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iRay - eyes look unnatural

Joe_88816Joe_88816 Posts: 9
edited December 1969 in New Users

Hello,

I'm discovering the new iRay render in DAZ3D Studio 4.8 and my first try-outs look very promising. The characters that I render look photo-real, except for their eyes : they look like they are stuck in an unnatural stare. In the past I've been using Reality with LuxRender, and the eyes look much more realistic.

Since both are unbiased renders I'd figure that it must be possible to approach LuxRender quality. I've found some great renders on http://www.daz3d.com/gallery/#galleries/123613. These look very natural, but I can't figure out how to achieve this quality. According to the explanation on the website, they are just simple Genesis 2 figures, however when trying them out, they keep rendering with "frozen" eyes.

What can I do to optimize this ? Do you have some examples before/after correction ?

Thanks for the help.

Best regards,


Joeri

Comments

  • SickleYieldSickleYield Posts: 7,644
    edited December 1969

    Could you show us a render that has the effect you're trying to avoid? It's hard to help otherwise.

    A lot of those renders are Mec4D's. She has talked extensively about eye shaders in the Show Us Your Renders threads, but especially about having the right refraction values for the cornea (1.38 to 1.41, depending on which part of the cornea you decide to imitate, refraction-wise; there are arguments) and the eyereflection layer (1.44, so it looks like water over the eye surface). It's also good to turn on the corneal bulge morph to get better reflections.

    If you want characters to look like they're looking at the camera, use the "point at" option from the Parameters tab with the eyeball selected. If you feel characters look hostile or dull, use the "pupil dilate" morph too. Dilated pupils automatically make a person look friendlier toward what they're looking at.

  • Joe_88816Joe_88816 Posts: 9
    edited December 1969

    Thanks SickleYield,

    I've tried several of your recommendations and the eyes now look at lot more "alive". Here's an example of a basic Michael6 figure with iray's water shader preset applied to the cornea and eyereflection surfaces.

    Regards,

    Joeri

    Test_Michael_6_-_with_eyes_ok.png
    1920 x 1080 - 1M
  • mjc1016mjc1016 Posts: 15,001
    edited December 1969

    And if you don't have one of the morph packs that include the cornea and pupil morphs, I made a set (still haven't transferred them to G2M, yet) for G2F....

    http://www.sharecg.com/v/80769/browse/21/DAZ-Studio/G2F-Eye-Morphs

  • SzarkSzark Posts: 10,634
    edited December 1969

    first off forget the eye reflection, just hide it by making it 100% transparent (cutout function).

    Cornea use a refraction of 1.54 and play with the refraction strength until looking right. It might be a case of 100% is right. Personally I have done any characters in Iray yet but the Thin Water shader might work just adjust reflection IOR to suit.
    Sclera treat as Skin but more glossy than skin. The reflections shouldn't be as strong as the cornea though..

  • SickleYieldSickleYield Posts: 7,644
    edited June 2015

    Szark said:
    first off forget the eye reflection, just hide it by making it 100% transparent (cutout function).

    Cornea use a refraction of 1.54 and play with the refraction strength until looking right. It might be a case of 100% is right. Personally I have done any characters in Iray yet but the Thin Water shader might work just adjust reflection IOR to suit.
    Sclera treat as Skin but more glossy than skin. The reflections shouldn't be as strong as the cornea though..

    Using it as a wet layer over the eyeball works pretty well. I wouldn't completely write it off (contra my first belief about this layer) unless it's really over-reflecting in your scene.

    One can always experiment, but 1.54 probably isn't the best value for the cornea. This scholarly article is the one most of us are going from when we suggest 1.38 to 1.41:

    http://www.ncbi.nlm.nih.gov/pubmed/7634138

    Post edited by SickleYield on
  • SzarkSzark Posts: 10,634
    edited December 1969

    Yeah 1.54 is wrong, sorry about that, just shows I can't rely on my memory. :)

  • mjc1016mjc1016 Posts: 15,001
    edited December 1969

    Szark said:
    Yeah 1.54 is wrong, sorry about that, just shows I can't rely on my memory. :)

    1.54 makes a great crystal goblet, though.

  • BeeMKayBeeMKay Posts: 7,019
    edited June 2015

    http://www.daz3d.com/forums/viewreply/817055/

    I use that as a base, and then do some fine tuning of my own.

    Post edited by BeeMKay on
  • SzarkSzark Posts: 10,634
    edited December 1969

    mjc1016 said:
    Szark said:
    Yeah 1.54 is wrong, sorry about that, just shows I can't rely on my memory. :)

    1.54 makes a great crystal goblet, though.LOL I knew it was an IOR for something. :P

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