def get_test_stroke():
"""Returns a static stroke object for testing """
from freestyle.types import Stroke, Interface0DIterator, StrokeVertexIterator, SVertex, Id, StrokeVertex
# points for our fake stroke
points = (Vector((1.0, 5.0, 3.0)), Vector(
(1.0, 2.0, 9.0)), Vector((6.0, 2.0, 3.0)), Vector(
(7.0, 2.0, 3.0)), Vector((2.0, 6.0, 3.0)), Vector((2.0, 8.0, 3.0)))
ids = (Id(0, 0), Id(1, 1), Id(2, 2), Id(3, 3), Id(4, 4), Id(5, 5))
stroke = Stroke()
it = iter(stroke)
for svert in map(SVertex, points, ids):
stroke.insert_vertex(StrokeVertex(svert), it)
it = iter(stroke)
stroke.update_length()
return stroke
# Purpose : Draws only the lines that are occluded by a given object
from freestyle.chainingiterators import ChainSilhouetteIterator
from freestyle.predicates import (
AndUP1D,
NotUP1D,
QuantitativeInvisibilityUP1D,
TrueUP1D,
pyIsInOccludersListUP1D,
)
from freestyle.shaders import (
ConstantColorShader,
ConstantThicknessShader,
SamplingShader,
)
from freestyle.types import Id, Operators
# 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)