terrain op• Datenarten: mesh → mesh
• Aufruf: import fullseye as fs; fs.ledger.mesh_scatter_boulders(V, F, *, density: 'float', d_min: 'float', d_max=None, exponent: 'float' = 3.1, seed: 'int' = 0, region_weights=None, aspect=(1.0, 0.7, 0.5), embed: 'float' = 0.35, subdiv: 'int' = 1, shape: 'str' = 'ellipsoid', orientation: 'str' = 'normal', burial=(0.3, 0.6), max_count=None, hull_points=None, return_info: 'bool' = False) (die Implementierung direkt: import render3d; render3d.mesh_scatter_boulders(V, F, *, density: 'float', d_min: 'float', d_max=None, exponent: 'float' = 3.1, seed: 'int' = 0, region_weights=None, aspect=(1.0, 0.7, 0.5), embed: 'float' = 0.35, subdiv: 'int' = 1, shape: 'str' = 'ellipsoid', orientation: 'str' = 'normal', burial=(0.3, 0.6), max_count=None, hull_points=None, return_info: 'bool' = False); aus dem Register: ops3d.get("mesh_scatter_boulders"))
Verstreut halb eingesunkene Felsblöcke auf einem Mesh (Potenzgesetz-Größen, geseedet) → `(V, F)`.
> Die ausführliche Beschreibung unten ist der Originaltext — Zusammenfassung und Überschriften sind übersetzt.
(or `(V, F, info) with return_info=True`).
`shape='ellipsoid'` (default, unchanged behaviour): icosphere ellipsoids with semi-axes
`D/2 × aspect` (1 : 0.7 : 0.5, shortest axis along the local surface normal), spun about
the normal and sunk by `embed` (0 = resting, 1 = centre on the surface).
`shape='hull'`: angular blocks — the convex hull of seeded random points on an
ellipsoid of the same aspect with 20 % radial jitter (flat facets, sharp edges, the
look of Itokawa's boulders), `hull_points` per block (default size-dependent:
`10 + 8·log2(D/d_min), 10..40). orientation='random'` gives each block a uniform
random rotation instead of aligning its short axis with the normal. For hulls the sink
is the size-dependent `burial fraction from :func:sample_boulders` (30–60 % of the
block's height below the surface by default; `embed is ignored). max_count` caps
the expected number by raising `d_min` along the same law (see
:func:sample_boulders; `info['d_min_effective']` reports it).
Placement and sizes come from :func:sample_boulders (Poisson process,
N(>D) ∝ D^-exponent); boulders sit on the mesh *as passed* — pass the displaced /
subdivided terrain so they rest on the final surface. `region_weights` from
:func:terrain_region_mask keeps the seas smooth. The boulders are appended as real
geometry, so they self-shadow, cast shadows and occlude through the same rasteriser /
ray-cast path as the terrain. `info = the sample dict plus faces_per_boulder`
and `n_boulders. Deterministic under seed`. Fail-closed.
手順: :func:sample_boulders で位置(面上の一様点)・面法線・直径 `D` を引き、岩ごとに
小さなメッシュを作って入力メッシュの後ろに連結する(頂点は末尾に追加、面 index は
オフセット済み)。入力の頂点・面はそのまま残るので、`info['faces_per_boulder']` と
元の面数から岩の面だけを切り出せる。
• `density: 単位面積(メッシュ単位²)あたりの D ≥ d_min` の岩の期待個数。
実個数はポアソン分布で決まり 0 個もあり得る(そのときは入力のコピーを返す)。
• `d_min < d_max(None = 10·d_min)、exponent > 0、aspect` は正の 3 要素、
`embed ∈ [0, 1]、subdiv ∈ [0, 3] (楕円体の icosphere 細分)、hull_points` は
[6, 200]。いずれも範囲外は `ValueError`。
• `shape='ellipsoid': 半軸 D/2·aspect` の楕円体を最短軸が法線に沿う向きで置き、
中心を法線方向に `semi_z·(1 − embed)` 浮かせる。
• `shape='hull': 楕円体上の乱数点の凸包。法線方向の高さ範囲のうち burial`
(0.3〜0.6 既定、小さい岩ほど深い)の割合が面の下に沈む。`embed` は無視。
• `orientation='random' は一様ランダム回転(4 元数)。'normal'` は法線まわりに
ランダム回転。回転の乱数は `seed + 1` の generator を使う。
岩は実ジオメトリなので `ambient_occlusion / cast_shadow / shadow_raycast` の
レイに普通に当たる。置く面は渡したメッシュそのものなので、`mesh_displace_spectrum` や
`mesh_subdivide` の 後 に呼ぶこと(先に呼ぶと岩が地面から浮く/埋まる)。
• Katalog der Beispieldaten (Download-URLs / Lizenzen) — 2-D nutzt skimage.data (BSD/Public Domain) plus synthetische Bilder, 3-D nennt Download-URLs echter Datenquellen (Stanford, PDS, …).
• Herkunft und Literatur der Operatoren — die Quellen der Forschung/Verfahren, auf denen diese Operatorfamilie beruht.
• itokawa_regolith_hero — py -3.11 examples_3d/itokawa_regolith_hero.py
mesh als Eingabe)mesh_to_voxel · mesh_to_points · to_points · fuse_to_voxel · ambient_occlusion · cast_shadow · supersample_mesh · render_beauty
terrain)mesh_displace_fbm · terrain_region_mask · mesh_edge_lengths · mesh_subdivide · displacement_band_weights · mesh_displace_spectrum · bump_normals_fbm
*Provenance: render3d.py — 3D Operator-Registry. Diese Notiz wird von tools/opdocs.py md erzeugt (nicht von Hand bearbeiten).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.