pub struct Fbm {
pub octaves: usize,
pub frequency: f64,
pub lacunarity: f64,
pub persistence: f64,
/* private fields */
}
Expand description
Noise function that outputs fBm (fractal Brownian motion) noise.
fBm is a monofractal method. In essence, fBm has a constant fractal dimension. It is as close to statistically homogeneous and isotropic as possible. Homogeneous means “the same everywhere” and isotropic means “the same in all directions” (note that the two do not mean the same thing).
The main difference between fractal Brownian motion and regular Brownian motion is that while the increments in Brownian motion are independent, the increments in fractal Brownian motion depend on the previous increment.
fBm is the result of several noise functions of ever-increasing frequency and ever-decreasing amplitude.
fBm is commonly referred to as Perlin noise.
Fields§
§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.
Implementations§
source§impl Fbm
impl Fbm
pub const DEFAULT_SEED: u32 = 0u32
pub const DEFAULT_OCTAVE_COUNT: usize = 6usize
pub const DEFAULT_FREQUENCY: f64 = 1f64
pub const DEFAULT_LACUNARITY: f64 = 2.0943951023931953f64
pub const DEFAULT_PERSISTENCE: f64 = 0.5f64
pub const MAX_OCTAVES: usize = 32usize
pub fn new() -> Fbm
Trait Implementations§
source§impl MultiFractal for Fbm
impl MultiFractal for Fbm
fn set_octaves(self, octaves: usize) -> Fbm
fn set_frequency(self, frequency: f64) -> Fbm
fn set_lacunarity(self, lacunarity: f64) -> Fbm
fn set_persistence(self, persistence: f64) -> Fbm
Auto Trait Implementations§
impl RefUnwindSafe for Fbm
impl Send for Fbm
impl Sync for Fbm
impl Unpin for Fbm
impl UnwindSafe for Fbm
Blanket Implementations§
source§impl<S, D, Swp, Dwp, T> AdaptInto<D, Swp, Dwp, T> for S
impl<S, D, Swp, Dwp, T> AdaptInto<D, Swp, Dwp, T> for S
source§fn adapt_into_using<M>(self, method: M) -> Dwhere
M: TransformMatrix<Swp, Dwp, T>,
fn adapt_into_using<M>(self, method: M) -> Dwhere
M: TransformMatrix<Swp, Dwp, T>,
source§fn adapt_into(self) -> D
fn adapt_into(self) -> D
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T, U> ConvertInto<U> for Twhere
U: ConvertFrom<T>,
impl<T, U> ConvertInto<U> for Twhere
U: ConvertFrom<T>,
source§fn convert_into(self) -> U
fn convert_into(self) -> U
source§fn convert_unclamped_into(self) -> U
fn convert_unclamped_into(self) -> U
source§fn try_convert_into(self) -> Result<U, OutOfBounds<U>>
fn try_convert_into(self) -> Result<U, OutOfBounds<U>>
OutOfBounds
error is returned which contains the unclamped color. Read more