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perlin.py
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perlin.py
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from opensimplex import OpenSimplex
gen = OpenSimplex()
length = 20
width = 20
freq1 = 15
freq2 = 10
freq3 = 20
def noise(nx, ny):
# Rescale from -1.0:+1.0 to 0.0:1.0
return gen.noise2(nx / 10, ny / 10) / 3.0 + 0.5 * 10
def lerp(t, a, b):
"""Linear interpolation between a and b, given a fraction t."""
return a + t * (b - a)
elevation = []
for y in range(length):
elevation.append([0] * width)
for x in range(width):
nx = x / width - 0.5
ny = y / length - 0.5
elevation[y][x] = lerp(noise(nx * freq1, ny * freq1), noise(nx * freq2, ny * freq2), noise(nx * freq3, ny * freq3))