forked from bartvdbraak/blender
First commit of mocap_tools.py, contains functions for Fcurve simplification and loop detection of anims
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release/scripts/modules/mocap_tools.py
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451
release/scripts/modules/mocap_tools.py
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from math import hypot, sqrt, isfinite
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import bpy
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import time
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from mathutils import Vector
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#Vector utility functions
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class NdVector:
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vec = []
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def __init__(self,vec):
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self.vec = vec[:]
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def __len__(self):
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return len(self.vec)
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def __mul__(self,otherMember):
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if type(otherMember)==type(1) or type(otherMember)==type(1.0):
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return NdVector([otherMember*x for x in self.vec])
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else:
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a = self.vec
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b = otherMember.vec
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n = len(self)
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return sum([a[i]*b[i] for i in range(n)])
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def __sub__(self,otherVec):
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a = self.vec
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b = otherVec.vec
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n = len(self)
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return NdVector([a[i]-b[i] for i in range(n)])
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def __add__(self,otherVec):
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a = self.vec
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b = otherVec.vec
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n = len(self)
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return NdVector([a[i]+b[i] for i in range(n)])
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def vecLength(self):
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return sqrt(self * self)
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def vecLengthSq(self):
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return (self * self)
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def __getitem__(self,i):
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return self.vec[i]
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length = property(vecLength)
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lengthSq = property(vecLengthSq)
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class dataPoint:
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index = 0
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co = Vector((0,0,0,0)) # x,y1,y2,y3 coordinate of original point
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u = 0 #position according to parametric view of original data, [0,1] range
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temp = 0 #use this for anything
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def __init__(self,index,co,u=0):
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self.index = index
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self.co = co
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self.u = u
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def autoloop_anim():
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context = bpy.context
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obj = context.active_object
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fcurves = [x for x in obj.animation_data.action.fcurves if x.select]
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data = []
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end = len(fcurves[0].keyframe_points)
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for i in range(1,end):
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vec = []
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for fcurve in fcurves:
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vec.append(fcurve.evaluate(i))
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data.append(NdVector(vec))
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def comp(a,b):
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return a*b
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N = len(data)
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Rxy = [0.0] * N
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for i in range(N):
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for j in range(i,min(i+N,N)):
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Rxy[i]+=comp(data[j],data[j-i])
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for j in range(i):
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Rxy[i]+=comp(data[j],data[j-i+N])
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Rxy[i]/=float(N)
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def bestLocalMaximum(Rxy):
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Rxyd = [Rxy[i]-Rxy[i-1] for i in range(1,len(Rxy))]
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maxs = []
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for i in range(1,len(Rxyd)-1):
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a = Rxyd[i-1]
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b = Rxyd[i]
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print(a,b)
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if (a>=0 and b<0) or (a<0 and b>=0): #sign change (zerocrossing) at point i, denoting max point (only)
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maxs.append((i,max(Rxy[i],Rxy[i-1])))
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return max(maxs,key=lambda x: x[1])[0]
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flm = bestLocalMaximum(Rxy[0:int(len(Rxy))])
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diff = []
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for i in range(len(data)-flm):
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diff.append((data[i]-data[i+flm]).lengthSq)
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def lowerErrorSlice(diff,e):
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bestSlice = (0,100000) #index, error at index
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for i in range(e,len(diff)-e):
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errorSlice = sum(diff[i-e:i+e+1])
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if errorSlice<bestSlice[1]:
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bestSlice = (i,errorSlice)
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return bestSlice[0]
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margin = 2
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s = lowerErrorSlice(diff,margin)
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print(flm,s)
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loop = data[s:s+flm+margin]
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#find *all* loops, s:s+flm, s+flm:s+2flm, etc... and interpolate between all
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# to find "the perfect loop". Maybe before finding s? interp(i,i+flm,i+2flm)....
