[BUG] Simplex Noise generates Artifacts

[isiko]

I'm trying to generate Simplex Noise, but there it has some weird Artifacts.

I'm using the following Code to create and sample a PlaneMapBuilder:

let luma_map = PlaneMapBuilder::new_fn(|point, nh| simplex_2d(point.into(), nh).0, &hasher)
    .set_size(width as usize, height as usize)
    .set_is_seamless(tiling)
    .build();

for y in 0..height {
    for x in 0..width {
        let luminance: f64 = luma_map.get_value(x as usize, y as usize) / 2. + 0.5;
        // Insert sample into Image
    }
}

The resulting output for 100x100 Image looks like this for me:

[Lazauya]

Also seeing this issue. It looks like it's probably selecting gradients incorrectly in the obtuse corners.

[Razaekel]

This should be fixed in eee47438e3b8cc64d02f7416592d19a69be78b4e.