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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 #####
import Freestyle
import math
from freestyle_init import *
from logical_operators import *
from ChainingIterators import *
from shaders import *
class ColorRampModifier(StrokeShader):
def __init__(self, blend, influence, ramp):
StrokeShader.__init__(self)
self.__blend = blend
self.__influence = influence
self.__ramp = ramp
def evaluate(self, t):
col = Freestyle.evaluateColorRamp(self.__ramp, t)
col = col.xyz # omit alpha
return col
def blend_ramp(self, a, b):
return Freestyle.blendRamp(self.__blend, a, self.__influence, b)
class CurveMappingModifier(StrokeShader):
def __init__(self, blend, influence, mapping, invert, curve):
StrokeShader.__init__(self)
self.__blend = blend
self.__influence = influence
assert mapping in ("LINEAR", "CURVE")
self.__mapping = getattr(self, mapping)
self.__invert = invert
self.__curve = curve
def LINEAR(self, t):
if self.__invert:
return 1.0 - t
return t
def CURVE(self, t):
return Freestyle.evaluateCurveMappingF(self.__curve, 0, t)
def evaluate(self, t):
return self.__mapping(t)
def blend_curve(self, v1, v2):
fac = self.__influence
facm = 1.0 - fac
if self.__blend == "MIX":
v1 = facm * v1 + fac * v2
elif self.__blend == "ADD":
v1 += fac * v2
elif self.__blend == "MULTIPLY":
v1 *= facm + fac * v2;
elif self.__blend == "SUBTRACT":
v1 -= fac * v2
elif self.__blend == "DIVIDE":
if v2 != 0.0:
v1 = facm * v1 + fac * v1 / v2
elif self.__blend == "DIFFERENCE":
v1 = facm * v1 + fac * abs(v1 - v2)
elif self.__blend == "MININUM":
tmp = fac * v1
if v1 > tmp:
v1 = tmp
elif self.__blend == "MAXIMUM":
tmp = fac * v1
if v1 < tmp:
v1 = tmp
else:
raise ValueError("unknown curve blend type: " + self.__blend)
return v1
# Along Stroke modifiers
def iter_t2d_along_stroke(stroke):
total = stroke.getLength2D()
distance = 0.0
it = stroke.strokeVerticesBegin()
while not it.isEnd():
p = it.getObject().getPoint()
if not it.isBegin():
distance += (prev - p).length
prev = p
t = min(distance / total, 1.0)
yield it, t
it.increment()
class ColorAlongStrokeShader(ColorRampModifier):
def getName(self):
return "ColorAlongStrokeShader"
def shade(self, stroke):
for it, t in iter_t2d_along_stroke(stroke):
attr = it.getObject().attribute()
a = attr.getColorRGB()
b = self.evaluate(t)
c = self.blend_ramp(a, b)
attr.setColor(c)
class AlphaAlongStrokeShader(CurveMappingModifier):
def getName(self):
return "AlphaAlongStrokeShader"
def shade(self, stroke):
for it, t in iter_t2d_along_stroke(stroke):
attr = it.getObject().attribute()
a = attr.getAlpha()
b = self.evaluate(t)
c = self.blend_curve(a, b)
attr.setAlpha(c)
class ThicknessAlongStrokeShader(CurveMappingModifier):
def __init__(self, blend, influence, mapping, invert, curve, value_min, value_max):
CurveMappingModifier.__init__(self, blend, influence, mapping, invert, curve)
self.__value_min = value_min
self.__value_max = value_max
def getName(self):
return "ThicknessAlongStrokeShader"
def shade(self, stroke):
for it, t in iter_t2d_along_stroke(stroke):
attr = it.getObject().attribute()
a = attr.getThicknessRL()
a = a[0] + a[1]
b = self.__value_min + self.evaluate(t) * (self.__value_max - self.__value_min)
c = self.blend_curve(a, b)
attr.setThickness(c/2, c/2)
# Distance from Camera modifiers
def iter_distance_from_camera(stroke, range_min, range_max):
normfac = range_max - range_min # normalization factor
it = stroke.strokeVerticesBegin()
while not it.isEnd():
p = it.getObject().getPoint3D() # in the camera coordinate
distance = p.length
