A simple perlin noise implementation in Rust

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# Example ```rust extern crate perlin_noise as perlin; use perlin::PerlinNoise

fn main() { let perlin = PerlinNoise::new();

println!("{}",perlin.get(132.2)); println!("{}",perlin.get2d([12.0,32.0])); println!("{}",perlin.get3d([12.0,32.0,25.0])); } ```