sdf_csg op• Data kinds: sdf × sdf → sdf
• Call: import fullseye as fs; fs.ledger.sdf_smooth_union(a, b, k) (to call the implementation directly, import sdf_ops; sdf_ops.sdf_smooth_union(a, b, k); from the registry, ops3d.get("sdf_smooth_union"))
A smoothly rounded union (polynomial smooth-min). `k>0` rounds the seam with a radius of about k.
> The detailed description below is the original text — the summary and the headings are translated.
Inigo Quilez の二次多項式 smin:
`h = clip(0.5 + 0.5*(b-a)/k, 0, 1), smin = mix(b,a,h) - k*h*(1-h)`。
性質: (1) 対称 `smin(a,b)=smin(b,a)、(2) smin <= min(a,b)`(継ぎ目でくぼむ)、
(3) k→0 で min(a,b) に一致(= 硬い `sdf_union`)、(4) 1 次同次
`smin(s*a,s*b,s*k)=s*smin(a,b,k)`(スケール整合)。
`k は距離次元の丸め半径。硬い min が欲しければ sdf_union` を使う。
`±inf を含む入力(esdf` の「全自由なら +inf」契約との相互運用)では、
ブレンド帯 `|a-b|<k が退化するため厳密に min(a,b)` を返す。
Raises ValueError for k<=0(0 除算を避けるため fail-closed)。
• 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.
• render_beauty — py -3.11 examples_3d/render_beauty.py
sdf as input)sdf_to_occupancy · fuse_to_voxel · integrate · extract_surface_points · query_distance · sdf_union · sdf_intersect · sdf_subtract
sdf_csg)grid_coords · sphere_sdf · box_sdf · plane_sdf · cylinder_sdf · torus_sdf · capsule_sdf · sdf_union
*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.