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# SPDX-FileCopyrightText: 2008-2023 Blender Authors
#
# SPDX-License-Identifier: GPL-2.0-or-later
# Author : Stephane Grabli
# Date : 04/08/2005
# Purpose : The thickness and the color of the strokes vary continuously
# independently from occlusions although only
# visible lines are actually drawn. This is equivalent
# to assigning the thickness using a parameterization covering
# the complete silhouette (visible+invisible) and drawing
# the strokes using a second parameterization that only
# covers the visible portions.
from freestyle.chainingiterators import ChainSilhouetteIterator
from freestyle.predicates import (
QuantitativeInvisibilityUP1D,
TrueUP1D,
)
from freestyle.shaders import (
ConstantColorShader,
IncreasingColorShader,
IncreasingThicknessShader,
SamplingShader,
pyHLRShader,
)
from freestyle.types import Operators
Operators.select(QuantitativeInvisibilityUP1D(0))
# Chain following the same nature, but without the restriction
# of staying inside the selection (False).
Operators.bidirectional_chain(ChainSilhouetteIterator(False))
shaders_list = [
SamplingShader(20),
IncreasingThicknessShader(1.5, 30),
ConstantColorShader(0.0, 0.0, 0.0),
IncreasingColorShader(1, 0, 0, 1, 0, 1, 0, 1),
pyHLRShader(), # this shader draws only visible portions
]
Operators.create(TrueUP1D(), shaders_list)
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