refract — 3D optics op

• Data kinds: vector × normals → normals

• Call: import match3d; match3d.refract(d, n, eta1=1.0, eta2=1.5) (or ops3d.get("refract"))

Usage

Snell refraction (vector form). d = the incident ray (toward the surface), n = the outward normal on the incident side, indices eta1 → eta2.

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)

• snell_refraction — py -3.11 examples_3d/snell_refraction.py

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

icp_point2plane · compute_fpfh · shot_descriptor · fuse_to_voxel · reflect · normal_consistency · ransac_cylinder · orient_normals

Same category (optics)

reflect · fresnel_reflectance · normal_from_reflection · snell_angle

*Provenance: match3d.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.