Fresnel in Daz Studio

AbnerK

Hi, 

I was watching a tutorial on Dual Lobe Spec and noticed that there was no fresnel effect on the object. Can you have fresnel in Daz Studio? I searched the forum but everthing I've found seems to be about a different software. 

 

Thanks. 

Sven Dullah

Don't know about IRay, I don't use it, but the OmUberSurface for 3Delight has fresnel;)

Eagle99

I don't know about 3Delight, I don't use it...  But as Sven said it seem to have something to emulate that effect.

PBRs (Physically Based Renderers) like Iray in DS do handle the light reflected by surfaces like in the real world. Surfaces become more reflective at lower angles.

So the fresnel effect is there by default.

Kind rgards, Eagle99

 

Fishtales

Fresnel is available if Top Coat is selected and you go to Top Coat Layering Mode.

http://docs.daz3d.com/doku.php/public/software/dazstudio/4/referenceguide/interface/panes/surfaces/shaders/iray_uber_shader/shader_general_concepts/start#top_coat_layering_mode

Eagle99

Fishtales said:

Fresnel is available if Top Coat is selected and you go to Top Coat Layering Mode.

http://docs.daz3d.com/doku.php/public/software/dazstudio/4/referenceguide/interface/panes/surfaces/shaders/iray_uber_shader/shader_general_concepts/start#top_coat_layering_mode

Yes, saw that as well. The only thing you really find about fresnel in the docu....  But it looks to me like just one mode for the top coat, where you can control the refraction of the top coat with an IOR setting. The effect in general should always be there, top coat or not.

andya_b341b7c5f5

You can isolate and see the Fresnel effect most clearly if the Glossy Layered Weight is set to 1 and Glossy Reflectivity is at zero and there are no strong light sources to the sides or above the object (using the PBR Metallicity/Roughness Base Mixing here and Sun-Sky with the Sun node behind the plane at the back of the sphere).  Admittedly not very realistic - you would normally see some reflection of the light from in front of a shiny object like this.

Sven Dullah

Eagle99 said:

I don't know about 3Delight, I don't use it...  But as Sven said it seem to have something to emulate that effect.

PBRs (Physically Based Renderers) like Iray in DS do handle the light reflected by surfaces like in the real world. Surfaces become more reflective at lower angles.

So the fresnel effect is there by default.

Kind rgards, Eagle99

 

Touche:) I forgot to mention that physically plausible shaders like aweSurface for scripted pathtracing in 3Delight also has it, that's what I use for my renders atm. Yeah it should always be there, but with awe you have a toggle on/off for glossy fresnel and a slider for roughness at grazing angles.

JonnyRay

For Iray, I would recommend playing with the Caustic Sampler in the Optimization section of your Render Settings. Since that sampler adds fine details for more realism to reflection and refraction of light, there's a good chance it could affect fresnel based reflections as well.

AbnerK

Thanks all for your time in answering the question. I only use iRay, I've seen some utterly awful renders with 3Dlight, it looks way more complicated than it needs to be for the extra saving in time of a render you get so I'll probably never try to get my head aroud that. It didn't occur to me that the tutorial may have been using 3Dlight. My rendering isn't thtat fast to do tests but I will now to be sure. Thanks all for you input. It has helped and it is encouraging. 

AbnerK

Thanks, I didn't have a chance to read all replies. I played with the settings today using the Top Coat settings etc.  It's a very slow render since it has everything on so I won't use it very often. :)