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Using Texture Maps with Specular Roughness

12 REPLIES 12
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Message 1 of 13
sketchguy
13785 Views, 12 Replies

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:

145-image001.jpg

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.

147-arnold-roughness-error.jpg

Any suggestions fully appreciated!

Thx,

-Steve

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12 REPLIES 12
Message 2 of 13
Stephen.Blair
in reply to: sketchguy

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



// Stephen Blair
// Arnold Renderer Support
Message 3 of 13
Anonymous
in reply to: sketchguy

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

Message 4 of 13
sketchguy
in reply to: Stephen.Blair

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!

Message 5 of 13
sketchguy
in reply to: Anonymous

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.

Message 6 of 13
lee_griggs
in reply to: sketchguy

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.

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 7 of 13
Slava_91
in reply to: sketchguy

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

Message 8 of 13
Anonymous
in reply to: sketchguy

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.

Message 9 of 13
koostic.moloco
in reply to: sketchguy

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

4153-снимок-экрана-2019-07-12-в-95703.png


Message 10 of 13
lee_griggs
in reply to: sketchguy

Have you updated your plugin?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 11 of 13
koostic.moloco
in reply to: lee_griggs

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

Message 12 of 13
koostic.moloco
in reply to: lee_griggs

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

4154-снимок-экрана-2019-07-12-в-101131.png

Message 13 of 13
koostic.moloco
in reply to: lee_griggs

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

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