shadow_raycast — 3D `render` op

• Data kinds: mesh × vector → image2d

• Call: import fullseye as fs; fs.ledger.shadow_raycast(V, F, light, *, pose=None, intrinsics=None, width: 'int' = 256, height: 'int' = 256, angular_diameter_deg: 'float' = 0.0, samples: 'int' = 1, grid=None, bias=None) -> 'np.ndarray' (to call the implementation directly, import render_shadow; render_shadow.shadow_raycast(V, F, light, *, pose=None, intrinsics=None, width: 'int' = 256, height: 'int' = 256, angular_diameter_deg: 'float' = 0.0, samples: 'int' = 1, grid=None, bias=None) -> 'np.ndarray'; from the registry, ops3d.get("shadow_raycast"))

Usage

Cast rays directly at the mesh and return the sunlight visibility (H,W) ∈ [0,1] (no shadow map).

> The detailed description below is the original text — the summary and the headings are translated.

`1=完全に照らされる / 0=完全な影。背景画素は 1.0。light` は平行光の方向

(シーン→太陽)。`angular_diameter_deg` は光源の視直径(太陽 = 0.53°)で、0 なら

ハード影、正なら角半径の円盤内へ `samples` 方向をばらまいて平均する ―― 半影の幅は

「遮蔽物までの距離 × tan(視直径/2)」の幾何どおり(小惑星スケールでは数 cm = 硬い影)。

法線が光に背く画素(自己陰)は 0。`bias` はレイ原点を法線方向へ浮かせる量(既定 =

シーン対角 × 1e-5、自己交差の回避)。`grid` は光源空間の 2-D 格子の一辺セル数

(既定 `None = 面数から :func:auto_grid`。結果は格子に依らず同じ、速度だけ変わる)。

honest: 交差は Möller-Trumbore(両面)、加速は 2-D binning(平行光専用。点光源は

`cast_shadow` を使う)。透明・多重反射・カラー影は扱わない。

fail-closed: 退化メッシュ・不正光源・非正サイズ・負の視直径/サンプル数は `ValueError`。

Background guides (the physics and conventions behind this op)

• blender_interop — Blender との併用 — 形を作って fullseye で測る(軸・単位・正解データの罠)

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)

• itokawa_regolith_hero — py -3.11 examples_3d/itokawa_regolith_hero.py

Ops the type connects to (they accept `image2d` as input)

fuse_to_voxel · fit_poly_surface · eval_poly_surface · surface_form_error · background_flatten · polar_unwrap · fit_zernike · matcap_shade

Same category (`render`)

project_points · render_point_depth · render_volume_projection · render_shaded · ambient_occlusion · cast_shadow · phong_shade · matcap_shade

*Provenance: render_shadow.py — 3D operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

shadow_raycast — 3D render op