sphere_sdf — 3D sdf_csg op

• Data kinds: coordgrid → sdf

• Call: import sdf_ops; sdf_ops.sphere_sdf(grid, center, R) (or ops3d.get("sphere_sdf"))

Usage

The signed distance field of a sphere: `|p − center| − R` (negative inside, positive outside).

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)

• annotate3d_figure — py -3.11 examples_3d/annotate3d_figure.py

• gear_metrology — py -3.11 examples_3d/gear_metrology.py

• molecule_atom_count — py -3.11 examples_3d/molecule_atom_count.py

• procedural_hand — py -3.11 examples_3d/procedural_hand.py

• render_beauty — py -3.11 examples_3d/render_beauty.py

• sdf_csg — py -3.11 examples_3d/sdf_csg.py

• sfm_recon — py -3.11 examples_3d/sfm_recon.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 · box_sdf · sdf_union · sdf_intersect · sdf_subtract · sdf_smooth_union · sdf_offset

*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.