Function simdnoise::avx2::fbm_3d

pub unsafe fn fbm_3d(
    x: __m256, 
    y: __m256, 
    z: __m256, 
    freq: __m256, 
    lac: __m256, 
    gain: __m256, 
    octaves: u8
) -> __m256

This is supported with target feature avx2 only.

Get a single value of 3d fractal brownian motion.