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19abe39 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 | """
Matplotlib 3D animation of origami folding using OrigamiSimulator.
Usage:
python -m sim.animate [target_name]
target_name defaults to 'half_horizontal', resolved against
env/targets/<target_name>.fold relative to this file's parent directory.
"""
from __future__ import annotations
import json
import sys
from pathlib import Path
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np
from mpl_toolkits.mplot3d.art3d import Poly3DCollection
from .simulator import OrigamiSimulator
# ── Design system colours ─────────────────────────────────────────────────────
BG_COLOR = '#0d0d14'
AX_COLOR = '#13131d'
PAPER_FACE = '#fafaf5'
PAPER_EDGE = '#2a2a3a'
MOUNTAIN_CLR = '#f59e0b' # amber
VALLEY_CLR = '#38bdf8' # sky
# ── Public API ────────────────────────────────────────────────────────────────
def animate_fold(fold_file: str,
n_frames: int = 80,
steps_per_frame: int = 40,
target_name: str = 'origami') -> None:
"""
Animate folding from 0% → 100% → 0% in a triangle-wave loop.
Parameters
----------
fold_file : str
Path to the .fold JSON file.
n_frames : int
Total animation frames (default 80 → ~40 in, 40 out).
steps_per_frame : int
Physics steps executed per frame.
target_name : str
Display name shown in the title.
"""
fold_data = json.loads(Path(fold_file).read_text())
sim = OrigamiSimulator(fold_data, subdivisions=2)
# Triangle-wave fold percents: 0 → 1 → 0
half = n_frames // 2
fold_percents = np.concatenate([
np.linspace(0.0, 1.0, half),
np.linspace(1.0, 0.0, n_frames - half),
])
# ── Figure setup ──────────────────────────────────────────────────────────
fig = plt.figure(figsize=(9, 7), facecolor=BG_COLOR)
ax = fig.add_subplot(111, projection='3d')
ax.set_facecolor(AX_COLOR)
ax.xaxis.pane.fill = False
ax.yaxis.pane.fill = False
ax.zaxis.pane.fill = False
ax.grid(False)
ax.set_axis_off()
def update(frame: int) -> list:
pct = fold_percents[frame]
sim.set_fold_percent(pct)
sim.step(steps_per_frame)
ax.clear()
ax.set_facecolor(AX_COLOR)
ax.xaxis.pane.fill = False
ax.yaxis.pane.fill = False
ax.zaxis.pane.fill = False
ax.grid(False)
ax.set_axis_off()
# ── Paper surface ─────────────────────────────────────────────────────
verts = [sim.pos[tri] for tri in sim.triangles]
poly = Poly3DCollection(
verts,
alpha=0.85,
facecolor=PAPER_FACE,
edgecolor=PAPER_EDGE,
linewidth=0.2,
zorder=1,
)
ax.add_collection3d(poly)
# ── Crease / fold edges ───────────────────────────────────────────────
for i in range(len(sim._crease_a)):
if sim._crease_assign[i] not in ('M', 'V'):
continue
a, b = sim._crease_a[i], sim._crease_b[i]
color = MOUNTAIN_CLR if sim._crease_assign[i] == 'M' else VALLEY_CLR
ax.plot(
[sim.pos[a, 0], sim.pos[b, 0]],
[sim.pos[a, 1], sim.pos[b, 1]],
[sim.pos[a, 2], sim.pos[b, 2]],
color=color,
linewidth=2.5,
zorder=2,
)
# ── Axis limits & style ───────────────────────────────────────────────
ax.set_xlim(-0.2, 1.2)
ax.set_ylim(-0.2, 1.2)
ax.set_zlim(-0.6, 0.6)
ax.set_box_aspect([1.4, 1.4, 1.0])
ax.set_title(
f'OPTIGAMI — {target_name} fold: {pct * 100:.0f}%',
color='#e0e0f0',
fontsize=13,
pad=10,
)
return []
ani = animation.FuncAnimation(
fig,
update,
frames=n_frames,
interval=40, # ms between frames (~25 fps)
blit=False,
)
plt.tight_layout()
plt.show()
def main() -> None:
target = sys.argv[1] if len(sys.argv) > 1 else 'half_horizontal'
fold_file = Path(__file__).parent.parent / 'env' / 'targets' / f'{target}.fold'
if not fold_file.exists():
print(f'Error: fold file not found: {fold_file}', file=sys.stderr)
sys.exit(1)
animate_fold(str(fold_file), target_name=target)
if __name__ == '__main__':
main()
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