719 lines
22 KiB
Python
719 lines
22 KiB
Python
# SPDX-License-Identifier: GPL-2.0-or-later
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bl_info = {
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"name": "Simplify Curves+",
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"author": "testscreenings, Michael Soluyanov",
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"version": (1, 1, 2),
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"blender": (2, 80, 0),
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"location": "3D View, Dopesheet & Graph Editors",
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"description": "Simplify Curves: 3dview, Dopesheet, Graph. Distance Merge: 3d view curve edit",
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"warning": "",
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"doc_url": "{BLENDER_MANUAL_URL}/addons/add_curve/simplify_curves.html",
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"category": "Add Curve",
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}
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"""
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This script simplifies Curve objects and animation F-Curves
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This script will also Merge by Distance 3d view curves in edit mode
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"""
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import bpy
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from bpy.props import (
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BoolProperty,
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EnumProperty,
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FloatProperty,
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IntProperty,
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)
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import mathutils
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from math import (
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sin,
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pow,
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)
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from bpy.types import Operator
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def error_handlers(self, op_name, errors, reports="ERROR"):
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if self and reports:
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self.report({'INFO'},
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reports + ": some operations could not be performed "
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"(See Console for more info)")
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print("\n[Simplify Curves]\nOperator: {}\nErrors: {}\n".format(op_name, errors))
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# Check for curve
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# ### simplipoly algorithm ###
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# get SplineVertIndices to keep
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def simplypoly(splineVerts, options):
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# main vars
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newVerts = [] # list of vertindices to keep
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points = splineVerts # list of 3dVectors
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pointCurva = [] # table with curvatures
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curvatures = [] # averaged curvatures per vert
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for p in points:
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pointCurva.append([])
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order = options[3] # order of sliding beziercurves
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k_thresh = options[2] # curvature threshold
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dis_error = options[6] # additional distance error
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# get curvatures per vert
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for i, point in enumerate(points[: -(order - 1)]):
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BVerts = points[i: i + order]
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for b, BVert in enumerate(BVerts[1: -1]):
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deriv1 = getDerivative(BVerts, 1 / (order - 1), order - 1)
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deriv2 = getDerivative(BVerts, 1 / (order - 1), order - 2)
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curva = getCurvature(deriv1, deriv2)
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pointCurva[i + b + 1].append(curva)
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# average the curvatures
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for i in range(len(points)):
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avgCurva = sum(pointCurva[i]) / (order - 1)
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curvatures.append(avgCurva)
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# get distancevalues per vert - same as Ramer-Douglas-Peucker
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# but for every vert
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distances = [0.0] # first vert is always kept
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for i, point in enumerate(points[1: -1]):
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dist = altitude(points[i], points[i + 2], points[i + 1])
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distances.append(dist)
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distances.append(0.0) # last vert is always kept
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# generate list of vert indices to keep
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# tested against averaged curvatures and distances of neighbour verts
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newVerts.append(0) # first vert is always kept
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for i, curv in enumerate(curvatures):
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if (curv >= k_thresh * 0.01 or distances[i] >= dis_error * 0.1):
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newVerts.append(i)
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newVerts.append(len(curvatures) - 1) # last vert is always kept
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return newVerts
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# get binomial coefficient
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def binom(n, m):
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b = [0] * (n + 1)
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b[0] = 1
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for i in range(1, n + 1):
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b[i] = 1
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j = i - 1
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while j > 0:
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b[j] += b[j - 1]
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j -= 1
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return b[m]
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# get nth derivative of order(len(verts)) bezier curve
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def getDerivative(verts, t, nth):
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order = len(verts) - 1 - nth
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QVerts = []
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if nth:
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for i in range(nth):
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if QVerts:
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verts = QVerts
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derivVerts = []
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for i in range(len(verts) - 1):
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derivVerts.append(verts[i + 1] - verts[i])
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QVerts = derivVerts
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else:
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QVerts = verts
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if len(verts[0]) == 3:
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point = Vector((0, 0, 0))
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if len(verts[0]) == 2:
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point = Vector((0, 0))
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for i, vert in enumerate(QVerts):
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point += binom(order, i) * pow(t, i) * pow(1 - t, order - i) * vert
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deriv = point
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return deriv
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# get curvature from first, second derivative
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def getCurvature(deriv1, deriv2):
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if deriv1.length == 0: # in case of points in straight line
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curvature = 0
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return curvature
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curvature = (deriv1.cross(deriv2)).length / pow(deriv1.length, 3)
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return curvature
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# ### Ramer-Douglas-Peucker algorithm ###
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# get altitude of vert
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def altitude(point1, point2, pointn):
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edge1 = point2 - point1
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edge2 = pointn - point1
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if edge2.length == 0:
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altitude = 0
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return altitude
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if edge1.length == 0:
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altitude = edge2.length
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return altitude
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alpha = edge1.angle(edge2)
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altitude = sin(alpha) * edge2.length
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return altitude
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# iterate through verts
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def iterate(points, newVerts, error):
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new = []
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for newIndex in range(len(newVerts) - 1):
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bigVert = 0
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alti_store = 0
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for i, point in enumerate(points[newVerts[newIndex] + 1: newVerts[newIndex + 1]]):
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alti = altitude(points[newVerts[newIndex]], points[newVerts[newIndex + 1]], point)
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if alti > alti_store:
