Need Help~ How to use simdnoise::NoiseBuilder::ridge_2d_offset?

[zzhgithub]

Maybe this issue is not about minkrift~~
I just find your world look good with using of imdnoise::NoiseBuilder::ridge_2d_offset

I also use it to build a world but it looks like very ugly. Why?
IF any tips on set params??
my core code like this:

let withd = 100;
let (noise, min, max) = simdnoise::NoiseBuilder::ridge_2d_offset(
            0.0,   
            withd, 
            0.0,
            withd,
        ) 
        .with_freq(0.025)
        .with_octaves(5)
        .with_seed(2022)
        .generate();

        for x in 0..withd {
            for z in 0..withd {
                info!("[{}],[{}]", x + z, noise[x + z]);
                let yy = (5.0 - noise[x + z]) * 512.0 + 128.0;
                for y in 0..256 {
                    let p = Point3D::new(x as i32, y as i32, z as i32);
                    if (y as f32) < yy {
                        res.data.insert(p, grass.clone());
                    }
                }
            }
        }

it any wrong with it ?
Please help me thanks.