G3F iris problem

Sertorial

Can anyone explain the white ring around the iris? Seems to happen with any iris diffuse map. More importantly, how do I fix it!

Thanks

BeeMKay

In the shaping tab, look for the iris correction dial.

Sertorial

BeeMKay said:

In the shaping tab, look for the iris correction dial.

thanks. tried that already. Doesn't fix the problem when dialled in either direction :-(

mjc1016

Is that image a render?

If so, check for a displacement map on either the iris or sclera...unless SubD levels are increased, for Iray, displacement maps will move too much of the mesh and 'override' the adjustment morph (too much large scale movement for the morph limits).

Sertorial

mjc1016 said:

Is that image a render?

If so, check for a displacement map on either the iris or sclera...unless SubD levels are increased, for Iray, displacement maps will move too much of the mesh and 'override' the adjustment morph (too much large scale movement for the morph limits).

hi. yes, it's a render.

I checked, there is no DISP map on either the iris or the sclera

mjc1016

Which character is this?  If her eyes were enlarged, the limits on the correction morph could now be too low...

Sertorial

mjc1016 said:

Which character is this?  If her eyes were enlarged, the limits on the correction morph could now be too low...

it is Chiyo HD for G3F (by Raiya).

I did try switching off limits on the parameters of the iris correction morph, but at extreme values (e.g. 500% it seems to move the iris inside the skull - which looks extremely odd).

I have never seen these white rings around an iris before. Do you know what causes it?

And what is the iris correction morph actually doing?

mjc1016

The iris isn't attached to the eyeball...the correction morph is moving it in/out a little to keep it from intersecting/poking out/creating a visible gap with the eyeball.

Here is the correction morph at zero:

A -100%

At 100%

 

And at -7.1%

Now other eye morphs and size changes, especially changing the size of the iris will affect how much correction will be needed.

Sertorial

Thanks. That's helpful. Maybe I had increased the size of the eyes (I need to check that).

But it would surely help to avoid this problem altogether if the iris map went right to the edge of the iris disc! I am not sure why there needs to be a bit of white space around the edge. It's just asking for trouble! ("I know, let's introduce a problem that we then need to add a correction morph to fix"

Sertorial

Nope. It wasn't the size of the eyes either. No amount of morph fiddling fixed this, so eventually I decided to edit the iris diffuse map to bleed the brown to the edge of the iris (God knows why the PA didn't do this!)

Admittedly, there is now a slight black ring there for some reason, but it's certainly preferable to white!