noise_angle

Gradient noise over a plane whose lattice gradients are unit vectors at a hashed angle, and the fractal sum of it.

• zero_angle_gradient2(p, seed): gradient noise with quintic interpolation, roughly -0.7 to 0.7.
• zero_angle_fbm2(p, octaves, lacunarity, gain, seed): octaves layers, each lacunarity times finer and gain times as strong as the one before, octave i (from 0) drawn from seed + i * 7919, summed and divided by the root of the sum of the squared strengths.
• zero_angle_warped2(p, warp, feature, seed): p pushed by a second noise, two 4-octave sums from seeds of their own, scaled by warp / feature noise units; a warp of 0 or less leaves p where it is.

#include "@builtin::systems.procgen.kernels.noise_angle"

fn relief(p: vec2<f32>) -> f32 { return zero_angle_fbm2(p, 6u, 2.0, 0.5, 1u); }