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Author Topic: noise problem ?  (Read 3038 times)
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fractales75
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Posts: 22


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« on: October 11, 2013, 11:51:58 AM »


I made a picture (from  MarkJayBee parameters but highly modified)
 that I can not complete: there is a lot of noise, and I can not remove it.
I searched, maybee not on the right place, and I have not found what is wrong.
I have not enough experience...
I searched  in tutorials, and I still have not found what could 'cure' my image
can someone look at the parameters?
and tell me what's wrong?

&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

Mandelbulb3Dv18{
g....EJ/....1...w....2M...U1tJs363CuzGykdcqyfF4ErDXdCq75C.In/aS9.TyrzAJdrEmM1Wuj
................................Gp4FyTu6I.2........Y.hy8.......E.......UK/2...wD
...Uz6/....n0....Mk./...........X1...2E4.....EwbqnqXSFnD/.kRsTyDebkG.dkpXg1.nAnA
z6....kD12../..........wz................................cU0.....y1...sD...../..
.w1...sDtJKGIvyRzuvL0EHQmzj4zy9N4kgNzzmj.st.hKFLlwflaDH3n71jyS4QmI2I4QgDQoXtGm5w
3v9jGoozmxz9zYqC1AscyfljU....3oi9.........UaNalD.U....sD..G...........zD........
kz1..........rAnAt1...sD....zMKSslo1niwwPpS/5ROqkFbaROsk91........EGX72Ew....k1.
.....Ksulz1.......kz.Iwl31E5.I../0...U2....D....j0...U4...U8....4/...UHB...UJr5I
1./U.41P17wcHRIlclra2D3ECNA60c..qO5I..klrlkCx9zj6s41pmERLz9..........Ek.IwjUY72.
.g0JDYiN9.2.7hYxqz5sz.EFpzsIi1wDU.V1.wmFD/..sKtn7mv/.v/STeucQJ.k..........E7GMYz
I4fJ..E4yVUM04/E.G.at0ZYHz1.u.CzGUYpzEU.Iwjdg43..sTc3eOd7.28kRrRJOqsz.UPMNbaAnxD
2Ik3zvsHY...IuC52512./UJqCEKICtD.6ifRMSXjx1..wsff0EzxrDcUB0Pe7..xrTzUee8Smvi.oTz
x1OuU/8cU0EzxrDcNsLT/88.xrTzUydTU08c..8cU0upy/8cU0.cU08cKw5cU08.U08cU4pTU08c..8c
U0eqz/8cU0.cU08c...cU08czz/cU08cyz1cU08cxz3cU08c.Y4RtpmPap0RcJK9aJ5Rp7LNhU2FhQLM
E....AU.V2U.....I....k....kIdJaQkVIOg7KNmF5...............................U/4MU/
4M........UNaNaNaN4../........zD........kz1........wz...........................
...............................................E........kz1.....................
.....................2.....3....A....AJOZ75Q6Z4PWJaQo/..........................
.....MU/4MU/4................UzD........kz1........wz.........zD................
..........................................................2........wz...........
................................/....E/...E.....T7LNXZ4QmxqMVl4Km...............
................................OaNaNaNa7z1.............................kz1.....
................................................................................
.......Fractales75....................}
{Titel: gotham_city}

&&&&&&&&&&&&&&&&&&&&&&&&

thanks !


philippe
 smiley

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cKleinhuis
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« Reply #1 on: October 11, 2013, 01:10:20 PM »

i played around with the settings, hmm, damn hard scene, the higher you set the DE Stop value the fewer details the image has, but it is the small things
that clutter up the pic,

i then tried using absurdly small de stop values like 0.01 this removes just some of the cluttering, so, perhaps you really need to render it at a real high resolution with real small de stop values, and then scale it down sad

i read the descriptions in the formulas, you are using a "reciprocalx2" formula, in the description (on the i button beside the name) it is hinting
that the formula might introduce noise, hmm, it seems to be a drawback of that formula
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divide and conquer - iterate and rule - chaos is No random!
lenord
Fractal Bachius
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Posts: 611


No Matter where you go there you are


« Reply #2 on: October 11, 2013, 04:26:53 PM »

The noise I am seeing is positional light artifacts, light scattering, this happens when you bury positional lights. You have to play with intensity and specularity a lot to get it right, or use mapping or Global lights or bring the positional lights out front. A full on white specular object color is a contributing factor too, dull it down and cut the amount. Of course the larger the Render, the lower the SWL and RSM will negate noise too. It's really not that noisy a Parameter, there's a lot that are worse than this, most of the noise here can be fixed with Lighting and gradient adjustments IMO.