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for i in range(1,margin+1):
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w1 = sqrt(float(i)/margin)
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loop[-i] = (loop[-i]*w1)+(loop[0]*(1-w1))
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for curve in fcurves:
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pts = curve.keyframe_points
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for i in range(len(pts)-1,-1,-1):
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pts.remove(pts[i])
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for c,curve in enumerate(fcurves):
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pts = curve.keyframe_points
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for i in range(len(loop)):
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pts.insert(i+1,loop[i][c])
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context.scene.frame_end = flm+1
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def simplifyCurves(curveGroup, error, reparaError, maxIterations, group_mode):
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def unitTangent(v,data_pts):
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tang = Vector((0,0,0,0)) #
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if v!=0:
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#If it's not the first point, we can calculate a leftside tangent
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tang+= data_pts[v].co-data_pts[v-1].co
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if v!=len(data_pts)-1:
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#If it's not the last point, we can calculate a rightside tangent
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tang+= data_pts[v+1].co-data_pts[v].co
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tang.normalize()
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return tang
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#assign parametric u value for each point in original data
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def chordLength(data_pts,s,e):
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totalLength = 0
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for pt in data_pts[s:e+1]:
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i = pt.index
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if i==s:
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chordLength = 0
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else:
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chordLength = (data_pts[i].co-data_pts[i-1].co).length
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totalLength+= chordLength
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pt.temp = totalLength
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for pt in data_pts[s:e+1]:
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if totalLength==0:
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print(s,e)
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pt.u = (pt.temp/totalLength)
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# get binomial coefficient, this function/table is only called with args (3,0),(3,1),(3,2),(3,3),(2,0),(2,1),(2,2)!
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binomDict = {(3,0): 1, (3,1): 3, (3,2): 3, (3,3): 1, (2,0): 1, (2,1): 2, (2,2): 1}
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#value at pt t of a single bernstein Polynomial
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def bernsteinPoly(n,i,t):
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binomCoeff = binomDict[(n,i)]
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return binomCoeff * pow(t,i) * pow(1-t,n-i)
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# fit a single cubic to data points in range [s(tart),e(nd)].
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def fitSingleCubic(data_pts,s,e):
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# A - matrix used for calculating C matrices for fitting
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def A(i,j,s,e,t1,t2):
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if j==1:
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t = t1
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if j==2:
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t = t2
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u = data_pts[i].u
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return t * bernsteinPoly(3,j,u)
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# X component, used for calculating X matrices for fitting
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def xComponent(i,s,e):
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di = data_pts[i].co
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u = data_pts[i].u
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v0 = data_pts[s].co
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v3 = data_pts[e].co
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a = v0*bernsteinPoly(3,0,u)
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b = v0*bernsteinPoly(3,1,u) #
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c = v3*bernsteinPoly(3,2,u)
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d = v3*bernsteinPoly(3,3,u)
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return (di -(a+b+c+d))
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t1 = unitTangent(s,data_pts)
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t2 = unitTangent(e,data_pts)
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c11 = sum([A(i,1,s,e,t1,t2)*A(i,1,s,e,t1,t2) for i in range(s,e+1)])
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c12 = sum([A(i,1,s,e,t1,t2)*A(i,2,s,e,t1,t2) for i in range(s,e+1)])
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c21 = c12
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c22 = sum([A(i,2,s,e,t1,t2)*A(i,2,s,e,t1,t2) for i in range(s,e+1)])
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x1 = sum([xComponent(i,s,e)*A(i,1,s,e,t1,t2) for i in range(s,e+1)])
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x2 = sum([xComponent(i,s,e)*A(i,2,s,e,t1,t2) for i in range(s,e+1)])
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# calculate Determinate of the 3 matrices
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det_cc = c11 * c22 - c21 * c12
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det_cx = c11 * x2 - c12 * x1
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det_xc = x1 * c22 - x2 * c12
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# if matrix is not homogenous, fudge the data a bit
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if det_cc == 0:
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det_cc=0.01
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# alpha's are the correct offset for bezier handles
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alpha0 = det_xc / det_cc #offset from right (first) point
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alpha1 = det_cx / det_cc #offset from left (last) point
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sRightHandle = data_pts[s].co.copy()
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sTangent = t1*abs(alpha0)
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sRightHandle+= sTangent #position of first pt's handle
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eLeftHandle = data_pts[e].co.copy()
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eTangent = t2*abs(alpha1)
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eLeftHandle+= eTangent #position of last pt's handle.
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#return a 4 member tuple representing the bezier
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return (data_pts[s].co,
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sRightHandle,
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eLeftHandle,
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data_pts[e].co)
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# convert 2 given data points into a cubic bezier.
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# handles are offset along the tangent at a 3rd of the length between the points.
