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# SPDX-License-Identifier: GPL-2.0-or-later
# Filename : backbone_stretcher.py
# Author : Stephane Grabli
# Date : 04/08/2005
# Purpose : Stretches the geometry of visible lines
from freestyle.chainingiterators import ChainSilhouetteIterator
from freestyle.predicates import (
NotUP1D,
QuantitativeInvisibilityUP1D,
TrueUP1D,
)
from freestyle.shaders import (
BackboneStretcherShader,
ConstantColorShader,
)
from freestyle.types import Operators
Operators.select(QuantitativeInvisibilityUP1D(0))
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
shaders_list = [
ConstantColorShader(0.5, 0.5, 0.5),
BackboneStretcherShader(20),
]
Operators.create(TrueUP1D(), shaders_list)
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