54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
# SPDX-FileCopyrightText: 2008-2023 Blender Authors
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#
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# SPDX-License-Identifier: GPL-2.0-or-later
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# Author : Stephane Grabli
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# Date : 04/08/2005
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# Purpose : Simulates a big brush fr oriental painting
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from freestyle.chainingiterators import ChainSilhouetteIterator
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from freestyle.functions import pyInverseCurvature2DAngleF0D
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from freestyle.predicates import (
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NotUP1D,
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QuantitativeInvisibilityUP1D,
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pyDensityUP1D,
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pyHigherLengthUP1D,
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pyHigherNumberOfTurnsUP1D,
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pyLengthBP1D,
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pyParameterUP0D,
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)
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from freestyle.shaders import (
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BezierCurveShader,
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ConstantColorShader,
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ConstantThicknessShader,
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SamplingShader,
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TipRemoverShader,
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pyNonLinearVaryingThicknessShader,
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pySamplingShader,
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)
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from freestyle.types import IntegrationType, Operators
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Operators.select(QuantitativeInvisibilityUP1D(0))
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Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(QuantitativeInvisibilityUP1D(0)))
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# Splits strokes at points of highest 2D curvature
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# when there are too many abrupt turns in it
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func = pyInverseCurvature2DAngleF0D()
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Operators.recursive_split(func, pyParameterUP0D(0.2, 0.8), NotUP1D(pyHigherNumberOfTurnsUP1D(3, 0.5)), 2)
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# Keeps only long enough strokes
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Operators.select(pyHigherLengthUP1D(100))
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# Sorts so as to draw the longest strokes first
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# (this will be done using the causal density)
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Operators.sort(pyLengthBP1D())
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shaders_list = [
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pySamplingShader(10),
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BezierCurveShader(30),
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SamplingShader(50),
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ConstantThicknessShader(10),
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pyNonLinearVaryingThicknessShader(4, 25, 0.6),
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ConstantColorShader(0.2, 0.2, 0.2, 1.0),
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TipRemoverShader(10),
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]
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# Use the causal density to avoid cluttering
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Operators.create(pyDensityUP1D(8, 0.4, IntegrationType.MEAN), shaders_list)
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