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def fitSingleCubic2Pts(data_pts,s,e):
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alpha0 = alpha1 = (data_pts[s].co-data_pts[e].co).length / 3
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sRightHandle = data_pts[s].co.copy()
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sTangent = unitTangent(s,data_pts)*abs(alpha0)
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sRightHandle+= sTangent #position of first pt's handle
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eLeftHandle = data_pts[e].co.copy()
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eTangent = unitTangent(e,data_pts)*abs(alpha1)
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eLeftHandle+= eTangent #position of last pt's handle.
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#return a 4 member tuple representing the bezier
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return (data_pts[s].co,
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sRightHandle,
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eLeftHandle,
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data_pts[e].co)
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#evaluate bezier, represented by a 4 member tuple (pts) at point t.
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def bezierEval(pts,t):
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sumVec = Vector((0,0,0,0))
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for i in range(4):
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sumVec+=pts[i]*bernsteinPoly(3,i,t)
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return sumVec
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#calculate the highest error between bezier and original data
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#returns the distance and the index of the point where max error occurs.
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def maxErrorAmount(data_pts,bez,s,e):
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maxError = 0
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maxErrorPt = s
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if e-s<3: return 0, None
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for pt in data_pts[s:e+1]:
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bezVal = bezierEval(bez,pt.u)
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tmpError = (pt.co-bezVal).length/pt.co.length
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if tmpError >= maxError:
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maxError = tmpError
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maxErrorPt = pt.index
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return maxError,maxErrorPt
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#calculated bezier derivative at point t.
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#That is, tangent of point t.
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def getBezDerivative(bez,t):
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n = len(bez)-1
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sumVec = Vector((0,0,0,0))
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for i in range(n-1):
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sumVec+=bernsteinPoly(n-1,i,t)*(bez[i+1]-bez[i])
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return sumVec
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#use Newton-Raphson to find a better paramterization of datapoints,
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#one that minimizes the distance (or error) between bezier and original data.
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def newtonRaphson(data_pts,s,e,bez):
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for pt in data_pts[s:e+1]:
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if pt.index==s:
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pt.u=0
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elif pt.index==e:
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pt.u=1
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else:
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u = pt.u
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qu = bezierEval(bez,pt.u)
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qud = getBezDerivative(bez,u)
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#we wish to minimize f(u), the squared distance between curve and data
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fu = (qu-pt.co).length**2
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fud = (2*(qu.x-pt.co.x)*(qud.x))-(2*(qu.y-pt.co.y)*(qud.y))
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if fud==0:
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fu = 0
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fud = 1
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pt.u=pt.u-(fu/fud)
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def createDataPts(curveGroup, group_mode):
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data_pts = []
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if group_mode:
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for i in range(len(curveGroup[0].keyframe_points)):
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x = curveGroup[0].keyframe_points[i].co.x
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y1 = curveGroup[0].keyframe_points[i].co.y
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y2 = curveGroup[1].keyframe_points[i].co.y
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y3 = curveGroup[2].keyframe_points[i].co.y
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data_pts.append(dataPoint(i,Vector((x,y1,y2,y3))))
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else:
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for i in range(len(curveGroup.keyframe_points)):
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x = curveGroup.keyframe_points[i].co.x
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y1 = curveGroup.keyframe_points[i].co.y
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y2 = 0
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y3 = 0
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data_pts.append(dataPoint(i,Vector((x,y1,y2,y3))))
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return data_pts
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def fitCubic(data_pts,s,e):
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if e-s<3: # if there are less than 3 points, fit a single basic bezier
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bez = fitSingleCubic2Pts(data_pts,s,e)
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else:
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#if there are more, parameterize the points and fit a single cubic bezier
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chordLength(data_pts,s,e)
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bez = fitSingleCubic(data_pts,s,e)
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#calculate max error and point where it occurs
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maxError,maxErrorPt = maxErrorAmount(data_pts,bez,s,e)
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#if error is small enough, reparameterization might be enough
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if maxError<reparaError and maxError>error:
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for i in range(maxIterations):
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newtonRaphson(data_pts,s,e,bez)
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if e-s<3:
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bez = fitSingleCubic2Pts(data_pts,s,e)
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else:
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bez = fitSingleCubic(data_pts,s,e)
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#recalculate max error and point where it occurs
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maxError,maxErrorPt = maxErrorAmount(data_pts,bez,s,e)
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#repara wasn't enough, we need 2 beziers for this range.
