Hotspots (white) in textures converted to Iray

RenderPretender

I have been working on a project with Blackhearted's GND4.2. I am using the original textures for skin and clothing that were intended for Poser's Firefly and DAZ 3Delight, but have converted the textures to Iray. Things are looking quite good in Iray at the moment, but I have noticed a tendency for the converted textures to show "hotspots" (I think different from fireflies) on areas that would normally catch a lot of light, such as elevated areas of hair and clothing, and skin prominences. Is there a particular Iray setting for the textures that I can use to surgically target these annoyances, rather than boosting the Firefly filter, increasing light, fooling with tone mapping, or other such global techniques?

Thank you!

3Diva

If you're seeing white spots on elevated areas that sounds to me that the surfaces might have the gloss up to high perhaps. You might go into the surfaces settings and check to see if lowering the glossiness settings would help (you can try adjusting any of the settings that says "Glossy" or "Top Coat" as well as any "Duel Lobe Specular" settings). 

You can also check the Render Settings tab and look under Tone Mapping to make sure that "Burn Highlights" isn't turned up too high.

richardandtracy

Possibly increase the glossy roughness too. Found that I needed to with V3 clothing in this image https://www.daz3d.com/forums/uploads/FileUpload/08/20c66fa575e224521ab59aaafbdee4.png rendered in iRay, the figure on the left (the other 2 are G8F). Found that dialling up the bump map didn't work very well, but using the bump map as a displacement map worked fairly well at breaking up highlights too.

Regards,

Richard.

 

Hiro Protagonist

The trouble usually lies under "Glossy Layered Weight". Here are the converted settings for an old DAZ/Poser format item. First I set Glossy Layered Weight to the default 1.0 which gives more scope for the related parameters (0.19 is a very odd setting), but the real culprit is Glossy Roughness being set to 0.0149897, which is bonkers. Set this to a minimum 0.25, although I'd usually set it to beween 0.5 and 0.8. There is also an unnatural Glossy Color, which I would change to a greyscale colour initially, but you can set that to your taste.

In this same conversion, the bump is 0.12, which is in effect nothing, so I set that to something reasonable, depending on the strenght of the texture.

"Dual Lobe Specular" will be ignored, so it won't be that and I don't recall seeing Top Coat settings being filled in, but I guess it's worth checking.

RenderPretender

Thanks to all for the response. I'd like to alter as few variables as possible to avoid getting into trouble, so I'll experiment with them one at a time.

RenderPretender

Hiro Protagonist said:

The trouble usually lies under "Glossy Layered Weight". Here are the converted settings for an old DAZ/Poser format item. First I set Glossy Layered Weight to the default 1.0 which gives more scope for the related parameters (0.19 is a very odd setting), but the real culprit is Glossy Roughness being set to 0.0149897, which is bonkers. Set this to a minimum 0.25, although I'd usually set it to beween 0.5 and 0.8. There is also an unnatural Glossy Color, which I would change to a greyscale colour initially, but you can set that to your taste.

In this same conversion, the bump is 0.12, which is in effect nothing, so I set that to something reasonable, depending on the strenght of the texture.

"Dual Lobe Specular" will be ignored, so it won't be that and I don't recall seeing Top Coat settings being filled in, but I guess it's worth checking.

BAM! Glossy roughness was indeed the culprit. A setting of 0.5 imparts some of the healthiest looking skin (not shiny or oily, but rich and deep) I have seen on any model from any generation. I'll have to try that with any other problem spots. Thanks to Hiro and to all.