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flukve
Post  Post subject: Anisotropic artifacts  |  Posted: Tue Jan 10, 2017 1:54 pm

Joined: Fri May 15, 2015 11:35 am
Posts: 54

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Hi!

See attached image, I want a nice rotated brushed metal top on this object, but i get
this look.

1. The top geometry is 100% flat.
2. I have tried both radial ramp and a texture (png/tga) as input for the anisotropic rotation.
3. I have tried many different settings for roughness and anisotropy.
4. I have tried both soft and hard normals on the geometry.
5. The UV mapping is flat from the top above, not broken, and there is only on UV set.
6. I am using specular indirect feature.
7. The reflections come from an area light, a white ambient plane, and a HDRI.
8. I have tested making new shaders and even new geomery but i get the same result.
9. It also happens with regular roughness, when anisotropic is turned off.
10. It also happens when using reflections instead of indirect specular.
11. Restarting maya does not help. Scene and object size is normal.

I have not seen this before, perhaps i have touched some global setting or maybe something
happened in the latest release?

Thanks.

(this post did not seem to come up so i am re-posting it, sorry if it becomes a double post)


Attachments:
anisotropic_001.png
anisotropic_001.png [ 599.51 KiB | Viewed 5784 times ]
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Jan_Tomanek
Post  Post subject: Re: Anisotropic artifacts  |  Posted: Wed Jan 11, 2017 8:57 am
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Joined: Tue Oct 27, 2009 11:03 pm
Posts: 1606
Location: Prague - Czech republic

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Could you send us the object?
And also can you post wireframe here? It looks that there are triangles geometry on those artefact, or not?

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flukve
Post  Post subject: Re: Anisotropic artifacts  |  Posted: Tue Feb 07, 2017 12:54 pm

Joined: Fri May 15, 2015 11:35 am
Posts: 54

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Hi,

sorry for the late reply, i have been busy with this project but
now it is nearing its end and i have to find solutions to these
problems.

So, I finally found the problem after -many many- hours of
testing. It happens when there is a HDRI Dome map in the
scene, and specifically, when "cast shadows" is unchecked.

As i have found more issues with anisotropic shading, see
attached and image that explain them clearer.

To answer your question, yes it is the object wireframe you see
in the artifacts, and as it happens on ALL objects i do not see
the need to upload this specific object. HDRI shadows off is
what causes this error.

# ISSUE 1: I am guessing this is a bug, but, It can be fixed by
turning on the dome light shadows, but i do not want shadows
from this source in this scene.

# ISSUE 2: Setting the dome light to hybrid mode creates
another type of artifact, dark squares, i have not researched
how to get rid of this yet as i have already spent hours on
ISSUE 1 and 3. I am guessing though, that this error has to do
with post effects, but could also be something else entirely.

# ISSUE 3: I have tried creating the anisotropic rotation
texture in so many different ways, how can i get a clean
anisotropic result? I do not want to use ramps. In mental ray
this same texture will create a clean result. To be clear,
i am not suggesting that issue 3 is a bug, i just want to know
how to make this look good?


Thanks!


Attachments:
anisotropic_004.png
anisotropic_004.png [ 678.79 KiB | Viewed 5746 times ]
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flukve
Post  Post subject: Re: Anisotropic artifacts  |  Posted: Tue Feb 21, 2017 1:43 pm

Joined: Fri May 15, 2015 11:35 am
Posts: 54

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Hi,

if you have the possibility, if you could first only answer how i can
make an anisotropic rotation map that not has got a sharp beginning
and end to it (ISSUE 3). I would be very grateful.


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flukve
Post  Post subject: Re: Anisotropic artifacts  |  Posted: Thu Feb 23, 2017 11:10 am

Joined: Fri May 15, 2015 11:35 am
Posts: 54

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# ISSUE 3, SOLVED

The intensity in the rotation texture was slightly off, so the blend between the 360 to 0
rotation was instead 350 to 10 degrees or so, hence the gap in the anisotropic reflection.


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Jan_Tomanek
Post  Post subject: Re: Anisotropic artifacts  |  Posted: Thu Feb 23, 2017 11:13 am
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Joined: Tue Oct 27, 2009 11:03 pm
Posts: 1606
Location: Prague - Czech republic

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We will look into it.
But I'm not sure you problem with map - your map HAS hard edge in the middle, so you have it also in render...

I looked on internet and correct anisotropic map HAS NO edges:
http://wiki.unity3d.com/images/thumb/c/ ... ction2.jpg

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flukve
Post  Post subject: Re: Anisotropic artifacts  |  Posted: Thu Feb 23, 2017 12:24 pm

Joined: Fri May 15, 2015 11:35 am
Posts: 54

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Sweet, it works with a normal map too, i did not know that, many thanks! :)

Well, it does work with that greyscale map now once when i made the white
pure white 255,255,255 and pure black 0,0,0.

See attached image for the perfect anisotropic reflection with greyscale map,
but from here on i will use normal map anyway.


Attachments:
anisotropic_005.png
anisotropic_005.png [ 53.92 KiB | Viewed 5660 times ]
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Jan_Tomanek
Post  Post subject: Re: Anisotropic artifacts  |  Posted: Thu Feb 23, 2017 3:49 pm
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Joined: Tue Oct 27, 2009 11:03 pm
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Location: Prague - Czech republic

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Great - it looks nice. Would you like to share you image with us over our Credit system?

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flukve
Post  Post subject: Re: Anisotropic artifacts  |  Posted: Tue Feb 28, 2017 7:44 pm

Joined: Fri May 15, 2015 11:35 am
Posts: 54

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Hi Jan,

the project is commercial and has not yet been released but i can upload it
to your credit system once the graphics is out and official.

If you find and fix the anisotropic issue 1 and 2 bugs i get some credit for
that right?


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