Struct veloren_world::sim::util::HybridMulti

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pub struct HybridMulti {
    pub octaves: usize,
    pub frequency: f64,
    pub lacunarity: f64,
    pub persistence: f64,
    pub offset: f64,
    seed: u32,
    sources: Vec<Perlin>,
}
Expand description

Noise function that outputs hybrid Multifractal noise.

The result of this multifractal noise is that valleys in the noise should have smooth bottoms at all altitudes.

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§octaves: usize

Total number of frequency octaves to generate the noise with.

The number of octaves control the amount of detail in the noise function. Adding more octaves increases the detail, with the drawback of increasing the calculation time.

§frequency: f64

The number of cycles per unit length that the noise function outputs.

§lacunarity: f64

A multiplier that determines how quickly the frequency increases for each successive octave in the noise function.

The frequency of each successive octave is equal to the product of the previous octave’s frequency and the lacunarity value.

A lacunarity of 2.0 results in the frequency doubling every octave. For almost all cases, 2.0 is a good value to use.

§persistence: f64

A multiplier that determines how quickly the amplitudes diminish for each successive octave in the noise function.

The amplitude of each successive octave is equal to the product of the previous octave’s amplitude and the persistence value. Increasing the persistence produces “rougher” noise.

H = 1.0 - fractal increment = -ln(persistence) / ln(lacunarity). For a fractal increment between 0 (inclusive) and 1 (exclusive), keep persistence between 1 / lacunarity (inclusive, for low fractal dimension) and 1 (exclusive, for high fractal dimension).

§offset: f64

An offset that is added to the output of each sample of the underlying Perlin noise function. Because each successive octave is weighted in part by the previous signal’s output, increasing the offset will weight the output more heavily towards 1.0.

§seed: u32§sources: Vec<Perlin>

Implementations§

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impl HybridMulti

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pub const DEFAULT_FREQUENCY: f64 = 2f64

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pub const DEFAULT_LACUNARITY: f64 = 2f64

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pub const DEFAULT_OCTAVES: usize = 6usize

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pub const DEFAULT_OFFSET: f64 = 0.69999999999999996f64

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pub const DEFAULT_PERSISTENCE: f64 = 0.8125f64

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pub const DEFAULT_SEED: u32 = 0u32

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pub const MAX_OCTAVES: usize = 32usize

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pub fn new() -> Self

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pub fn set_offset(self, offset: f64) -> Self

Trait Implementations§

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impl Clone for HybridMulti

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fn clone(&self) -> HybridMulti

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for HybridMulti

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for HybridMulti

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl MultiFractal for HybridMulti

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fn set_octaves(self, octaves: usize) -> Self

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fn set_frequency(self, frequency: f64) -> Self

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fn set_lacunarity(self, lacunarity: f64) -> Self

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fn set_persistence(self, persistence: f64) -> Self

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impl NoiseFn<[f64; 2]> for HybridMulti

2-dimensional HybridMulti noise

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fn get(&self, point: [f64; 2]) -> f64

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impl NoiseFn<[f64; 3]> for HybridMulti

3-dimensional HybridMulti noise

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fn get(&self, point: [f64; 3]) -> f64

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impl NoiseFn<[f64; 4]> for HybridMulti

4-dimensional HybridMulti noise

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fn get(&self, point: [f64; 4]) -> f64

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impl Seedable for HybridMulti

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fn set_seed(self, seed: u32) -> Self

Set the seed for the function implementing the Seedable trait
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fn seed(&self) -> u32

Getter to retrieve the seed from the function

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