blender/release/scripts/freestyle/style_modules/nature.py

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#  Filename : nature.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Uses the NatureUP1D predicate to select the lines
#             of a given type (among Nature.SILHOUETTE, Nature.CREASE, Nature.SUGGESTIVE_CONTOURS,
#             Nature.BORDERS).
#             The suggestive contours must have been enabled in the 
#             options dialog to appear in the View Map.

from freestyle import ChainSilhouetteIterator, IncreasingColorShader, \
    IncreasingThicknessShader, Nature, Operators, TrueUP1D
from PredicatesU1D import pyNatureUP1D
from logical_operators import NotUP1D

Operators.select(pyNatureUP1D(Nature.SILHOUETTE))
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(pyNatureUP1D(Nature.SILHOUETTE)))
shaders_list = [
    IncreasingThicknessShader(3, 10),
    IncreasingColorShader(0.0, 0.0, 0.0, 1, 0.8, 0, 0, 1),
    ]
Operators.create(TrueUP1D(), shaders_list)