Applying Perlin noise to plane multiple times/ sphere.

[mhueppe]

Description

Hey!
I have some questions regarding the Perlin noise and the pv.sample_function in general.

1. How would you go about applying Perlin noise to a sphere? I would like to have a little bit disformed sphere.
2. Can you apply Perlin noise to a mesh (sphere/plane) multiple times? I would like to have a plane with some rough 'waves' and high detailed noise on top of them (thus having big waves with little waves in them).
3. What exactly does the third parameter in the frequency do? After playing around with some values I haven't noticed how it affected the noise.

Example Code

These are the two different frequencies/Perlin noises that I would like to apply to one plane. Additionally, it shows the plane they respectively create.

def smooth_and_plot(sampled : pv.core.grid.UniformGrid):
    mesh = sampled.warp_by_scalar('scalars')
    mesh = mesh.extract_surface()

    # clean and smooth a little to reduce perlin noise artifacts
    mesh = mesh.smooth(n_iter=100, inplace=True, relaxation_factor=0.07)
    mesh.plot()


def gravel_plane():
    freq = [180, 180, 50]
    noise = pv.perlin_noise(0.2, freq, (0, 0, 0))
    sampled = pv.sample_function(noise,
                                 bounds=(-10, 2, -10, 10, -10, 10),
                                 dim=(500, 500, 1))

    smooth_and_plot(sampled)


def bumpy_plane():
    freq = [0.5, 0.7, 0]
    noise = pv.perlin_noise(0.5, freq, (-10, -10, -10))
    sampled = pv.sample_function(noise,
                                 bounds=(-10, 2, -10, 10, -10, 10),
                                 dim=(500, 500, 1))

    smooth_and_plot(sampled)

[mhueppe]

My problem was kindly answered by Andras Deak on SO: https://stackoverflow.com/questions/68729394/applying-perlin-noise-to-plane-multiple-times-sphere