Differential D163 Diff 474 release/scripts/freestyle/styles/multiple_parameterization.py

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release/scripts/freestyle/styles/multiple_parameterization.py

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				# ##### BEGIN GPL LICENSE BLOCK #####
				#
				# This program is free software; you can redistribute it and/or
				# modify it under the terms of the GNU General Public License
				# as published by the Free Software Foundation; either version 2
				# of the License, or (at your option) any later version.
				#
				# This program is distributed in the hope that it will be useful,
				# but WITHOUT ANY WARRANTY; without even the implied warranty of
				# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
				# GNU General Public License for more details.
				#
				# You should have received a copy of the GNU General Public License
				# along with this program; if not, write to the Free Software Foundation,
				# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
				#
				# ##### END GPL LICENSE BLOCK #####

				# Filename : multiple_parameterization.py
				# 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,
				TextureAssignerShader,
				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),
				TextureAssignerShader(-1),
				pyHLRShader(), ## this shader draws only visible portions
				]
				Operators.create(TrueUP1D(), shaders_list)