Ridge showing up in terrain mesh generated with Simplexnoise

Question

I've been experimenting with generating terrain using a MeshInstance and the simplexnoise. It seems to be working fairly well, however no matter what noise I generate, there is always this rut/ridge thing generated in the middle of the mesh. I've edited the parameters a bit to make it more visible, but it's there no matter what they are

It's clearly visible, even with more extreme terrain


The fact that it's there no matter what I do leads me to belive that it's a problem caused by my code that changes the vertex heights. I'm pretty new to using meshes, so I would not be surprised. This is my code:

func reload_mesh_points():
print("Reloading mesh points")
var mesh = ArrayMesh.new()
var base = PlaneMesh.new()
base.subdivide_depth = division_depth
base.subdivide_width = division_width
base.size = plane_size
mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, base.get_mesh_arrays())
var mdt = MeshDataTool.new()
mdt.create_from_surface(mesh, 0)
var row = 0
var mesh_len = division_width + 1

for i in range(mdt.get_vertex_count()):
    print(i % mesh_len)
    var noise_sample = noise.get_noise_2d((row * noise_frequency) + noise_offset.y, ((i % mesh_len) * noise_frequency) + noise_offset.x)
    if i % mesh_len == 0:
        row += 1

    var vertex = mdt.get_vertex(i)
    var vnorm = mdt.get_vertex_normal(i)
    if randomize_vertexes:
        vertex += vnorm.normalized() * rng.randf_range(randomize_min, randomize_max)
    elif use_noise:
        vertex += vnorm.normalized() * noise_sample * noise_amplifier
    else:   
        vertex += vnorm * multiplier
    mdt.set_vertex(i, vertex)
mesh.surface_remove(0)
mdt.commit_to_surface(mesh)
self.set_mesh(mesh)

Any help as to how to get rid of this ridge is greatly appreciated.

Answer 1

Hi,

Maybe you've already fixed it, but I think the problem may arise from using 'i % mesh_len' here.

Alternatively, you could get the location of the current vertex and use that to sample the noise