if distance < range_min:
t = 0.0
elif distance > range_max:
t = 1.0
else:
t = (distance - range_min) / normfac
yield it, t
it.increment()
class ColorDistanceFromCameraShader(ColorRampModifier):
def __init__(self, blend, influence, ramp, range_min, range_max):
ColorRampModifier.__init__(self, blend, influence, ramp)
self.__range_min = range_min
self.__range_max = range_max
def getName(self):
return "ColorDistanceFromCameraShader"
def shade(self, stroke):
for it, t in iter_distance_from_camera(stroke, self.__range_min, self.__range_max):
attr = it.getObject().attribute()
a = attr.getColorRGB()
b = self.evaluate(t)
c = self.blend_ramp(a, b)
attr.setColor(c)
class AlphaDistanceFromCameraShader(CurveMappingModifier):
def __init__(self, blend, influence, mapping, invert, curve, range_min, range_max):
CurveMappingModifier.__init__(self, blend, influence, mapping, invert, curve)
self.__range_min = range_min
self.__range_max = range_max
def getName(self):
return "AlphaDistanceFromCameraShader"
def shade(self, stroke):
for it, t in iter_distance_from_camera(stroke, self.__range_min, self.__range_max):
attr = it.getObject().attribute()
a = attr.getAlpha()
b = self.evaluate(t)
c = self.blend_curve(a, b)
attr.setAlpha(c)
class ThicknessDistanceFromCameraShader(CurveMappingModifier):
def __init__(self, blend, influence, mapping, invert, curve, range_min, range_max, value_min, value_max):
CurveMappingModifier.__init__(self, blend, influence, mapping, invert, curve)
self.__range_min = range_min
self.__range_max = range_max
self.__value_min = value_min
self.__value_max = value_max
def getName(self):
return "ThicknessDistanceFromCameraShader"
def shade(self, stroke):
for it, t in iter_distance_from_camera(stroke, self.__range_min, self.__range_max):
attr = it.getObject().attribute()
a = attr.getThicknessRL()
a = a[0] + a[1]
b = self.__value_min + self.evaluate(t) * (self.__value_max - self.__value_min)
c = self.blend_curve(a, b)
attr.setThickness(c/2, c/2)
# Distance from Object modifiers
def iter_distance_from_object(stroke, object, range_min, range_max):
scene = Freestyle.getCurrentScene()
mv = scene.camera.matrix_world.copy() # model-view matrix
mv.invert()
loc = object.location * mv # loc in the camera coordinate
normfac = range_max - range_min # normalization factor
it = stroke.strokeVerticesBegin()
while not it.isEnd():
p = it.getObject().getPoint3D() # in the camera coordinate
distance = (p - loc).length
if distance < range_min:
t = 0.0
elif distance > range_max:
t = 1.0
else:
t = (distance - range_min) / normfac
yield it, t
it.increment()
class ColorDistanceFromObjectShader(ColorRampModifier):
def __init__(self, blend, influence, ramp, target, range_min, range_max):
ColorRampModifier.__init__(self, blend, influence, ramp)
self.__target = target
self.__range_min = range_min
self.__range_max = range_max
def getName(self):
return "ColorDistanceFromObjectShader"
def shade(self, stroke):
if self.__target is None:
return
for it, t in iter_distance_from_object(stroke, self.__target, self.__range_min, self.__range_max):
attr = it.getObject().attribute()
a = attr.getColorRGB()
b = self.evaluate(t)
c = self.blend_ramp(a, b)
attr.setColor(c)
class AlphaDistanceFromObjectShader(CurveMappingModifier):
def __init__(self, blend, influence, mapping, invert, curve, target, range_min, range_max):
CurveMappingModifier.__init__(self, blend, influence, mapping, invert, curve)
self.__target = target
self.__range_min = range_min
self.__range_max = range_max
def getName(self):
return "AlphaDistanceFromObjectShader"
