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December 6, 2025 05:17
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code_to_make_chain_in_grasshopper
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| import Rhino.Geometry as rg | |
| import math | |
| Chain = [] | |
| try: | |
| N_int = int(round(N)) | |
| except: | |
| N_int = 0 | |
| try: | |
| style = int(round(S)) if S is not None else 0 | |
| except: | |
| style = 0 | |
| if N_int < 1: | |
| print("N < 1, nothing to build") | |
| else: | |
| link_len = float(L) if L and L > 0 else 12.0 | |
| link_h = float(W) if W and W > 0 else 6.0 | |
| wire_r = float(R) if R and R > 0 else 1.0 | |
| overlap = float(C) if C and 0.1 < C < 0.9 else 0.6 | |
| if link_len <= link_h: | |
| link_len = link_h + 2.0 | |
| if wire_r * 2.0 >= link_h: | |
| wire_r = link_h * 0.25 | |
| tol = 0.01 | |
| a = link_len * 0.5 | |
| b = link_h * 0.5 | |
| pl = rg.Plane.WorldYZ | |
| el = rg.Ellipse(pl, a, b) | |
| crv_full = el.ToNurbsCurve() | |
| dom = crv_full.Domain | |
| t0, t1 = dom.T0, dom.T1 | |
| span = t1 - t0 | |
| gap_frac = 0.18 | |
| cut_start = t0 + gap_frac * 0.5 * span | |
| cut_end = t1 - gap_frac * 0.5 * span | |
| crv_open = crv_full.Trim(cut_start, cut_end) | |
| if not crv_open: | |
| crv_open = crv_full | |
| pipes_closed = rg.Brep.CreatePipe( | |
| crv_full, | |
| wire_r, | |
| False, | |
| rg.PipeCapMode.Round, | |
| True, | |
| tol, | |
| tol | |
| ) | |
| pipes_open = rg.Brep.CreatePipe( | |
| crv_open, | |
| wire_r, | |
| False, | |
| rg.PipeCapMode.Round, | |
| True, | |
| tol, | |
| tol | |
| ) | |
| if not pipes_closed or not pipes_open: | |
| print("Pipe failed – check L, W, R") | |
| else: | |
| closed_link = pipes_closed[0] | |
| open_link = pipes_open[0] | |
| links = [] | |
| max_step = link_len * 0.9 | |
| min_step = wire_r * 2.0 | |
| step = min_step + (max_step - min_step) * overlap | |
| for i in range(N_int): | |
| if i == 0 or i == N_int - 1: | |
| base = open_link | |
| else: | |
| base = closed_link | |
| link = base.DuplicateBrep() | |
| cx = i * step | |
| center_pt = rg.Point3d(cx, 0.0, 0.0) | |
| t_move = rg.Transform.Translation(cx, 0.0, 0.0) | |
| link.Transform(t_move) | |
| if i % 2 == 1: | |
| t_rot = rg.Transform.Rotation( | |
| math.pi * 0.5, | |
| rg.Vector3d.YAxis, | |
| center_pt | |
| ) | |
| link.Transform(t_rot) | |
| t_global = rg.Transform.Rotation( | |
| math.pi * 0.5, | |
| rg.Vector3d.ZAxis, | |
| center_pt | |
| ) | |
| link.Transform(t_global) | |
| scale = 1.0 | |
| if style == 1: | |
| pattern = [1.3, 1.3, 1.0, 1.0, 1.0] | |
| scale = pattern[i % len(pattern)] | |
| elif style == 2 and N_int > 1: | |
| t = float(i) / float(N_int - 1) | |
| center_weight = 1.0 - abs(2.0 * t - 1.0) | |
| scale = 0.8 + 0.4 * center_weight | |
| if abs(scale - 1.0) > 1e-6: | |
| s_tf = rg.Transform.Scale(center_pt, scale) | |
| link.Transform(s_tf) | |
| links.append(link) | |
| Chain = links | |
| print("Links created:", len(Chain), "step =", step, "style =", style) |
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