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Steve Talkowski avatar image
Steve Talkowski asked ·

Using Texture Maps with Specular Roughness

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

arnold5shaders
image001.jpg (98.0 KiB)
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I tried with a few random textures and they all affected the specular roughness in my test scene.

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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!

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

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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.

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

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Lee Griggs avatar image
Lee Griggs answered ·

Have you updated your plugin?

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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

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

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

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Lee Griggs avatar image
Lee Griggs answered ·

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.

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KONSTANTIN KRESTYANNIKOV avatar image
KONSTANTIN KRESTYANNIKOV answered ·

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



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Eleanor Dupont avatar image
Eleanor Dupont answered ·

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.

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