POV-Ray : Newsgroups : povray.object-collection : noisy rendering of a polynomial "cube" Server Time: 19 Dec 2018 11:37:40 GMT
  noisy rendering of a polynomial "cube" (Message 1 to 9 of 9)  
From: Lars R 
Subject: noisy rendering of a polynomial "cube"
Date: 31 Mar 2014 13:16:43
Message: <53396abb$1@news.povray.org>
Problem: The object looks noisy, even with "sturm" enabled. :-(

How can I get a smooth rendering? Is it possible for "poly" objects to
enforce some "precomputing" or the like?

I rendered with

  -ibutterfly.pov +d +v -p +w800 +h600 +sp8 +ep8 +a0.1 +am2 +r3

it took 3½ minutes, with -a it took 27 seconds but looks very ugly due
to the noises. :-(


Lars R.


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From: FractRacer
Subject: Re: noisy rendering of a polynomial "cube"
Date: 31 Mar 2014 15:17:06
Message: <533986f2$1@news.povray.org>
Le 31/03/2014 15:16, Lars R. a écrit :
> Problem: The object looks noisy, even with "sturm" enabled. :-(
>
> How can I get a smooth rendering? Is it possible for "poly" objects to
> enforce some "precomputing" or the like?
>
> I rendered with
>
>    -ibutterfly.pov +d +v -p +w800 +h600 +sp8 +ep8 +a0.1 +am2 +r3
>
> it took 3½ minutes, with -a it took 27 seconds but looks very ugly due
> to the noises. :-(
>
>
> Lars R.
>
  The noisy look is a combined effect of the filtered color of the 
object and the checkered plane which is reflected on and in the object. 
If you want no noisy effect here, you have to set filter to 0 or change 
the pattern of the plane.

Lionel.

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From: FractRacer
Subject: Re: noisy rendering of a polynomial "cube"
Date: 31 Mar 2014 15:33:22
Message: <53398ac2$1@news.povray.org>
Le 31/03/2014 17:17, FractRacer a écrit :
>   The noisy look is a combined effect of the filtered color of the
> object and the checkered plane which is reflected on and in the object.
> If you want no noisy effect here, you have to set filter to 0 or change
> the pattern of the plane.
>

I have said some stupidity, the checkered plane is not in cause, only 
the filtered color cause the noisy effect. Maybe it is a side-effect of 
the polynomial object, since the noise is not present with a box.

Lionel.

-- 
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From: Lars R 
Subject: Re: noisy rendering of a polynomial "cube"
Date: 1 Apr 2014 08:23:00
Message: <533a7764$1@news.povray.org>
>> The noisy look is a combined effect of the filtered color of the 
>> object and the checkered plane which is reflected on and in the 
>> object. If you want no noisy effect here, you have to set filter to
>> 0 or change the pattern of the plane.
> 
> I have said some stupidity, the checkered plane is not in cause,
> only the filtered color cause the noisy effect. Maybe it is a
> side-effect of the polynomial object, since the noise is not present
> with a box.

I know. But how can I fix that? (No, replacing the poly with a box is
not an option. ;-))

L.


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From: FractRacer
Subject: Re: noisy rendering of a polynomial "cube"
Date: 1 Apr 2014 09:25:32
Message: <533a860c$1@news.povray.org>
Le 01/04/2014 10:23, Lars R. a écrit :
>>> The noisy look is a combined effect of the filtered color of the
>>> object and the checkered plane which is reflected on and in the
>>> object. If you want no noisy effect here, you have to set filter to
>>> 0 or change the pattern of the plane.
>>
>> I have said some stupidity, the checkered plane is not in cause,
>> only the filtered color cause the noisy effect. Maybe it is a
>> side-effect of the polynomial object, since the noise is not present
>> with a box.
>
> I know. But how can I fix that? (No, replacing the poly with a box is
> not an option. ;-))
>
> L.
>
>
If you don't need transparent object, you just have to change the color 
like this:

pigment { color rgb <1,0.7,0.2> }
and remove the interior statement.

Lionel.
-- 
Do not judge my words, judge my actions.

---
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From: Lars R 
Subject: Re: noisy rendering of a polynomial "cube"
Date: 1 Apr 2014 11:19:56
Message: <533aa0dc$1@news.povray.org>
> [â¦]
> If you don't need transparent object

I need it, hence I made it semi-transparent and refractive. I like the
"gummi bear look".

Lars R.


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From: FractRacer
Subject: Re: noisy rendering of a polynomial "cube"
Date: 1 Apr 2014 19:32:39
Message: <533b1457@news.povray.org>
Le 01/04/2014 13:19, Lars R. a écrit :
>> [â¦]
>> If you don't need transparent object
>
> I need it, hence I made it semi-transparent and refractive. I like the
> "gummi bear look".
>
> Lars R.
>
I don't know why but, after some tries, it seems that only the 
polynomial and poly objects are affected by this noise with filtered 
colors.
We need developper's help here, I can't explain more, sorry.

Lionel :(
-- 
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From: FractRacer
Subject: Re: noisy rendering of a polynomial "cube"
Date: 3 Apr 2014 13:58:20
Message: <533d68fc$1@news.povray.org>
Le 01/04/2014 21:32, FractRacer a écrit :
> Le 01/04/2014 13:19, Lars R. a écrit :
>>> [â¦]
>>> If you don't need transparent object
>>
>> I need it, hence I made it semi-transparent and refractive. I like the
>> "gummi bear look".
>>
>> Lars R.
>>
> I don't know why but, after some tries, it seems that only the
> polynomial and poly objects are affected by this noise with filtered
> colors.
> We need developper's help here, I can't explain more, sorry.
>
> Lionel :(

See the post /noise with polynomial object/ in p.bugreports.

Lionel.

-- 
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From: Cousin Ricky
Subject: Re: noisy rendering of a polynomial "cube"
Date: 7 May 2014 00:25:01
Message: <web.53697b96a6b2aa33192ae5f10@news.povray.org>
"Lars R." <rou### [at] gmxnet> wrote:
> Problem: The object looks noisy, even with "sturm" enabled. :-(
>
> How can I get a smooth rendering? Is it possible for "poly" objects to
> enforce some "precomputing" or the like?
>
> I rendered with
>
>   -ibutterfly.pov +d +v -p +w800 +h600 +sp8 +ep8 +a0.1 +am2 +r3
>
> it took 3½ minutes, with -a it took 27 seconds but looks very ugly due
> to the noises. :-(

I converted it to an isosurface.  It takes 80% more time, but at least it's
smooth.
________________________________________________

isosurface
{ function
  {   pow (x, 6) + pow (y, 6) + pow (z, 6)
    - 3 * (pow (x, 4) + pow (y, 4) + pow (z, 4))
  }
  max_gradient 115
  contained_by { box { -2, 2 } }

  pigment { color rgbf<1,0.7,0.2,0.5> }
//  normal { granite 0.1 }
  finish { phong 0.6 }
  interior { ior 1.5 }
}
________________________________________________


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