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namespaceScalar Noise Fields7 functions

datumhue.noise

Perlin / simplex / cellular / fractal noise samplers.

Returns handles
NoiseSampler

Functions 7

datumhue.noise.perlin

function
datumhue.noise.perlin(opts?: noise.BaseOptions) -> NoiseSampler

Create a Perlin-noise sampler.

Example
-- A lower frequency gives broader hills.
local hills = datumhue.noise.perlin({ seed = 7, frequency = 0.05 })
print(string.format("%.3f", hills:at(3.3, 4.7))) --> 0.051
-- The same seed gives the same field.
local again = datumhue.noise.perlin({ seed = 7, frequency = 0.05 })
print(again:at(3.3, 4.7) == hills:at(3.3, 4.7)) --> true

opts noise.BaseOptions options 2 keys

KeyTypeDefaultDescription
seedinteger0Random seed for the noise field.
frequencynumber0.01Spatial frequency of the noise.

datumhue.noise.simplex

function
datumhue.noise.simplex(opts?: noise.BaseOptions) -> NoiseSampler

Create a simplex-noise sampler.

opts noise.BaseOptions options 2 keys

KeyTypeDefaultDescription
seedinteger0Random seed for the noise field.
frequencynumber0.01Spatial frequency of the noise.

datumhue.noise.simplex_smooth

function
datumhue.noise.simplex_smooth(opts?: noise.BaseOptions) -> NoiseSampler

Create a smooth simplex-noise sampler.

opts noise.BaseOptions options 2 keys

KeyTypeDefaultDescription
seedinteger0Random seed for the noise field.
frequencynumber0.01Spatial frequency of the noise.

datumhue.noise.value

function
datumhue.noise.value(opts?: noise.BaseOptions) -> NoiseSampler

Create a value-noise sampler.

opts takes the same keys as noise.BaseOptions.

datumhue.noise.value_cubic

function
datumhue.noise.value_cubic(opts?: noise.BaseOptions) -> NoiseSampler

Create a cubic value-noise sampler.

opts takes the same keys as noise.BaseOptions.

datumhue.noise.cellular

function
datumhue.noise.cellular(opts?: noise.CellularOptions) -> NoiseSampler

Create a cellular (Worley) noise sampler.

Example
-- One flat value per cell, like paving stones.
local stones = datumhue.noise.cellular({
    seed = 1,
    frequency = 0.1,
    distance = "euclidean",
    return_type = "cell_value",
    jitter = 0.8,
})
print(string.format("%.3f", stones:at(3, 4))) --> -0.165

opts noise.CellularOptions options 5 keys, 2 inherited

KeyTypeDefaultDescription
distance"euclidean" | "euclidean_sq" | "manhattan" | "hybrid""euclidean_sq"Distance metric.
return_type"cell_value" | "distance" | "distance2" | "distance2_add" | "distance2_sub" | "distance2_mul" | "distance2_div""distance"Return mode.
jitternumber1Cell-point jitter amount.
From noise.BaseOptions
seedinteger0Random seed for the noise field.
frequencynumber0.01Spatial frequency of the noise.

datumhue.noise.fbm

function
datumhue.noise.fbm(opts?: noise.FbmOptions) -> NoiseSampler

Create a fractal (fBm / ridged / ping-pong) sampler.

Example
-- Five layers, each at twice the frequency and half the strength.
local ridges = datumhue.noise.fbm({
    source = "simplex",
    type = "ridged",
    octaves = 5,
    lacunarity = 2,
    gain = 0.5,
    frequency = 0.02,
    seed = 3,
})
print(string.format("%.3f", ridges:at(10, 20))) --> -0.129

opts noise.FbmOptions options 9 keys

KeyTypeDefaultDescription
source"perlin" | "simplex" | "simplex_smooth" | "value" | "value_cubic""perlin"Base noise kind the fractal layers.
type"fbm" | "ridged" | "ping_pong""fbm"Fractal combination mode.
seedinteger0Random seed for the noise field.
frequencynumber0.01Spatial frequency of the base noise.
octavesinteger4Number of fractal layers summed.
lacunaritynumber2Frequency multiplier between successive octaves.
gainnumber0.5Amplitude multiplier between successive octaves.
weighted_strengthnumber0How much each octave's amplitude is weighted by the previous octave's value.
ping_pong_strengthnumber2Folding strength used by the ping-pong fractal mode.

Types 5

noise.BaseOptions

options

options 2 keys

KeyTypeDefaultDescription
seedinteger0Random seed for the noise field.
frequencynumber0.01Spatial frequency of the noise.

Used by: datumhue.noise.perlin, datumhue.noise.simplex, datumhue.noise.simplex_smooth, datumhue.noise.value, datumhue.noise.value_cubic

Extended by: noise.CellularOptions

noise.CellularDistance

enum
ValueDescription
"euclidean"
"euclidean_sq"
"manhattan"
"hybrid"

Nested in: noise.CellularOptions

noise.CellularReturn

enum
ValueDescription
"cell_value"
"distance"
"distance2"
"distance2_add"
"distance2_sub"
"distance2_mul"
"distance2_div"

Nested in: noise.CellularOptions

noise.FractalType

enum
ValueDescription
"fbm"
"ridged"
"ping_pong"

Nested in: noise.FbmOptions

noise.NoiseSource

enum
ValueDescription
"perlin"
"simplex"
"simplex_smooth"
"value"
"value_cubic"

Nested in: noise.FbmOptions

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