Using Texture Maps with Specular Roughness

[sketchguy]

Hello!, I'm wanting to use grunge/scratch/fingerprint texture maps to break up the Specular Roughness in the aiStandard Shader, similar to this:

I’ve been doing some tests, but not getting the expected results. The texture map i’m using is a 16 bit Grayscale image. I also converted it to an RGB image and connected the R channel to the Specular Roughness, but still not getting the expected results. Is there something obvious i’m missing?

First image is basic shader with some Roughness dialed in:

Second image is with the R channel of the texture map assigned to Specular Roughness. I'm not getting the desired results.

Any suggestions fully appreciated!

Thx,

-Steve

[Stephen.Blair]

I tried with a few random textures and they all affected the specular roughness in my test scene.

[Anonymous]

Have you set the Roughness map to Linear instead of sRGB?

[sketchguy]

Hey Stephen, could you kindly post a screen shot of your Hypershade window with the aiStandardSurface shader selected, along with an image? I'd love to see what i'm not doing correctly. Thx!

[sketchguy]

Hey Dade, I can't seem to access The Color Space section in Image Attributes in the aiImage node when it's connected. When I delete the connection, I see four different Linear options - selecting each one, reconnecting and rendering doesn't seem to change anything that much at all.

[lee_griggs]

Hi Steve, have you tried adding a remap or Range shader in between the texture and the Standard Surface.

I did a recent test here.

[Slava_91]

Hi Steve!
Tried to connect luminance node on and graph network

[Anonymous]

I find that I need to put the Spec Roughness texture in the R channel of the texture file, with pure black in the Blue and Green channels. Then when I connect the spec rough map up via the r channel it works fine.

[koostic.moloco]

I dont have a bunch of settings in aiRange. Like Contrast Pivot and others... Nedd help.

[lee_griggs]

Have you updated your plugin?

[koostic.moloco]

I use Maya 2018. How can i update plugin? where? sorry, i am new in Maya, just study. I would be very grateful for the details

[koostic.moloco]

I use these. Will try to update. Thanks a lot

[koostic.moloco]

You are you a wizard. Thanks a lot. Updated it. Works nice.!