(Solved) Skin Issue - Lolita

MistaD2047

I'm not sure what to do but I noticed this in one of my last renders.

Specifically around the shoulders of the arms.  The skin is Lolita and it's base, I didn't add anything to it and I can't quite take it away with postwork with my minimal skill on that end.

Check the image below.  I also included the .duf file if that helps.

scorpio

It looks like a problem with the seam - are you rendering in 3dl or Iray and are the mats designed for 3dl or iray

Richard Haseltine

This lolita http://www.daz3d.com/lolita-for-aiko-7 ? I don't have that, but the first thing to check is the gamma values on the maps - in the Surfaces pane click the mini-thumbnail to the left of the colour chip/strength slider for each property on the torso and limb maps, then Image Editor, and look at the value for Gamma - if you find one that doesn't match between the two surfaces that's probably your culprit, and it should be reproted as a bug.

MistaD2047

scorpio said:

It looks like a problem with the seam - are you rendering in 3dl or Iray and are the mats designed for 3dl or iray

It's rendered in iray at about 2500-3000 iterations and the mat is the iray version

MistaD2047

Richard Haseltine said:

This lolita http://www.daz3d.com/lolita-for-aiko-7 ? I don't have that, but the first thing to check is the gamma values on the maps - in the Surfaces pane click the mini-thumbnail to the left of the colour chip/strength slider for each property on the torso and limb maps, then Image Editor, and look at the value for Gamma - if you find one that doesn't match between the two surfaces that's probably your culprit, and it should be reproted as a bug.

I'm not sure if this is the issue but when I open the image in photoshop it looks like where the end of the edge is they've outlined it in a different shade.  And yeah it is that lolita htat you linked

Richard Haseltine

The outline probably isn't the issue - typically there will be an overlap of the correct colour anyway (so that if the image is downsampled it won't get a seam from blending in the background colour so the other colour is probably even further out.

MistaD2047

yeah it looks like that outline that was done is the culprit.  I did a quick render of another skin adn checked it's map and it rendered fine and the mat had no outline.  Not sure why the original creator ozichick decided to do the outline tho or why it wasn't caught by daz before it became a Daz Original.

jestmart

Are you sure you don't have specular or bump maps from another texture set?.  Thoses line don't look like typical seam problem but more like they are from one of the many 'cyborg' texture sets.

MistaD2047

checked.  they're all lolita and it's not just the arms but the legs too. I did a render with just underwear and yeah the same seam issue is on the legs too.  Attached is a snippet from 2 Aiko7 Skins I have.  Lolita for Aiko7 on left and Natsuko for Aiko7 on Right.  These are both from the arm part of the texture map and the area that connects to the torso.  The legs also have the same outline as on the arm.

I suppose I could clone brush the parts on the lolita skin to get rid of that horrible outline.  (I even deleted and re-downloaded the skin)/  Even the torse has that outline.   Then again it could be the torso texture (or a combination) itself that's screwy since it also has similar outlines as below.   

nicstt

A very common culprit, as Richard has suggested you check, is the Gamma; i've not got any issues when I looked, I've also changed the shader values which often highlights issues that the default does not. I'm not seeing anything; third image.

The top value shows as zero (in the first image); the usual error is it being 1 when the other settings are zero. This is not always the case so compare all textures on both arms and torso. You need to check for each texture; SSS and Spec are common culprits, with the Normal maps sometimes being a problem but for a different reason. I'm certainly not getting any blead of the edges.

Have you edited the textures in any way?

Have you set the UVs to be other than what they should be? Select skin, make sure that default female is displayed in UVs; second image.)

MistaD2047

nicstt said:

A very common culprit, as Richard has suggested you check, is the Gamma; i've not got any issues when I looked, I've also changed the shader values which often highlights issues that the default does not. I'm not seeing anything; third image.

The top value shows as zero (in the first image); the usual error is it being 1 when the other settings are zero. This is not always the case so compare all textures on both arms and torso. You need to check for each texture; SSS and Spec are common culprits, with the Normal maps sometimes being a problem but for a different reason. I'm certainly not getting any blead of the edges.

Have you edited the textures in any way?

Have you set the UVs to be other than what they should be? Select skin, make sure that default female is displayed in UVs; second image.)

I haven't edited the images in any way. I was sure I checked the gamma's and I completely reloaded and even redownloaded the texture. UV Sets were set to base afaik (unless they were initially set differently on release).  I'll check it out later tonight when I get home.  All the texture maps were of the correct texture with spec or bump variations in the appropriate sections.

thanks.

MistaD2047

I don't get it.  I checked all the gamma's and the character is set to base female (even tried V7 and A7 and A7 made it way worse) all the gamma's were fine, there was no LIE's on.  I even created a new scene.

ahah!!

After a few experiments I discovered that it was something with the render settings.  Apparently when I had spectral rendering on (set to either natural or faithful (cie1964 or cie1931) it caused the seaming.  So with that I tested a few more skins and it's happening in all of them.  When I switch between faithful and natural it's still noticiable but low on other skins and high on lolita (maybe it is a weird outline issue on that end).

So it wasn't gamma or anything with sliders it was a render setting that's screwy (spectral rendering)

Sorry about all that guys.  But I figured it out.

nicstt

Good it's sorted.

Might be worth querying if that is considered a bug; raise a ticket.

Tobor

Spectral rendering does change gamma characteristics, so it's not unheard of to require some adjustment, either for the entire image as a gamma setting, or more likely in the specific shaders.  Spectral rendering is typically used for things like evaluating the behavior of light against specific types of materials (more common in commercial or industrial settings), but I rather think it has less application for artistic reproduction of human skin. Some renderers, like Lux Render, are inherently spectral, but then any surface definitions are based on that model from the start, so the effort to achieve photorealistic resilts is already built into the materials definitions.