Show Us Your Iray Renders. Part II
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Nice work Stefan and I like the last render bellow mostly , but I see still the dark edges on the skin , what does not blend it well with the backdrop , forgot about Scatter and transmit on specular and top coat ?
don't use index/IOR on pupils it will glow red passing the translucency from the head skin , I was there with it before ..
it is the best to use double values on the Cornea, to represent also the liquid inside between cornea and iris IOR 2.66 , it will create a hell of reflection so may reduced , the eye lens is behind the iris it does not matter here
Your words in gods (or better the artists) ears. They may work in 3Delight, but used in Iray they're horrible.
I made several sets with a different level of vibrancy reduction (-20, -30, -40, -50, -60) and rendered them in a Sun-Sky Environment (Elevation 35.0, Azimuth 45.0).
The last render (3rd image on the right side) is the "standard" approach of dealing with translucency: diffuse texture simply slapped into the Translucency Color slot. Just for comparision.
From the reducted ones I liked the -50 most, and so I did a quick "Pixar" of that, too. :)
I'd also like to post a list of the several refractive index/IOR values from my research and the corresponding specular color values for those who don't want to calculate them themselves. When there was no explicit value available, I used those of the basic material they're made of.
The pupils are tricky: although they're just holes in the irises and so one might think they would have an IOR of 1.0 and a specular color of 0.0, but there isn't really a vacuum in there. The "hole" is filled with a fluid, and this one has a refractive value. I added the value for the human lens, which is almost directly behind, for those who want to use this one instead that of the fluid:
Bodypart Refractive Specular Color ("Glossy Specular")
Index/IOR (linear sRGB)
---------------------------------------------------------------------------------------------------------------
Cornea 1.376 0.0250430
EyeReflection,
Tears; 1.336 0.0206890
1.3365 0.0207410
1.337 0.0207940
Skin 1.41 0.0289420 (Low Reflectance Skin)
1.42 0.0301210
1.43 0.0313130
1.44 0.0325180
1.45 0.0337360
1.46 0.0349660
1.47 0.0362080
1.48 0.0374610
1.49 0.0387250 (High Reflectance Skin)
Hair,
Eyelashes,
Fingernails; 1.54 0.0451980
1.55 0.0465210
1.56 0.0478520
Irises 1.43 0.0313130 (Collagen, hydrated)
Pupils 1.336 0.0206890 (Watery fluid "aqueous humor")
[Lens 1.406 0.0284750]
Sclera (Base) 1.337 0.0207940 (Gelatinous "vitreous humor")
Sclera (Top Coat) 1.43 0.0313130 (Collagen, hydrated)
Teeth 1.6510 0.0603040 (Hydroxylapatite; this also has a "Refraction Weight" of 0.0070)
Thanks for the charts Stefan
with the reminder that all Specular color should be Gray Scale , no specular colors on other than on Iron man figures lol
Hi Cath...or any one else that can help me out...
Sorry for barging in like this...but i did not know where else to post this:
I am having trouble rendering character eyes in Iray...
(please view at full resolution)
This render was actually done in about five minutes...but i intentionally had to let it bake further about twenty minutes to see if the eye surface would get any better...but if you look closely...even after 20 min. there is still noise and grain on the eye surface...and the over all look is not good either...the sclera is greyish and dark.
Settings:
Dome & Scene
Finite sphere
Env map:
Footprint Court IBL from HDR LABS
Is there a way to make eyes look good in Iray?...any special setting?...
thx for viewing.
That's wacky.
It almost looks like you used Dispersive water... if you did, don't do that, use Thin Water.
I am using just water for the cornea for quick render from far , do not use any water on the eye reflection surface use Thin glass
if you still have problems and not using bulge morphs on the cornea use just Think glass on both , the higher amount of refraction will cause noise problems like that as there is low space between the lower surface and the reflective surface creating it much darker as it should, I hope it helps
I made test with my non texture based shader with Cory ;)
1 the original as you know him
bellow my version with universal skin for that reason I added the eyebrows
also my eyes morph with PBR materials and quick hair in Zbrush with my Unshaven shader for beard and hair
I think he looks much cuter
render time 4 min for each
Using Macro skin in ways it wasn't intended... on a man in Iray. ;)
A Physically correct eye (And the Genesis 2 eyes aren't perfect but aren't bad.) should have thin water on the Reflection surface (Simulating the thin layer of water that coats the eye) the tear and the Cornea. The Cornea though should have an index of refraction of around 1.37.
You're welcome. :)
Yes, of course, the corresponding specular color value has to be applied to the Red, Green and Blue color channels alike.
