折り紙 – 山折り谷折りで立体化

#origami#triangle#center#parametric

✅ Inputs

- `size`: float – 正方形の一辺の長さ
- `fold_depth`: float – 0〜0.5 の範囲で、辺の中点を中心にどれだけ寄せるか（折り込みの深さ）

✅ Outputs

- `results`: list of `Brep` – 谷折りされた8枚の三角面からなる立体構造

✅ Code

import Rhino.Geometry as rg
import math

center_height = fold_depth * size

p0 = rg.Point3d(0, 0, 0)
p1 = rg.Point3d(size, 0, 0)
p2 = rg.Point3d(size, size, 0)
p3 = rg.Point3d(0, size, 0)

center = rg.Point3d(size / 2, size / 2, center_height)

mid_bottom = rg.Point3d(size / 2, 0 + fold_depth * size, 0)
mid_right  = rg.Point3d(size - fold_depth * size, size / 2, 0)
mid_top    = rg.Point3d(size / 2, size - fold_depth * size, 0)
mid_left   = rg.Point3d(0 + fold_depth * size, size / 2, 0)

corners = [p0, p1, p2, p3]
midpoints = [mid_bottom, mid_right, mid_top, mid_left]

results = []

for i in range(4):
    c0 = corners[i]
    c1 = corners[(i + 1) % 4]
    m = midpoints[i]

    tri1 = rg.Brep.CreateFromCornerPoints(center, m, c0, 0.001)
    results.append(tri1)

    tri2 = rg.Brep.CreateFromCornerPoints(c1, center, m, 0.001)
    results.append(tri2)

← Back to Grasshopper Python Tutorials

License & Terms of Use

Item	Allowed	Description
Integration into your projects	○	You are free to use the code as part of your scripts or works, whether for personal or commercial purposes.
Code modification & learning use	○	Customizing the code for your own learning or specific purposes is very welcome.
Sharing on SNS / showcasing	○	No permission is required to share images or URLs of your works. Please feel free to showcase them!
Redistribution / republishing	×	Do not publish the code or files in their entirety as content on your own site or elsewhere.
Reselling as materials/programs	×	Do not sell the content of this site, either as-is or with only minor modifications, for a fee.
Copyright notice / link	Optional	Not required, but including a link to the source would be greatly appreciated.