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Eric Turcotte avatar image
Eric Turcotte asked ·

Arnold Opacity Map - Blue and Yellow Visual Glitch

Heya, so I have an odd problem that I can't seem to fix. On all the "grass" textures, in this render, there is a light shade of either yellow or blue. Itts very subtle, but on closer inspection, one can see it, its bugging me lol. I used an Opacity map to subtract empty space from the grass, otherwise it would be a flat plane.
My problem is that no matter what I do to try and fix the issue, the blue and yellow glitch isn't going away. Is there something i'm just overlooking?
The opacity map is working in the maya viewport, just not in arnold


arnoldmtoa
agh.jpg (1.9 MiB)
hm.jpg (590.6 KiB)
testtt.jpg (221.8 KiB)
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Lee Griggs avatar image
Lee Griggs answered ·

The opacity PNG was grayscale. There is a ticket for this bug.

Changing the PNG to RGB is a workaround.


1574942127578.png (114.2 KiB)
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Eric Turcotte avatar image Eric Turcotte ·

Do you mean change the .png ? I followed what you did in the picture by adding "_rgb" just before the .png
On my main scene, it appears the blue and yellow bug are still there, but it seems reduced.

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testttt.jpg (623.3 KiB)
Lee Griggs avatar image Lee Griggs Eric Turcotte ·

Change the Mode in Photoshop to RGB :)

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1575010455891.png (9.3 KiB)
Eric Turcotte avatar image Eric Turcotte Lee Griggs ·

It works! This workaround works :D I can confirm. Thank you Lee Grigs, btw love your work haha

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Lee Griggs avatar image
Lee Griggs answered ·
  1. Is there any color in the opacity map?
  2. Are you using transmission as well?
  3. What is causing the color here?
  4. Can you provide a simplified scene with a plane and textures that cause the issue?

1574928863094.png (16.8 KiB)
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Eric Turcotte avatar image Eric Turcotte ·

1.) No there is no color, here is my Opacity map

2.) I'm not using transmission since it didnt seem to make a difference, when i up the value, the colors get darker till it then poofs and disappears.
Should I be using transmission?

3.)Whats causing the color is the palette of textures im using for my scene, ill provide a screenshot

4.) Sure. Here yah go

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Lee Griggs avatar image
Lee Griggs answered ·

Yes, don't use transmission. Do you have the simplified scene available?

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