Just some quick lighting adjustments, intensity and spec mostly.

Mandelbulb3Dv18{
g.....c....O/...w....2E...U1tJs363CuzGykdcqyfF4ErDXdCq75C.In/aS9.TyrzAJdrEmM1Wuj
................................Gp4FyTu6I.2........Y.hy8.......E.......UK/2...wD
...Uz6/...UL..../M.1/.....U.....W1...2E4.....oknqa.loKoD/.kRsTyDCXcjzckpXg1.Hc0e
y6EnAnQD12../..........wz................................cU0.....y1...sD...../..
.w1...kDtJKGIvyRzuvL0EHQmzj4zy9N4kgNzzmj.st.hKFLlwflaDH3n71jyS4QmI2I4QgDQoXtGm5w
3v9jGoozmxz9zYqC1AscyfljU....32b5.........UaNalD.U....sD..G...........zD........
kz1..........rAnAt1...sD....zMKSslo1niwwPpS/5ROqkFbaROsk91........EGX72Es....k1.
.....Ksulz1.......kz.Iwl31E5.I../0...U2....D....j0...U4...U8....4/...UHB...UJr5I
1./U.41P17wcHRIlclra2D3ECNA61c..rhIA..klrlkCx9zj6s41pmERLz9...........k.8.UUY72.
......................EFpzsIi1wDUMkMzzmFD/..sKtn7mv/.v/STeucQJ.k..........E7GMYz
I4fJ..E4yVUM04/E.G.at0ZYHz1.u.CzGUYpzEU2Iwjdg43..sNj44Fe7.287lvba5Ztz.kEbrdaFJyD
2IUHyvsHY...IuC52512./UJqCEKICtD.6ifRMSXjx1..wsff0EzxrDcUB0Pe7..xrTzUee8Smvi.oTz
x1OuU/8cU0EzxrDcNsLT/88.xrTzUydTU08c..8cU0upy/8cU0.cU08cKw5cU08.U08cU4pTU08c..8c
U0eqz/8cU0.cU08c...cU08czz/cU08cyz1cU08cxz3cU08c.Y4RtpmPap0RcJK9aJ5Rp7LNhU2FhQLM
E....AU.V2U.....I....k....kIdJaQkVIOg7KNmF5...............................U/4MU/
4M........UNaNaNaN4../........zD........kz1........wz...........................
...............................................E........kz1.....................
.....................2.....3....A....AJOZ75Q6Z4PWJaQo/..........................
.....MU/4MU/4................UzD........kz1........wz.........zD................
..........................................................2........wz...........
................................/....E/...E.....T7LNXZ4QmxqMVl4Km...............
................................OaNaNaNa7z1.............................kz1.....
................................................................................
.......Fractales75..........................}
{Titel: }
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fractales75
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Posts: 22


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« Reply #3 on: October 11, 2013, 07:21:30 PM »


thank you very much!

 thank you post swing

that's very interesting;
and it's certainly a tip for the topic 'beginners tip' about the noise
these informations will save a lot of time and save a lot of images

anyway , I don't understand "SWL" and "RSM" ... :smiley 
Of course the larger the Render, the lower the SWL and RSM will negate noise too.



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lenord
Fractal Bachius
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Posts: 611


No Matter where you go there you are


« Reply #4 on: October 12, 2013, 10:09:01 PM »

thank you very much!

 thank you post swing

that's very interesting;
and it's certainly a tip for the topic 'beginners tip' about the noise
these informations will save a lot of time and save a lot of images

anyway , I don't understand "SWL" and "RSM" ... :smiley 


RSM is the Raystep Multiplier and SWL is Stepwidth Limiter settings in the Render settings.
For a Full Res image typical 3000x1688 I use a RSM of 0.05, SWL of 0.1, Stepcount 8-14, Smooth Normals 3-4, Normals on DE and first step Random on and Raystep sub DE Stop (if DE Stop is 2 or greater)
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chaos_crystal
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Posts: 98


I Have No Limits.


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« Reply #5 on: December 12, 2013, 08:31:54 PM »

I have noisy problems in images often too, so maybe lenord's suggestions will also help me!  embarrass
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I conceived and developed a new geometry of nature and implemented its use in a number of diverse fields. It describes many of the irregular and fragmented patterns around us, and leads to full-fledged theories, by identifying a family of shapes I call fractals.

Ś Benoit Mandelbrot
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