This is the problem with not having access to DS4.5 I had no idea they brought back the Cornea surface for Genesis…I just had it confirmed.
For me this is good news but how to set it up better.
The first thing to do is turn OFF the Specular “Multiply Through Opacity” setting, What does this do?
With Multiply Through Opacity turned OFF lets the render engine know that there is a transparent object/surface in the scene the will need specular highlights and Reflections. This is also true for Glass. If you using low opacity and high reflections and specular highlights for any surface/s and not using opacity maps turning this OFF will help achieve those results. If you are using a Opacity map then this needs to be ON otherwise you will get reflections and/or highlights on parts that should be invisible.
Opacity between 40 and 50% works quite well if you are using a reflection map.
If using a reflection map then place the reflection map (usually a black and white map) in the Diffuse Colour and Opacity channels still turning OFF Multiply Through Opacity in the Specular channel
If you are not using a reflection map and want crisper looking eyes try 0% opacity and as long as your light set up is good enough and you turn OFF Multiply Through Opacity you should get good reflections. I am doing an animal image at the moment and even at 0% Opacity I am getting nice reflections on the cornea.
Reflection colour 255,255,255 white
Reflection Strength (for real reflections we do need something in the scene to reflect) 100% or lower to taste. If using a reflection map then 0% will be best.
Ok hope that helps with the Cornea surface.
Oh yeah if you want help with the other parts like with SSS for the whites etc just yell. I am still here to help but with having to wait to get to use the laptop makes it hard to get online much these days.