def shade(self, stroke):
if self.__target is None:
return
for it, t in iter_distance_from_object(stroke, self.__target, self.__range_min, self.__range_max):
attr = it.getObject().attribute()
a = attr.getAlpha()
b = self.evaluate(t)
c = self.blend_curve(a, b)
attr.setAlpha(c)
class ThicknessDistanceFromObjectShader(CurveMappingModifier):
def __init__(self, blend, influence, mapping, invert, curve, target, range_min, range_max, value_min, value_max):
CurveMappingModifier.__init__(self, blend, influence, mapping, invert, curve)
self.__target = target
self.__range_min = range_min
self.__range_max = range_max
self.__value_min = value_min
self.__value_max = value_max
def getName(self):
return "ThicknessDistanceFromObjectShader"
def shade(self, stroke):
if self.__target is None:
return
for it, t in iter_distance_from_object(stroke, self.__target, self.__range_min, self.__range_max):
attr = it.getObject().attribute()
a = attr.getThicknessRL()
a = a[0] + a[1]
b = self.__value_min + self.evaluate(t) * (self.__value_max - self.__value_min)
c = self.blend_curve(a, b)
attr.setThickness(c/2, c/2)
# Predicates and helper functions
class QuantitativeInvisibilityRangeUP1D(UnaryPredicate1D):
def __init__(self, qi_start, qi_end):
UnaryPredicate1D.__init__(self)
self.__getQI = QuantitativeInvisibilityF1D()
self.__qi_start = qi_start
self.__qi_end = qi_end
def getName(self):
return "QuantitativeInvisibilityRangeUP1D"
def __call__(self, inter):
qi = self.__getQI(inter)
return self.__qi_start <= qi <= self.__qi_end
def join_unary_predicates(upred_list, bpred):
if not upred_list:
return TrueUP1D()
upred = upred_list[0]
for p in upred_list[1:]:
upred = bpred(upred, p)
return upred
class ObjectNamesUP1D(UnaryPredicate1D):
def __init__(self, names, negative):
UnaryPredicate1D.__init__(self)
self._names = names
self._negative = negative
def getName(self):
return "ObjectNamesUP1D"
def __call__(self, viewEdge):
found = viewEdge.viewShape().getName() in self._names
if self._negative:
return not found
return found
class WithinImageBorderUP1D(UnaryPredicate1D):
def __init__(self, xmin, xmax, ymin, ymax):
UnaryPredicate1D.__init__(self)
self._xmin = xmin
self._xmax = xmax
self._ymin = ymin
self._ymax = ymax
def getName(self):
return "WithinImageBorderUP1D"
def __call__(self, inter):
return self.withinBorder(inter.A()) or self.withinBorder(inter.B())
def withinBorder(self, vert):
x = vert.getProjectedX()
y = vert.getProjectedY()
return self._xmin <= x <= self._xmax and self._ymin <= y <= self._ymax
# Stroke caps
def iter_stroke_vertices(stroke):
it = stroke.strokeVerticesBegin()
while not it.isEnd():
yield it.getObject()
it.increment()
class RoundCapShader(StrokeShader):
def round_cap_thickness(self, x):
x = max(0.0, min(x, 1.0))
return math.sqrt(1.0 - (x ** 2))
def shade(self, stroke):
# save the location and attribute of stroke vertices
buffer = []
for sv in iter_stroke_vertices(stroke):
buffer.append((sv.getPoint(), sv.attribute()))
# calculate the number of additional vertices to form caps
R, L = stroke[0].attribute().getThicknessRL()
caplen_beg = (R + L) / 2.0
nverts_beg = max(5, int(R + L))
R, L = stroke[-1].attribute().getThicknessRL()
caplen_end = (R + L) / 2.0
nverts_end = max(5, int(R + L))
# increase the total number of stroke vertices
nverts = stroke.strokeVerticesSize()
stroke.Resample(nverts + nverts_beg + nverts_end)
# restore the location and attribute of the original vertices
for i in range(nverts):
p, attr = buffer[i]
stroke[nverts_beg + i].setPoint(p)
stroke[nverts_beg + i].setAttribute(attr)
