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Fri, Jan 31, 19:07

surface
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#!/usr/bin/env python3
# -*- mode: python; coding: utf-8 -*-
# vim: set ft=python:
"""
Create a random self-affine rough surface from command line parameters.
"""
import argparse
import sys
import time
import tamaas as tm
import numpy as np
__author__ = "Lucas Frérot"
__copyright__ = """Copyright (©) 2019, EPFL (École Polytechnique Fédérale de Lausanne),
Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)"""
__license__ = "AGPL"
__email__ = "lucas.frerot@epfl.ch"
tm.initialize()
parser = argparse.ArgumentParser(
description="Generate a self-affine rough surface"
)
parser.add_argument("--cutoffs", "-Q",
nargs=3,
type=int,
help="Long, rolloff and short wavelength cutoffs",
required=True)
parser.add_argument("--sizes",
nargs=2,
type=int,
help="Number of points",
required=True)
parser.add_argument("--hurst", "-H",
type=float,
help="Hurst exponent",
required=True)
parser.add_argument("--rms",
type=float,
help="Root-mean-square of heights",
default=1.)
parser.add_argument("--seed",
type=int,
help="Random seed",
default=int(time.time()))
parser.add_argument("--output", "-o",
help="Output file name (compressed if .gz)")
args = parser.parse_args()
spectrum = tm.Isopowerlaw2D()
spectrum.q0 = args.cutoffs[0]
spectrum.q1 = args.cutoffs[1]
spectrum.q2 = args.cutoffs[2]
spectrum.hurst = args.hurst
generator = tm.SurfaceGeneratorRandomPhase2D()
generator.setSizes(args.sizes)
generator.random_seed = args.seed
generator.setSpectrum(spectrum)
surface = generator.buildSurface()
if not args.output:
output = sys.stdout
else:
output = args.output
np.savetxt(output.buffer, surface)
tm.finalize()

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