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alti_store = alti
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if alti_store >= error:
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bigVert = i + 1 + newVerts[newIndex]
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if bigVert:
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new.append(bigVert)
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if new == []:
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return False
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return new
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# get SplineVertIndices to keep
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def simplify_RDP(splineVerts, options):
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# main vars
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error = options[4]
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# set first and last vert
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newVerts = [0, len(splineVerts) - 1]
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# iterate through the points
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new = 1
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while new is not False:
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new = iterate(splineVerts, newVerts, error)
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if new:
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newVerts += new
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newVerts.sort()
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return newVerts
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# ### CURVE GENERATION ###
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# set bezierhandles to auto
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def setBezierHandles(newCurve):
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# Faster:
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for spline in newCurve.data.splines:
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for p in spline.bezier_points:
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p.handle_left_type = 'AUTO'
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p.handle_right_type = 'AUTO'
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# get array of new coords for new spline from vertindices
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def vertsToPoints(newVerts, splineVerts, splineType):
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# main vars
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newPoints = []
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# array for BEZIER spline output
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if splineType == 'BEZIER':
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for v in newVerts:
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newPoints += splineVerts[v].to_tuple()
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# array for nonBEZIER output
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else:
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for v in newVerts:
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newPoints += (splineVerts[v].to_tuple())
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if splineType == 'NURBS':
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newPoints.append(1) # for nurbs w = 1
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else: # for poly w = 0
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newPoints.append(0)
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return newPoints
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# ### MAIN OPERATIONS ###
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def main(context, obj, options, curve_dimension):
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mode = options[0]
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output = options[1]
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degreeOut = options[5]
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keepShort = options[7]
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bpy.ops.object.select_all(action='DESELECT')
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scene = context.scene
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splines = obj.data.splines.values()
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# create curvedatablock
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curve = bpy.data.curves.new("Simple_" + obj.name, type='CURVE')
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curve.dimensions = curve_dimension
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# go through splines
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for spline_i, spline in enumerate(splines):
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# test if spline is a long enough
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if len(spline.points) >= 3 or keepShort:
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# check what type of spline to create
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if output == 'INPUT':
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splineType = spline.type
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else:
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splineType = output
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# get vec3 list to simplify
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if spline.type == 'BEZIER': # get bezierverts
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splineVerts = [splineVert.co.copy()
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for splineVert in spline.bezier_points.values()]
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else: # verts from all other types of curves
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splineVerts = [splineVert.co.to_3d()
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for splineVert in spline.points.values()]
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# simplify spline according to mode
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if mode == 'DISTANCE':
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newVerts = simplify_RDP(splineVerts, options)
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if mode == 'CURVATURE':
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newVerts = simplypoly(splineVerts, options)
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# convert indices into vectors3D
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newPoints = vertsToPoints(newVerts, splineVerts, splineType)
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# create new spline
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newSpline = curve.splines.new(type=splineType)
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# put newPoints into spline according to type
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if splineType == 'BEZIER':
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newSpline.bezier_points.add(int(len(newPoints) * 0.33))
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newSpline.bezier_points.foreach_set('co', newPoints)
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else:
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newSpline.points.add(int(len(newPoints) * 0.25 - 1))
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newSpline.points.foreach_set('co', newPoints)
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# set degree of outputNurbsCurve
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if output == 'NURBS':
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newSpline.order_u = degreeOut
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# splineoptions
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newSpline.use_endpoint_u = spline.use_endpoint_u
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# create new object and put into scene
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newCurve = bpy.data.objects.new("Simple_" + obj.name, curve)
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coll = context.view_layer.active_layer_collection.collection
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coll.objects.link(newCurve)
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newCurve.select_set(True)
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context.view_layer.objects.active = newCurve
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newCurve.matrix_world = obj.matrix_world
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# set bezierhandles to auto
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setBezierHandles(newCurve)
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return
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# get preoperator fcurves
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def getFcurveData(obj):
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fcurves = []
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for fc in obj.animation_data.action.fcurves:
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if fc.select:
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fcVerts = [vcVert.co.to_3d()
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for vcVert in fc.keyframe_points.values()]
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fcurves.append(fcVerts)
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return fcurves
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def selectedfcurves(obj):
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fcurves_sel = []
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for i, fc in enumerate(obj.animation_data.action.fcurves):
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if fc.select:
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fcurves_sel.append(fc)
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return fcurves_sel
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# fCurves Main
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def fcurves_simplify(context, obj, options, fcurves):
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# main vars
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mode = options[0]
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# get indices of selected fcurves
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fcurve_sel = selectedfcurves(obj)
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# go through fcurves
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for fcurve_i, fcurve in enumerate(fcurves):
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# test if fcurve is long enough
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if len(fcurve) >= 3:
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# simplify spline according to mode
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if mode == 'DISTANCE':
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newVerts = simplify_RDP(fcurve, options)
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if mode == 'CURVATURE':
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newVerts = simplypoly(fcurve, options)
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# convert indices into vectors3D
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newPoints = []
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# this is different from the main() function for normal curves, different api...
