57 lines
2.1 KiB
Python
57 lines
2.1 KiB
Python
# ##### BEGIN GPL LICENSE BLOCK #####
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# ##### END GPL LICENSE BLOCK #####
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# Filename : multiple_parameterization.py
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# Author : Stephane Grabli
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# Date : 04/08/2005
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# Purpose : The thickness and the color of the strokes vary continuously
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# independently from occlusions although only
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# visible lines are actually drawn. This is equivalent
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# to assigning the thickness using a parameterization covering
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# the complete silhouette (visible+invisible) and drawing
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# the strokes using a second parameterization that only
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# covers the visible portions.
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from freestyle.chainingiterators import ChainSilhouetteIterator
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from freestyle.predicates import (
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QuantitativeInvisibilityUP1D,
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TrueUP1D,
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)
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from freestyle.shaders import (
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ConstantColorShader,
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IncreasingColorShader,
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IncreasingThicknessShader,
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SamplingShader,
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pyHLRShader,
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)
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from freestyle.types import Operators
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Operators.select(QuantitativeInvisibilityUP1D(0))
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# Chain following the same nature, but without the restriction
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# of staying inside the selection (False).
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Operators.bidirectional_chain(ChainSilhouetteIterator(False))
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shaders_list = [
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SamplingShader(20),
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IncreasingThicknessShader(1.5, 30),
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ConstantColorShader(0.0, 0.0, 0.0),
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IncreasingColorShader(1, 0, 0, 1, 0, 1, 0, 1),
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pyHLRShader(), # this shader draws only visible portions
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]
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Operators.create(TrueUP1D(), shaders_list)
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