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Questions tagged [noise]

For questions about creating or working with noise functions (in 1D, 2D, 3D or more).

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15 votes
1 answer
505 views

Is all grid based noise inevitably anisotropic?

I'm interested in how this applies to higher numbers of dimensions too, but for this question I will focus solely on 2D grids. I know that Perlin noise is not isotropic (direction invariant), and ...
trichoplax is on Codidact now's user avatar
22 votes
1 answer
4k views

Why does my Perlin Noise look "blocky"?

I tried to implement Perlin Noise by myself using just the theory (following flafla2.github.io/2014/08/09/perlinnoise.html). Unfortunately I was unable to achieve the look of the "original" Perlin ...
sarasvati's user avatar
  • 323
17 votes
1 answer
4k views

How can I generate procedural noise on a sphere?

I would like to generate procedural noise on the surface of a sphere (e.g. to procedurally generate planets or marble-textured balls). Of course, I could just take a standard noise algorithm and map ...
Martin Ender's user avatar
  • 2,730
14 votes
1 answer
891 views

Why is it twice as expensive to make a noise function that can be tiled?

I've seen in several places that making Perlin noise loop seamlessly requires calculating it twice in slightly different ways, and summing the two results. This Perlin noise math FAQ gives a formula: ...
trichoplax is on Codidact now's user avatar
9 votes
3 answers
2k views

What's a proper way to clamp dither noise?

When reducing color depth and dithering with a 2 bit noise (with n=]0.5,1.5[ and output=floor(input*(2^bits-1) + n)), the ends of the value range (inputs 0.0 and 1.0) are noisy. It would be desirable ...
hotmultimedia's user avatar
6 votes
0 answers
233 views

Noise shaping for dithering with gamma?

The context of this question is correct dithering of color with gamma correction. In dithering we add (shaped) noise $n$ to a signal $s \in [0, 1]$ based on a random variable $r \in [0, 1]$ $$s' = s +...
orlp's user avatar
  • 186