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for v in newVerts:
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newPoints.append(fcurve[v])
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# remove all points from curve first
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for i in range(len(fcurve) - 1, 0, -1):
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fcurve_sel[fcurve_i].keyframe_points.remove(fcurve_sel[fcurve_i].keyframe_points[i])
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# put newPoints into fcurve
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for v in newPoints:
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fcurve_sel[fcurve_i].keyframe_points.insert(frame=v[0], value=v[1])
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return
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# ### MENU append ###
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def menu_func(self, context):
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self.layout.operator("graph.simplify")
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def menu(self, context):
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self.layout.operator("curve.simplify", text="Curve Simplify", icon="CURVE_DATA")
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# ### ANIMATION CURVES OPERATOR ###
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class GRAPH_OT_simplify(Operator):
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bl_idname = "graph.simplify"
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bl_label = "Simplify F-Curves"
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bl_description = ("Simplify selected Curves\n"
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"Does not operate on short Splines (less than 3 points)")
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bl_options = {'REGISTER', 'UNDO'}
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# Properties
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opModes = [
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('DISTANCE', 'Distance', 'Distance-based simplification (Poly)'),
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('CURVATURE', 'Curvature', 'Curvature-based simplification (RDP)')]
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mode: EnumProperty(
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name="Mode",
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description="Choose algorithm to use",
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items=opModes
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)
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k_thresh: FloatProperty(
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name="k",
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min=0, soft_min=0,
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default=0, precision=5,
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description="Threshold"
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)
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pointsNr: IntProperty(
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name="n",
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min=5, soft_min=5,
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max=16, soft_max=9,
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default=5,
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description="Degree of curve to get averaged curvatures"
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)
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error: FloatProperty(
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name="Error",
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description="Maximum allowed distance error",
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min=0.0, soft_min=0.0,
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default=0, precision=5,
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step = 0.1
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)
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degreeOut: IntProperty(
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name="Degree",
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min=3, soft_min=3,
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max=7, soft_max=7,
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default=5,
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description="Degree of new curve"
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)
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dis_error: FloatProperty(
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name="Distance error",
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description="Maximum allowed distance error in Blender Units",
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min=0, soft_min=0,
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default=0.0, precision=5
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)
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fcurves = []
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def draw(self, context):
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layout = self.layout
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col = layout.column()
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col.label(text="Distance Error:")
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col.prop(self, "error", expand=True)
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@classmethod
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def poll(cls, context):
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# Check for animdata
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obj = context.active_object
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fcurves = False
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if obj:
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animdata = obj.animation_data
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if animdata:
