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From: Thomas de Groot
Subject: Apparent circular pattern of scratches
Date: 25 Jan 2019 07:21:57
Message: <5c4aff65@news.povray.org>
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See at same subject in povray.advanced-users.
OK. This is the best I can do presently.
--
Thomas
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Attachments:
Download 'circular scratches_test.png' (457 KB)
Preview of image 'circular scratches_test.png'
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From: Thomas de Groot
Subject: Re: Apparent circular pattern of scratches
Date: 25 Jan 2019 07:34:59
Message: <5c4b0273@news.povray.org>
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On 25-1-2019 13:21, Thomas de Groot wrote:
> See at same subject in povray.advanced-users.
>
While increasing the bump_size.
--
Thomas
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Attachments:
Download 'circular scratches_test.png' (719 KB)
Preview of image 'circular scratches_test.png'
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in news:5c4aff65@news.povray.org Thomas de Groot wrote:
> This is the best I can do presently.
>
Comming along nicely.
It still has a bit of 'leathery' quality to it, less metallic. Maybe it's
the size/width of the scratches that give that impression,
ingo
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ingo <ing### [at] tag povrayorg> wrote:
> > This is the best I can do presently.
Which is indeed very nice. :)
> Comming along nicely.
> It still has a bit of 'leathery' quality to it, less metallic. Maybe it's
> the size/width of the scratches that give that impression,
>
> ingo
Yes, I would say that probably the real test would be something like a
transparent piece of plastic or a dark plastic/glass, where there are in reality
a lot of scratches, but optically, only a few of these are ever really visible
at any given time - depending on the viewing angle.
So, sparser, finer scratches, and perhaps an animation where the object is
rotated a bit to see how a changing incident light angle affects the look.
Still, this has developed to a usable form for a lot of scenes in a very short
time. Great work! :)
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Am 25.01.2019 um 19:29 schrieb Bald Eagle:
> ingo <ing### [at] tagpovrayorg> wrote:
>
>>> This is the best I can do presently.
>
> Which is indeed very nice. :)
>
>> Comming along nicely.
>> It still has a bit of 'leathery' quality to it, less metallic. Maybe it's
>> the size/width of the scratches that give that impression,
>>
>> ingo
>
> Yes, I would say that probably the real test would be something like a
> transparent piece of plastic or a dark plastic/glass, where there are in reality
> a lot of scratches, but optically, only a few of these are ever really visible
> at any given time - depending on the viewing angle.
>
> So, sparser, finer scratches, and perhaps an animation where the object is
> rotated a bit to see how a changing incident light angle affects the look.
I think one important feature overlooked so far may be that the
scratches are presumably rough (in all directions, not only in cross
section), while the remainder of the surface is rather smooth; so you'd
either need different finish properties for the scratches (with larger
highlights), or you'd have to somehow add a bit of noise to the scratches.
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On 25-1-2019 19:47, clipka wrote:
> Am 25.01.2019 um 19:29 schrieb Bald Eagle:
>> ingo <ing### [at] tagpovrayorg> wrote:
>>
>>>> This is the best I can do presently.
>>
>>
>>> Comming along nicely.
>>> It still has a bit of 'leathery' quality to it, less metallic. Maybe
>>> it's
>>> the size/width of the scratches that give that impression,
>>>
>>> ingo
>>
>> Yes, I would say that probably the real test would be something like a
>> transparent piece of plastic or a dark plastic/glass, where there are
>> in reality
>> a lot of scratches, but optically, only a few of these are ever really
>> visible
>> at any given time - depending on the viewing angle.
>>
>> So, sparser, finer scratches, and perhaps an animation where the
>> object is
>> rotated a bit to see how a changing incident light angle affects the
>> look.
>
> I think one important feature overlooked so far may be that the
> scratches are presumably rough (in all directions, not only in cross
> section), while the remainder of the surface is rather smooth; so you'd
> either need different finish properties for the scratches (with larger
> highlights), or you'd have to somehow add a bit of noise to the scratches.
Gentlemen, you are perfectly correct regarding these suggestions. We now
enter the domain of subtlety and craftiness indeed. Let's see what we
all come up with.
--
Thomas
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From: Thomas de Groot
Subject: Re: Apparent circular pattern of scratches
Date: 26 Jan 2019 03:56:25
Message: <5c4c20b9@news.povray.org>
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Proof of concept using different finishes for surface and scratches.
Still in flux...
--
Thomas
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Attachments:
Download 'circular scratches_test.png' (506 KB)
Preview of image 'circular scratches_test.png'
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From: Thomas de Groot
Subject: Re: Apparent circular pattern of scratches
Date: 26 Jan 2019 07:10:38
Message: <5c4c4e3e@news.povray.org>
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... and fulling following "The Teachings of Clipka" (Scroll 24F, Chapter
"On Metals and their Finish").
--
Thomas
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Attachments:
Download 'circular scratches_test.png' (519 KB)
Preview of image 'circular scratches_test.png'
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in news:5c4c20b9@news.povray.org Thomas de Groot wrote:
> Proof of concept using different finishes for surface and scratches.
> Still in flux...
>
The scratches are based on the random sticks? If so, try uses extremely
stretched boxes as sticks to get a sharper 'impression'.
Maybe use a gradient 'depth map' texture on the sticks, the scratichg edge
rgb 1 and going to rgb 0 to the other edges. Vary the rgb 1 on the sharp
edge for depth variation.
Render it with orthocam and a light at the camera location.
ingo
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Hello,
here is my attempt, using a layered texture and an imagefile for the scratches
(similar to what Thomas posted here -
http://news.povray.org/povray.advanced-users/message/%3C5c4970bb%40news.povray.org%3E/#%3C5c4970bb%40news.povray.org%3E
).
material {
texture {
pigment {color srgb <0.9284,0.9016,0.8678>}
normal {
average
normal_map {
[1 bump_map {png "scratches"}
bump_size -1
]
[1 bump_map {png "scratches"}
bump_size -1
rotate x*90
]
[1 bump_map {png "scratches"}
bump_size -1
rotate z*90
]
}
accuracy 0.003
}
finish {
ambient 0
diffuse 0.1
specular 1
roughness 0.0003
phong 0.5
phong_size 10
brilliance 3
reflection {0.6, 1 fresnel on metallic}
conserve_energy
}
}
texture {
pigment {color srgbf <0.96,0.965,0.975,0.99/0.8>*0.8}
finish {
ambient 0
diffuse 0.05
reflection {0, 1 fresnel on}
conserve_energy
specular albedo 0.5
roughness 0.001
brilliance 7
}
}
interior {ior 3.64}
scale 1
Reorient_Trans (z, 1)
}
Norbert
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Attachments:
Download 'scratch finish on metallic surfacea.jpg' (684 KB)
Preview of image 'scratch finish on metallic surfacea.jpg'
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