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#Split the bezier at point of maximum error
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if maxError>error:
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fitCubic(data_pts,s,maxErrorPt)
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fitCubic(data_pts,maxErrorPt,e)
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else:
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#error is small enough, return the beziers.
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beziers.append(bez)
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return
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def createNewCurves(curveGroup,beziers,group_mode):
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#remove all existing data points
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if group_mode:
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for fcurve in curveGroup:
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for i in range(len(fcurve.keyframe_points)-1,0,-1):
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fcurve.keyframe_points.remove(fcurve.keyframe_points[i])
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else:
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fcurve = curveGroup
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for i in range(len(fcurve.keyframe_points)-1,0,-1):
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fcurve.keyframe_points.remove(fcurve.keyframe_points[i])
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#insert the calculated beziers to blender data.\
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if group_mode:
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for fullbez in beziers:
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for i,fcurve in enumerate(curveGroup):
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bez = [Vector((vec[0],vec[i+1])) for vec in fullbez]
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newKey = fcurve.keyframe_points.insert(frame=bez[0].x,value=bez[0].y)
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newKey.handle_right = (bez[1].x,bez[1].y)
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newKey = fcurve.keyframe_points.insert(frame=bez[3].x,value=bez[3].y)
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newKey.handle_left= (bez[2].x,bez[2].y)
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else:
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for bez in beziers:
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for vec in bez:
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vec.resize_2d()
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newKey = fcurve.keyframe_points.insert(frame=bez[0].x,value=bez[0].y)
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newKey.handle_right = (bez[1].x,bez[1].y)
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newKey = fcurve.keyframe_points.insert(frame=bez[3].x,value=bez[3].y)
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newKey.handle_left= (bez[2].x,bez[2].y)
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#indices are detached from data point's frame (x) value and stored in the dataPoint object, represent a range
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data_pts = createDataPts(curveGroup,group_mode)
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s = 0 #start
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e = len(data_pts)-1 #end
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beziers = []
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#begin the recursive fitting algorithm.
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fitCubic(data_pts,s,e)
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#remove old Fcurves and insert the new ones
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createNewCurves(curveGroup,beziers,group_mode)
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#Main function of simplification
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#sel_opt: either "sel" or "all" for which curves to effect
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#error: maximum error allowed, in fraction (20% = 0.0020), i.e. divide by 10000 from percentage wanted.
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#group_mode: boolean, to analyze each curve seperately or in groups, where group is all curves that effect the same property (e.g. a bone's x,y,z rotation)
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def fcurves_simplify(sel_opt="all", error=0.002, group_mode=True):
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# main vars
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context = bpy.context
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obj = context.active_object
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fcurves = obj.animation_data.action.fcurves
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if sel_opt=="sel":
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sel_fcurves = [fcurve for fcurve in fcurves if fcurve.select]
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else:
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sel_fcurves = fcurves[:]
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#Error threshold for Newton Raphson reparamatizing
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reparaError = error*32
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maxIterations = 16
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if group_mode:
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fcurveDict = {}
|
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#this loop sorts all the fcurves into groups of 3, based on their RNA Data path, which corresponds to which property they effect
|
||||
for curve in sel_fcurves:
|
||||
if curve.data_path in fcurveDict: #if this bone has been added, append the curve to its list
|
||||
fcurveDict[curve.data_path].append(curve)
|
||||
else:
|
||||
fcurveDict[curve.data_path] = [curve] #new bone, add a new dict value with this first curve
|
||||
fcurveGroups = fcurveDict.values()
|
||||
else:
|
||||
fcurveGroups = sel_fcurves
|
||||
|
||||
if error>0.00000:
|
||||
#simplify every selected curve.
|
||||
totalt = 0
|
||||
for i,fcurveGroup in enumerate(fcurveGroups):
|
||||
print("Processing curve "+str(i+1)+"/"+str(len(fcurveGroups)))
|
||||
t = time.clock()
|
||||
simplifyCurves(fcurveGroup,error,reparaError,maxIterations,group_mode)
|
||||
t = time.clock() - t
|
||||
print(str(t)[:5]+" seconds to process last curve")
|
||||
totalt+=t
|
||||
print(str(totalt)[:5]+" seconds, total time elapsed")
|
||||
|
||||
return
|
||||
|
Loading…
Reference in New Issue
Block a user