perlin2 — DRIVE terrain op

• Data kinds: image2d × image2d → table

• Call: import fullseye as fs; fs.ledger.perlin2(x, y, seed: 'int' = 0, freq: 'float' = 1.0) -> 'dict' (to call the implementation directly, import driveterrain; driveterrain.perlin2(x, y, seed: 'int' = 0, freq: 'float' = 1.0) -> 'dict'; from the registry, opsdrive.get("perlin2"))

Usage

> This operator's description has not been translated yet. The original text follows as it is.

Perlin(2002, improved noise)の 2 次元勾配雑音を世界座標 (x, y) で評価する。

格子は `freq [周期/m] の間隔、勾配は 8 方向の単位ベクトル、補間は quintic fade 6t⁵−15t⁴+10t³`。

返り値 `{"value", "dx", "dy"}(導関数は解析的、d/dx` は世界座標あたり)。定理: 格子点で値 0、

周期 256 格子、|value| ≤ 1。

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.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• poc_world_terrain — py -3.11 examples/poc_world_terrain.py

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

course_layout · course_occupancy · course_contains · world_build · world_camera · world_move · lidar_scan · rss_longitudinal_same

Same category (terrain)

fbm_params · fbm_height · fbm_gradient · radial_periodogram · spectral_slope · course_distance · terrain_params · terrain_height

*Provenance: driveterrain.py — DRIVE 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.