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Welcome to Fractal Forums > Fractal Software > 3D Fractal Generation > Mandelbulb 3d > Fine tuning ??
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CeleXaoS
Alien
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Posts: 37


bleeding nose
« on: May 19, 2012, 06:59:31 PM »
Its me again .
This time i want to ask about the noise effect that i usually  observe in my fractals.
I used to believe that i was being just plain unlucky and immediately changed my formulas without even thinking about dealing with the
frustrating dust particles.

Why is noise generated ?? Is it  the result of miscalculations of the program or just a faulty shape .?
I read that i can avert the undesired effect by adjusting the values in:

Raystep Multiplier
Stepwidth limiter
Stepcount for Binary search and Smooth normals  ( i think i should input higher values  huh?)

Tips and Advice will be greatly appreciated thanks
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Sockratease
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Posts: 3181
« Reply #1 on: May 19, 2012, 07:11:12 PM »
Quote from: CeleXaoS on May 19, 2012, 06:59:31 PM
Why is noise generated ?? Is it  the result of miscalculations of the program or just a faulty shape .?

Neither.  It's inherent in the fractal.  These shapes are not solid - they are "point clouds"  

Some points are just "stray"

Other ways to reduce the noise would include increasing the DE Stop, rendering at 2 or 3 times oversized and scaling down, or post work  (a "blur brush" or even a "clone stamp" can work wonders!).
« Last Edit: May 19, 2012, 07:21:50 PM by Sockratease » Logged
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DarkBeam
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Fragments of the fractal -like the tip of it
« Reply #2 on: May 19, 2012, 07:48:07 PM »
Quote from: Sockratease on May 19, 2012, 07:11:12 PM
(a "clone stamp" can work wonders!).

Clone stamp? shocked Noooo grin
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Sockratease
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« Reply #3 on: May 19, 2012, 08:00:23 PM »
Quote from: DarkBeam on May 19, 2012, 07:48:07 PM
Clone stamp? shocked Noooo grin

If the alternative is to set the raystep multiplier so low that it wants a week to render  -  Absolutely Yes!

We're just talking about getting rid of noise.  Not altering entire compositions   police
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CeleXaoS
Alien
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Posts: 37


bleeding nose
« Reply #4 on: May 19, 2012, 09:14:35 PM »
Hahah .... Azn Azn yes Photoshop will work indeed !!   
  But I will try to experiment with the Raystep multiplier even if it takes an eternity to render. snore snore
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lxh
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Posts: 178
« Reply #5 on: May 20, 2012, 07:37:43 AM »
Sometimes the noise is only in few critical areas. In this case i lower raystep multiplier and stepwidth limiter and use "recalculate a selection" of the post processing. If this works, i just have to recalculate the shadows. This is much faster than calculate the whole image. But it only works with the same DEstop value. Otherwise you get edges of the selection.
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