# reshape the cap at the beginning of the stroke
q, attr = buffer[1]
p, attr = buffer[0]
d = p - q
d = d / d.length * caplen_beg
n = 1.0 / nverts_beg
R, L = attr.getThicknessRL()
for i in range(nverts_beg):
t = (nverts_beg - i) * n
stroke[i].setPoint(p + d * t)
r = self.round_cap_thickness((nverts_beg - i + 1) * n)
stroke[i].setAttribute(attr)
stroke[i].attribute().setThickness(R * r, L * r)
# reshape the cap at the end of the stroke
q, attr = buffer[-2]
p, attr = buffer[-1]
d = p - q
d = d / d.length * caplen_end
n = 1.0 / nverts_end
R, L = attr.getThicknessRL()
for i in range(nverts_end):
t = (nverts_end - i) * n
stroke[-i-1].setPoint(p + d * t)
r = self.round_cap_thickness((nverts_end - i + 1) * n)
stroke[-i-1].setAttribute(attr)
stroke[-i-1].attribute().setThickness(R * r, L * r)
class SquareCapShader(StrokeShader):
def shade(self, stroke):
# save the location and attribute of stroke vertices
buffer = []
for sv in iter_stroke_vertices(stroke):
buffer.append((sv.getPoint(), sv.attribute()))
# calculate the number of additional vertices to form caps
R, L = stroke[0].attribute().getThicknessRL()
caplen_beg = (R + L) / 2.0
nverts_beg = 1
R, L = stroke[-1].attribute().getThicknessRL()
caplen_end = (R + L) / 2.0
nverts_end = 1
# increase the total number of stroke vertices
nverts = stroke.strokeVerticesSize()
stroke.Resample(nverts + nverts_beg + nverts_end)
# restore the location and attribute of the original vertices
for i in range(nverts):
p, attr = buffer[i]
stroke[nverts_beg + i].setPoint(p)
stroke[nverts_beg + i].setAttribute(attr)
# reshape the cap at the beginning of the stroke
q, attr = buffer[1]
p, attr = buffer[0]
d = p - q
stroke[0].setPoint(p + d / d.length * caplen_beg)
stroke[0].setAttribute(attr)
# reshape the cap at the end of the stroke
q, attr = buffer[-2]
p, attr = buffer[-1]
d = p - q
stroke[-1].setPoint(p + d / d.length * caplen_beg)
stroke[-1].setAttribute(attr)
# dashed line
class DashedLineStartingUP0D(UnaryPredicate0D):
def __init__(self, controller):
UnaryPredicate0D.__init__(self)
self._controller = controller
def __call__(self, inter):
return self._controller.start()
class DashedLineStoppingUP0D(UnaryPredicate0D):
def __init__(self, controller):
UnaryPredicate0D.__init__(self)
self._controller = controller
def __call__(self, inter):
return self._controller.stop()
class DashedLineController:
def __init__(self, pattern, sampling):
self.sampling = float(sampling)
k = len(pattern) // 2
n = k * 2
self.start_pos = [pattern[i] + pattern[i+1] for i in range(0, n, 2)]
self.stop_pos = [pattern[i] for i in range(0, n, 2)]
self.init()
def init(self):
self.start_len = 0.0
self.start_idx = 0
self.stop_len = self.sampling
self.stop_idx = 0
def start(self):
self.start_len += self.sampling
if abs(self.start_len - self.start_pos[self.start_idx]) < self.sampling / 2.0:
self.start_len = 0.0
self.start_idx = (self.start_idx + 1) % len(self.start_pos)
return True
return False
def stop(self):
if self.start_len > 0.0:
self.init()
self.stop_len += self.sampling
if abs(self.stop_len - self.stop_pos[self.stop_idx]) < self.sampling / 2.0:
self.stop_len = self.sampling
self.stop_idx = (self.stop_idx + 1) % len(self.stop_pos)
return True
return False
# predicates for chaining
class AngleLargerThanBP1D(BinaryPredicate1D):
def __init__(self, angle):
BinaryPredicate1D.__init__(self)
self._angle = math.pi * angle / 180.0
def getName(self):
return "AngleLargerThanBP1D"
def __call__(self, i1, i2):
fe1a = i1.fedgeA()
fe1b = i1.fedgeB()
fe2a = i2.fedgeA()
fe2b = i2.fedgeB()
sv1a = fe1a.vertexA().getPoint2D()