Don't mix them, folks. ;-)
1.38 on most of the lists I've seen...it's really something much more complex, though.
http://www.ncbi.nlm.nih.gov/pubmed/7634138
But how you would handle that with a single thickness model...well, a tri-layered shader (or dual with topcoat).
Now would the three layers be noticeable in a render? Probably not unless it was a pretty tight shot...of course that also assumes a more accurately modeled eye...which would need to include a lens and define interior volumes.
The fluid behind the cornea should be 1.33 IOR (same as water)...it's known as the aqueous humor, and is mostly water.
Another variation of Macro Skin on a guy
You forgot the the liquid between the iris and Cornea (that don't exist in the model ) so just cornea 1.37 is not enough for the volumetric effect
Genesis 2 eyes are ok , but people need to use the correct morphs on them and not as the base genesis 2 , DAZ made cornea bulge but not iris morph in the evolution morph package if I good remember , using without corneal bulge will give you wrong effect of the refraction so not that Physically correct at all , also for best effect you need caustic to be ON .
I know the physical charts but putting it in will just not working exactly with the base model .
More adventure with Cory, he got a mullet hair style ;)
...been doing a lot of experimentation (and rendering)
A WIP using the Sun/Sky with dome and Jack Tomalin's Invetero (with a few additions)
First uses just the base Belle skin shader on the girl with the Freckles overlay
Second uses the same but with the Iray G2F skin shader (applied to not overwrite the original) and skin settings MEC4D specified several pages ago.
nice one .. like the set
the second one looks like more diffused on the skin , the Belle skin is almost ready to go as it does not have as much color over cast
nicely done
More using Soldiers of Magic Serpio in ways it wasn't intended!
Waterbender!
...thank you.
I feel the second one is a bit more "correct" as the character is quite fair skinned.
Still need to work on the hair a bit more and figure out how to deal with the "blurriness" of the ground texture closest to the camera (It already has a bump map applied)
Need to try find an HDRI with a high enough sun angle (roughly about 55° elevation) to see if it would make a difference.
still tweaking this,
testing skin without texture maps just color based SSS
1.38 on most of the lists I've seen...it's really something much more complex, though.
http://www.ncbi.nlm.nih.gov/pubmed/7634138
But how you would handle that with a single thickness model...well, a tri-layered shader (or dual with topcoat).
Now would the three layers be noticeable in a render? Probably not unless it was a pretty tight shot...of course that also assumes a more accurately modeled eye...which would need to include a lens and define interior volumes.
The fluid behind the cornea should be 1.33 IOR (same as water)...it's known as the aqueous humor, and is mostly water.
1.375 is the number I saw. Most round up. In that range, in any case. :) Note that is for Genesis 2 eyes, not Dragon 3 or Genesis 1 as their eyes are constructed differently, but should be pretty good for Mil 4.
That's close to the average of the 3 layers...and reading that NIH paper (at least just the abstract of it) there is a bit of a range on them so something around 1.375 through 1.395 should work for a single layer/value.
Ok here comparison , one of the eye have the settings DAZ_Spooky suggested and one PBR based that including the right specular values and with the fluid behind the cornea known as the aqueous humor
both A and B have the same bump maps and bulge morph with iris morph .. and as reference real eye reflection ..
please note that one of the eye setting does not show the iris right when looking from the side .
so what you think eye A or eye B looks more realistic ?
I think the verdict is clear as one of the eye will not even reflect eyelashes due to low refraction level
Phew, took just over 9 hours to render with no subdivision :ohh: but I am pleased with the final result for this particular character. I played with a lot of the face morphs and changed some of the textures for details on the eyes and mouth. Although not perfect, I am content with the things I have learnt about using Iray, to achieve this level of detail so far.
:-)
Yep, Cath...proper geometry goes a long way to improving eye 'realism', even in 3DL.
I don't have any of the morph packages that include a Corneal Bulge, or Iris Depth or Pupil Dilation morphs...so I just knocked out a set in Blender. And it's improved things dramatically, even in a basic, G2F as she loads materials, no tweaks 3DL render.
Hector
Using the small HDRI that comes in the latest Beta. No other lighting.
...where is that found?
Render Setting|Environment|Environment Map.
Testing another approach using Shader Mixer, I think a need more layers, still a WIP...
It's automatically loaded into the environment map slot when you start a new scene.
...so if you have nothing in the environment map, the Iray HDRI is loaded as a default now.
The little diffuse HDRI map create a nice light actually and shadows , good job John on the render
Iray render thread continued here