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act = animdata.action
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if act:
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fcurves = act.fcurves
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return (obj and fcurves)
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def execute(self, context):
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options = [
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self.mode, # 0
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self.mode, # 1
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self.k_thresh, # 2
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self.pointsNr, # 3
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self.error, # 4
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self.degreeOut, # 6
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self.dis_error # 7
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]
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obj = context.active_object
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if not self.fcurves:
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self.fcurves = getFcurveData(obj)
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fcurves_simplify(context, obj, options, self.fcurves)
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return {'FINISHED'}
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# ### Curves OPERATOR ###
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class CURVE_OT_simplify(Operator):
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bl_idname = "curve.simplify"
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bl_label = "Simplify Curves"
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bl_description = ("Simplify the existing Curve based upon the chosen settings\n"
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"Notes: Needs an existing Curve object,\n"
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"Outputs a new Curve with the Simple prefix in the name")
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bl_options = {'REGISTER', 'UNDO'}
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# Properties
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opModes = [
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('DISTANCE', 'Distance', 'Distance-based simplification (Poly)'),
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('CURVATURE', 'Curvature', 'Curvature-based simplification (RDP)')
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]
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mode: EnumProperty(
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name="Mode",
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description="Choose algorithm to use",
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items=opModes
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)
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SplineTypes = [
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('INPUT', 'Input', 'Same type as input spline'),
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('NURBS', 'Nurbs', 'NURBS'),
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('BEZIER', 'Bezier', 'BEZIER'),
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('POLY', 'Poly', 'POLY')
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]
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output: EnumProperty(
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name="Output splines",
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description="Type of splines to output",
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items=SplineTypes
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)
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k_thresh: FloatProperty(
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name="k",
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min=0, soft_min=0,
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default=0, precision=5,
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description="Threshold"
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)
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pointsNr: IntProperty(
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name="n",
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min=5, soft_min=5,
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max=9, soft_max=9,
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default=5,
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description="Degree of curve to get averaged curvatures"
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)
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error: FloatProperty(
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name="Error",
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description="Maximum allowed distance error in Blender Units",
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min=0, soft_min=0,
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default=0.0, precision=5,
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step = 0.1
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)
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degreeOut: IntProperty(
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name="Degree",
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min=3, soft_min=3,
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max=7, soft_max=7,
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default=5,
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description="Degree of new curve"
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)
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dis_error: FloatProperty(
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name="Distance error",
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description="Maximum allowed distance error in Blender Units",
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min=0, soft_min=0,