sv1b = fe1b.vertexB().getPoint2D()
sv2a = fe2a.vertexA().getPoint2D()
sv2b = fe2b.vertexB().getPoint2D()
if (sv1a - sv2a).length < 1e-6:
dir1 = sv1a - sv1b
dir2 = sv2b - sv2a
elif (sv1b - sv2b).length < 1e-6:
dir1 = sv1b - sv1a
dir2 = sv2a - sv2b
elif (sv1a - sv2b).length < 1e-6:
dir1 = sv1a - sv1b
dir2 = sv2a - sv2b
elif (sv1b - sv2a).length < 1e-6:
dir1 = sv1b - sv1a
dir2 = sv2b - sv2a
else:
return False
denom = dir1.length * dir2.length
if denom < 1e-6:
return False
x = (dir1 * dir2) / denom
return math.acos(min(max(x, -1.0), 1.0)) > self._angle
class AndBP1D(BinaryPredicate1D):
def __init__(self, pred1, pred2):
BinaryPredicate1D.__init__(self)
self.__pred1 = pred1
self.__pred2 = pred2
def getName(self):
return "AndBP1D"
def __call__(self, i1, i2):
return self.__pred1(i1, i2) and self.__pred2(i1, i2)
# main function for parameter processing
def process(layer_name, lineset_name):
scene = Freestyle.getCurrentScene()
layer = scene.render.layers[layer_name]
lineset = layer.freestyle_settings.linesets[lineset_name]
linestyle = lineset.linestyle
selection_criteria = []
# prepare selection criteria by visibility
if lineset.select_by_visibility:
if lineset.visibility == "VISIBLE":
selection_criteria.append(
QuantitativeInvisibilityUP1D(0))
elif lineset.visibility == "HIDDEN":
selection_criteria.append(
NotUP1D(QuantitativeInvisibilityUP1D(0)))
elif lineset.visibility == "RANGE":
selection_criteria.append(
QuantitativeInvisibilityRangeUP1D(lineset.qi_start, lineset.qi_end))
# prepare selection criteria by edge types
if lineset.select_by_edge_types:
edge_type_criteria = []
if lineset.edge_type_combination == "OR":
flags = Nature.NO_FEATURE
if lineset.select_silhouette:
flags |= Nature.SILHOUETTE
if lineset.select_border:
flags |= Nature.BORDER
if lineset.select_crease:
flags |= Nature.CREASE
if lineset.select_ridge:
flags |= Nature.RIDGE
if lineset.select_valley:
flags |= Nature.VALLEY
if lineset.select_suggestive_contour:
flags |= Nature.SUGGESTIVE_CONTOUR
if lineset.select_material_boundary:
flags |= Nature.MATERIAL_BOUNDARY
if flags != Nature.NO_FEATURE:
edge_type_criteria.append(pyNatureUP1D(flags))
else:
if lineset.select_silhouette:
edge_type_criteria.append(pyNatureUP1D(Nature.SILHOUETTE))
if lineset.select_border:
edge_type_criteria.append(pyNatureUP1D(Nature.BORDER))
if lineset.select_crease:
edge_type_criteria.append(pyNatureUP1D(Nature.CREASE))
if lineset.select_ridge:
edge_type_criteria.append(pyNatureUP1D(Nature.RIDGE))
if lineset.select_valley:
edge_type_criteria.append(pyNatureUP1D(Nature.VALLEY))
if lineset.select_suggestive_contour:
edge_type_criteria.append(pyNatureUP1D(Nature.SUGGESTIVE_CONTOUR))
if lineset.select_material_boundary:
edge_type_criteria.append(pyNatureUP1D(Nature.MATERIAL_BOUNDARY))
if lineset.select_contour:
edge_type_criteria.append(ContourUP1D())
if lineset.select_external_contour:
edge_type_criteria.append(ExternalContourUP1D())
if lineset.edge_type_combination == "OR":
upred = join_unary_predicates(edge_type_criteria, OrUP1D)
else:
upred = join_unary_predicates(edge_type_criteria, AndUP1D)
if upred is not None:
if lineset.edge_type_negation == "EXCLUSIVE":
upred = NotUP1D(upred)
selection_criteria.append(upred)
# prepare selection criteria by group of objects
if lineset.select_by_group:
if lineset.group is not None and len(lineset.group.objects) > 0:
names = dict((ob.name, True) for ob in lineset.group.objects)
upred = ObjectNamesUP1D(names, lineset.group_negation == 'EXCLUSIVE')
selection_criteria.append(upred)
