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

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#  Filename : occluded_by_specific_object.py
#  Author   : Stephane Grabli
#  Date     : 04/08/2005
#  Purpose  : Draws only the lines that are occluded by a given object

from freestyle import ChainSilhouetteIterator, ConstantColorShader, ConstantThicknessShader, \
    Id, Operators, QuantitativeInvisibilityUP1D, SamplingShader, TrueUP1D
from PredicatesU1D import pyIsInOccludersListUP1D
from logical_operators import AndUP1D, NotUP1D

## the id of the occluder (use SHIFT+click on the ViewMap to
## retrieve ids)
id = Id(3,0)
upred = AndUP1D(NotUP1D(QuantitativeInvisibilityUP1D(0)), pyIsInOccludersListUP1D(id))
Operators.select(upred)
Operators.bidirectional_chain(ChainSilhouetteIterator(), NotUP1D(upred))
shaders_list = [
    SamplingShader(5),
    ConstantThicknessShader(3),
    ConstantColorShader(0.3, 0.3, 0.3, 1),
    ]
Operators.create(TrueUP1D(), shaders_list)