box_sdf — 3D sdf_csg op

• Data kinds: coordgrid → sdf

• Call: import fullseye as fs; fs.ledger.box_sdf(grid, center, half_extents) (to call the implementation directly, import sdf_ops; sdf_ops.box_sdf(grid, center, half_extents); from the registry, ops3d.get("box_sdf"))

Usage

The exact signed distance field of an axis-aligned box (negative inside, positive outside).

> The detailed description below is the original text — the summary and the headings are translated.

Inigo Quilez の box SDF: `q = |p-center| - half_extents` とし、

`outside = |max(q,0)|` (角/辺/面の外はユークリッド距離),

`inside = min(max(q_x,q_y,q_z), 0)` (内側は最近面までの負値),

`sdf = outside + inside`。

`half_extents` は各軸の半辺長(中心から面まで)。外側は厳密距離(角では対角、面前は

垂直距離)、内側も最近面までの厳密負距離を与える。

Raises ValueError for any half_extent<0 or malformed grid/center/half_extents。

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

Runnable examples (verified samples that actually call this op)

• gear_metrology — py -3.11 examples_3d/gear_metrology.py

• render_beauty — py -3.11 examples_3d/render_beauty.py

• sdf_csg — py -3.11 examples_3d/sdf_csg.py

Ops the type connects to (they accept sdf as input)

sdf_to_occupancy · fuse_to_voxel · integrate · extract_surface_points · query_distance · sdf_union · sdf_intersect · sdf_subtract

Same category (sdf_csg)

grid_coords · sphere_sdf · plane_sdf · cylinder_sdf · torus_sdf · capsule_sdf · sdf_union · sdf_intersect

*Provenance: sdf_ops.py — 3D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.