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default=0.0
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)
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keepShort: BoolProperty(
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name="Keep short splines",
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description="Keep short splines (less than 3 points)",
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default=True
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)
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def draw(self, context):
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layout = self.layout
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col = layout.column()
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col.label(text="Distance Error:")
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col.prop(self, "error", expand=True)
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col.prop(self, "output", text="Output", icon="OUTLINER_OB_CURVE")
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|
if self.output == "NURBS":
|
|
col.prop(self, "degreeOut", expand=True)
|
|
col.separator()
|
|
col.prop(self, "keepShort", expand=True)
|
|
|
|
@classmethod
|
|
def poll(cls, context):
|
|
obj = context.active_object
|
|
return (obj and obj.type == 'CURVE')
|
|
|
|
def execute(self, context):
|
|
options = [
|
|
self.mode, # 0
|
|
self.output, # 1
|
|
self.k_thresh, # 2
|
|
self.pointsNr, # 3
|
|
self.error, # 4
|
|
self.degreeOut, # 5
|
|
self.dis_error, # 6
|
|
self.keepShort # 7
|
|
]
|
|
try:
|
|
bpy.ops.object.mode_set(mode='OBJECT')
|
|
obj = context.active_object
|
|
curve_dimension = obj.data.dimensions
|
|
|
|
main(context, obj, options, curve_dimension)
|
|
except Exception as e:
|
|
error_handlers(self, "curve.simplify", e, "Simplify Curves")
|
|
return {'CANCELLED'}
|
|
|
|
return {'FINISHED'}
|
|
|
|
## Initial use Curve Remove Doubles ##
|
|
|
|
def main_rd(context, distance = 0.01):
|
|
|
|
selected_Curves = context.selected_objects
|
|
if bpy.ops.object.mode_set.poll():
|
|
bpy.ops.object.mode_set(mode='EDIT')
|
|
|
|
bezier_dellist = []
|
|
dellist = []
|
|
|
|
for curve in selected_Curves:
|
|
for spline in curve.data.splines:
|
|
if spline.type == 'BEZIER':
|
|
if len(spline.bezier_points) > 1:
|
|
for i in range(0, len(spline.bezier_points)):
|
|
|
|
if i == 0:
|
|
ii = len(spline.bezier_points) - 1
|
|
else:
|
|
ii = i - 1
|
|
|
|
dot = spline.bezier_points[i];
|
|
dot1 = spline.bezier_points[ii];
|
|
|
|
while dot1 in bezier_dellist and i != ii:
|
|
ii -= 1
|
|
if ii < 0:
|
|
ii = len(spline.bezier_points)-1
|
|
dot1 = spline.bezier_points[ii]
|
|
|
|
if dot.select_control_point and dot1.select_control_point and (i!=0 or spline.use_cyclic_u):
|
|
|
|
if (dot.co-dot1.co).length < distance:
|
|
# remove points and recreate hangles
|
|
dot1.handle_right_type = "FREE"
|
|
dot1.handle_right = dot.handle_right
|
|
dot1.co = (dot.co + dot1.co) / 2
|
|
bezier_dellist.append(dot)
|
|
|
|
else:
|
|
# Handles that are on main point position converts to vector,
|
|
# if next handle are also vector
|
|
if dot.handle_left_type == 'VECTOR' and (dot1.handle_right - dot1.co).length < distance:
|
|
dot1.handle_right_type = "VECTOR"
|
|
if dot1.handle_right_type == 'VECTOR' and (dot.handle_left - dot.co).length < distance:
|
|
dot.handle_left_type = "VECTOR"
|
|
else:
|
|
if len(spline.points) > 1:
|
|
for i in range(0, len(spline.points)):
|
|
|
|
if i == 0:
|
|
ii = len(spline.points) - 1
|
|
else:
|
|
ii = i - 1
|
|
|
|
dot = spline.points[i];
|
|
dot1 = spline.points[ii];
|
|
|
|
while dot1 in dellist and i != ii:
|
|
ii -= 1
|
|
if ii < 0:
|
|
ii = len(spline.points)-1
|
|
dot1 = spline.points[ii]
|
|
|
|
if dot.select and dot1.select and (i!=0 or spline.use_cyclic_u):
|
|
|
|
if (dot.co-dot1.co).length < distance:
|
|
dot1.co = (dot.co + dot1.co) / 2
|
|
dellist.append(dot)
|
|
|
|
bpy.ops.curve.select_all(action = 'DESELECT')
|
|
|
|
for dot in bezier_dellist:
|
|
dot.select_control_point = True
|
|
|
|
for dot in dellist:
|
|
dot.select = True
|
|
|
|
bezier_count = len(bezier_dellist)
|
|
count = len(dellist)
|
|
|
|
bpy.ops.curve.delete(type = 'VERT')
|
|
|
|
bpy.ops.curve.select_all(action = 'DESELECT')
|
|
|
|
return bezier_count + count
|
|
|
|
|
|
|
|
class Curve_OT_CurveRemvDbs(bpy.types.Operator):
|
|
"""Merge consecutive points that are near to each other"""
|
|
bl_idname = 'curve.remove_double'
|
|
bl_label = 'Merge By Distance'
|
|
bl_options = {'REGISTER', 'UNDO'}
|
|
|
|
distance: bpy.props.FloatProperty(name = 'Distance', default = 0.01, soft_min = 0.001, step = 0.1)
|
|
|
|
@classmethod
|
|
def poll(cls, context):
|
|
obj = context.active_object
|
|
return (obj and obj.type == 'CURVE')
|
|
|
|
def execute(self, context):
|
|
removed=main_rd(context, self.distance)
|
|
self.report({'INFO'}, "Removed %d bezier points" % removed)
|
|
return {'FINISHED'}
|
|
|
|
def menu_func_rd(self, context):
|
|
self.layout.operator(Curve_OT_CurveRemvDbs.bl_idname, text='Merge By Distance')
|
|
|
|
# Register
|
|
classes = [
|
|
GRAPH_OT_simplify,
|
|
CURVE_OT_simplify,
|
|
Curve_OT_CurveRemvDbs,
|
|
]
|
|
|
|
|
|
def register():
|
|
from bpy.utils import register_class
|
|
for cls in classes:
|
|
register_class(cls)
|
|
|
|
#bpy.types.GRAPH_MT_channel.append(menu_func)
|
|
#bpy.types.DOPESHEET_MT_channel.append(menu_func)
|
|
bpy.types.VIEW3D_MT_curve_add.append(menu)
|
|
bpy.types.VIEW3D_MT_edit_curve_context_menu.prepend(menu)
|
|
bpy.types.VIEW3D_MT_edit_curve_context_menu.prepend(menu_func_rd)
|
|
|
|
|
|
def unregister():
|
|
from bpy.utils import unregister_class
|
|
for cls in reversed(classes):
|
|
unregister_class(cls)
|
|
|
|
#bpy.types.GRAPH_MT_channel.remove(menu_func)
|
|
#bpy.types.DOPESHEET_MT_channel.remove(menu_func)
|
|
bpy.types.VIEW3D_MT_curve_add.remove(menu)
|
|
bpy.types.VIEW3D_MT_edit_curve_context_menu.remove(menu)
|
|
bpy.types.VIEW3D_MT_edit_curve_context_menu.remove(menu_func_rd)
|
|
|
|
if __name__ == "__main__":
|
|
register()
|