import rhinoscriptsyntax as rs
from math import *
import math as m
a = 1
b = 0.2
pts1 = []
pts2 = []
pts3 = []
for t in range(0, 30):
x = a * m.exp(b*t) * m.cos(t)
y = a * m.exp(b*t) * m.sin(t)
pts1.append(rs.AddPoint(x/4,y/4,0))
pts2.append(rs.AddPoint(x/1.3,y/1.3,15))
pts3.append(rs.AddPoint(x,y,30))
curve1 = rs.AddInterpCurve(pts1)
curve2 = rs.AddInterpCurve(pts2)
curve3 = rs.AddInterpCurve(pts3)
# LOFTING SURFACE
strSurf = rs.AddLoftSrf([curve1, curve2, curve3])
listcurves = []
for i in range(0, 23):
pointcoord1=rs.PointCoordinates(pts3[i])
pointcoord1a=rs.PointCoordinates(pts3[i+1])
pointcoord2=rs.PointCoordinates(pts3[i+6])
pointcoord2a=rs.PointCoordinates(pts3[i+7])
pointcoord3=rs.PointCoordinates(pts1[i])
pointcoord3a=rs.PointCoordinates(pts1[i+1])
pointcoord4=rs.PointCoordinates(pts1[i+6])
pointcoord4a=rs.PointCoordinates(pts1[i+7])
topcrv = rs.AddCurve([pointcoord2a, pointcoord2, pointcoord1, pointcoord1a])
interpolcrv1 = rs.AddInterpCrvOnSrf(strSurf, [pointcoord1, pointcoord3])
rs.ObjectColor(interpolcrv1,[255,0,0])
interpolcrv2 = rs.AddInterpCrvOnSrf(strSurf, [pointcoord4, pointcoord3])
rs.ObjectColor(interpolcrv2,[0,0,255])
rs.AddLoftSrf([interpolcrv1, topcrv])
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