grid_coords — 3D sdf_csg op

• Data kinds: none → coordgrid (an op determined by its arguments alone — it takes no image or data input)

• Call: import fullseye as fs; fs.ledger.grid_coords(bounds, res) (to call the implementation directly, import sdf_ops; sdf_ops.grid_coords(bounds, res); from the registry, ops3d.get("grid_coords"))

• Return value through the ledger: fullseye.ledger.grid_coords(...) returns only the declared out type coordgrid (the underlying function also returns auxiliary values). When you need what was dropped, use fullseye.ledger.grid_coords.raw(...) or call sdf_ops.grid_coords directly.

Usage

Build the grid of voxel-centre coordinates for CSG evaluation (the same lattice convention as occupancy).

bounds=((xmin,xmax),(ymin,ymax),(zmin,zmax)), res is the number of voxels per axis (scalar = cube or length 3). The centre of voxel i is world lo + (i+0.5)/res * span (consistent with occupancy.query_distance's c=(q-lo)/span*res-0.5 = centre-aligned). The return values are coords of shape (nx,ny,nz,3) and extent=(xmin,xmax,ymin,ymax,zmin,zmax).

Evaluate sphere_sdf/box_sdf on coordinates made this way and combine them with CSG, and the result can be passed directly to the marching cubes of recon3d or to the zero-crossing extraction of occupancy.

Raises ValueError for degenerate bounds or res<=0.

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

• 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 coordgrid as input)

fuse_to_voxel · sphere_sdf · box_sdf · plane_sdf · cylinder_sdf · torus_sdf · capsule_sdf

Same category (sdf_csg)

sphere_sdf · box_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.