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#ActualMJP

Posted 04 November 2012 - 06:10 PM

Well not necessarily at just grazing angles, but for whatever viewing angles that cause your specular BRDF to produce a higher intensity. If you're using a physically-based BRDF the specular should be quite bright relative to the diffuse contribution, even for materials with a low specular response at F(0). Here's a picture showing a surface with F(0) = 0.05 with a Beckmann NDF with a nearly head-on angle, and another picture showing the response at a grazing angle:

[attachment=12080:Specular.png]

[attachment=12081:Grazing.png]

Using a light intensity should be totally fine, as long as you use the same intensity for your diffuse and your specular.

#1MJP

Posted 04 November 2012 - 06:09 PM

Well not necessarily at just grazing angles, but for whatever viewing angles that cause your specular BRDF to produce a higher intensity. If you're using a physically-based BRDF the specular should be quite bright relative to the diffuse contribution, even for materials with a low specular response at F(0). Here's a picture showing a surface with F(0) = 0.05 with a Beckmann NDF with a nearly head-on angle, and another picture showing the response at a grazing angle:

[attachment=12080:Specular.png]

[attachment=12081:Grazing.png]

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