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# SPDX-License-Identifier: GPL-2.0-or-later
# Filename : sketchy_topology_preserved.py
# Author : Stephane Grabli
# Date : 04/08/2005
# Purpose : The topology of the strokes is built
# so as to chain several times the same ViewEdge.
# The topology of the objects is preserved
from freestyle.chainingiterators import pySketchyChainSilhouetteIterator
from freestyle.predicates import (
QuantitativeInvisibilityUP1D,
TrueUP1D,
)
from freestyle.shaders import (
ConstantColorShader,
IncreasingThicknessShader,
SamplingShader,
SmoothingShader,
SpatialNoiseShader,
)
from freestyle.types import Operators
upred = QuantitativeInvisibilityUP1D(0)
Operators.select(upred)
Operators.bidirectional_chain(pySketchyChainSilhouetteIterator(3, True))
shaders_list = [
SamplingShader(4),
SpatialNoiseShader(20, 220, 2, True, True),
IncreasingThicknessShader(4, 8),
SmoothingShader(300, 0.05, 0, 0.2, 0, 0, 0, 0.5),
ConstantColorShader(0.6, 0.2, 0.0),
]
Operators.create(TrueUP1D(), shaders_list)
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