkyness

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Siavash Tehrani: Member; 710 posts; Joined: July 2005; Online

Sept. 24, 2016 6:33 p.m.

In the first image, Reflect is set to 0. In the second image it's set to 0.001.
Everything else is set to the defaults. What's happening here, is it a bug?

Attachments:
1.jpg (23.2 KB)
2.jpg (27.0 KB)


Felix6699: Member; 45 posts; Joined: Aug. 2012; Offline

Sept. 25, 2016 7:46 a.m.

I think it's all because of the Fresnel parameter, which does not interact in the shader. If you will play with it, you will get the desired result.

Attachments:
fre.jpg (50.9 KB)


tamte: Member; 8531 posts; Joined: July 2007; Online

Sept. 25, 2016 2:49 p.m.

Reflect 0 means Reflection is turned Off

otherwise Reflect controls only reflectivity of the surfaces facing the camera.
High incident angle reflections are always 1, hence the jump since 0.0001 means the falloff from 0.0001 to 1, which is big jump from 0-0

in other words it's alternative artistic control over reflection IOR

Edited by tamte - Sept. 25, 2016 14:53:03

Tomas Slancik
FX Supervisor
Method Studios, NY


Siavash Tehrani: Member; 710 posts; Joined: July 2005; Online

Sept. 25, 2016 4:28 p.m.

Thanks a lot tamte, that makes sense. I misunderstood the purpose of the Reflect parameter.

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