# prepare selection criteria by image border
if lineset.select_by_image_border:
w = scene.render.resolution_x
h = scene.render.resolution_y
if scene.render.use_border:
xmin = scene.render.border_min_x * w
xmax = scene.render.border_max_x * w
ymin = scene.render.border_min_y * h
ymax = scene.render.border_max_y * h
else:
xmin, xmax = 0.0, float(w)
ymin, ymax = 0.0, float(h)
upred = WithinImageBorderUP1D(xmin, xmax, ymin, ymax)
selection_criteria.append(upred)
# do feature edge selection
upred = join_unary_predicates(selection_criteria, AndUP1D)
if upred is None:
upred = TrueUP1D()
Operators.select(upred)
# join feature edges
bpred = AngleLargerThanBP1D(1.0) # XXX temporary fix for occasional unexpected long lines
if linestyle.same_object:
bpred = AndBP1D(bpred, SameShapeIdBP1D())
Operators.bidirectionalChain(ChainPredicateIterator(upred, bpred), NotUP1D(upred))
# dashed line
if linestyle.use_dashed_line:
pattern = []
if linestyle.dash1 > 0 and linestyle.gap1 > 0:
pattern.append(linestyle.dash1)
pattern.append(linestyle.gap1)
if linestyle.dash2 > 0 and linestyle.gap2 > 0:
pattern.append(linestyle.dash2)
pattern.append(linestyle.gap2)
if linestyle.dash3 > 0 and linestyle.gap3 > 0:
pattern.append(linestyle.dash3)
pattern.append(linestyle.gap3)
if len(pattern) > 0:
sampling = 1.0
controller = DashedLineController(pattern, sampling)
Operators.sequentialSplit(DashedLineStartingUP0D(controller),
DashedLineStoppingUP0D(controller),
sampling)
# prepare a list of stroke shaders
color = linestyle.color
shaders_list = [
SamplingShader(5.0),
ConstantThicknessShader(linestyle.thickness),
ConstantColorShader(color.r, color.g, color.b, linestyle.alpha)]
for m in linestyle.color_modifiers:
if not m.use:
continue
if m.type == "ALONG_STROKE":
shaders_list.append(ColorAlongStrokeShader(
m.blend, m.influence, m.color_ramp))
elif m.type == "DISTANCE_FROM_CAMERA":
shaders_list.append(ColorDistanceFromCameraShader(
m.blend, m.influence, m.color_ramp,
m.range_min, m.range_max))
elif m.type == "DISTANCE_FROM_OBJECT":
shaders_list.append(ColorDistanceFromObjectShader(
m.blend, m.influence, m.color_ramp, m.target,
m.range_min, m.range_max))
for m in linestyle.alpha_modifiers:
if not m.use:
continue
if m.type == "ALONG_STROKE":
shaders_list.append(AlphaAlongStrokeShader(
m.blend, m.influence, m.mapping, m.invert, m.curve))
elif m.type == "DISTANCE_FROM_CAMERA":
shaders_list.append(AlphaDistanceFromCameraShader(
m.blend, m.influence, m.mapping, m.invert, m.curve,
m.range_min, m.range_max))
elif m.type == "DISTANCE_FROM_OBJECT":
shaders_list.append(AlphaDistanceFromObjectShader(
m.blend, m.influence, m.mapping, m.invert, m.curve, m.target,
m.range_min, m.range_max))
for m in linestyle.thickness_modifiers:
if not m.use:
continue
if m.type == "ALONG_STROKE":
shaders_list.append(ThicknessAlongStrokeShader(
m.blend, m.influence, m.mapping, m.invert, m.curve,
m.value_min, m.value_max))
elif m.type == "DISTANCE_FROM_CAMERA":
shaders_list.append(ThicknessDistanceFromCameraShader(
m.blend, m.influence, m.mapping, m.invert, m.curve,
m.range_min, m.range_max, m.value_min, m.value_max))
elif m.type == "DISTANCE_FROM_OBJECT":
shaders_list.append(ThicknessDistanceFromObjectShader(
m.blend, m.influence, m.mapping, m.invert, m.curve, m.target,
m.range_min, m.range_max, m.value_min, m.value_max))
if linestyle.caps == "ROUND":
shaders_list.append(RoundCapShader())
elif linestyle.caps == "SQUARE":
shaders_list.append(SquareCapShader())
# create strokes using the shaders list
Operators.create(TrueUP1D(), shaders_list)
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