I can't re-shade a texture and I don't know why

Blind Owl

Here's a render of the '58 Chevy Impala I bought from Renderosity. I've successfully applied iRay shaders to every surface except the backs of the front seats. I've played with every setting I can think of, but I can't get rid of that mottled gray effect. I'm sure it's something simple and stupid, and hoping to find out what.

Rather than ask the question at Rendo, I thought I'd post it here, where the iRay aces hang out. 

fastbike1

It would help if we knew what you expected the texture to be.

My first thought was that the tiling needs to be changed.

Blind Owl

fastbike1 said:

It would help if we knew what you expected the texture to be.

I guess it would at that.  

Here are before-and-after renders of the car. As you can see, all the interior surfaces except the seat backs look iRay-normal. I've played with the tiling, bump, refraction, you-name-it settings but I can't get rid of those dark grey blotches. It doesn't matter which shader I try, they're still there.

I suppose the easiest and most obvious solution is to simply avoid showing them in renders, but I would like to know why they're so stubborn.

kitakoredaz

I think the product vendor  adjust UV tiles counts for default shader which used for.  

it will not set correctly for daz uber iray.  try change uv tiles counts in geometry/tiling  section, Vertical and Horizontial. to get more large count tiling.

but to be frankly said,, you may better remove  texture which used for the surface where you modify,  then apply another one.

I think, the product not use many texture, then you can make as you like, with bump, glossy, alberto map, just plug in with default uber iray shader. then play with parameter. You may grab simple PBR work flow

I often pick up those.  (though it depend on how vendor offer their uv map,, but for most of clean UV set,, it should work well with your UV tile setting.)

https://www.textures.com/download/substance0022/126941

Richard Haseltine

That looks a bit like two coincident layers of geometry

Blind Owl

Richard Haseltine said:

That looks a bit like two coincident layers of geometry

I hadn't thought to check that. I'm off to investigate.