dichromatic_render — SPECULAR `reflectance` op

• データ種: normalmap → rgbimage

• 呼び出し: import specularity; specularity.dichromatic_render(normals, albedo_rgb=(0.8, 0.55, 0.35), light=(0.3, 0.2, 1.0), illuminant_rgb=(1.0, 1.0, 1.0), view=(0.0, 0.0, 1.0), specular=0.25, model='blinn_phong', shininess=32.0, roughness=0.3, f0=0.04, ambient=0.0) (または opsspecular.get("dichromatic_render"))

使い方

二色性モデルの順方向: 既知のハイライトを描き、分離結果をそれと突き合わせられるようにする。→ (H, W, 3)。

> 以下の詳細説明は原文のままです —— 要約と見出しは訳出済み。

`I = albedo_rgb * max(n.l, 0) + specular * lobe(n) * illuminant_unit`, the

body term coming straight from :func:photometric.render_lambertian (called,

not re-implemented, so the two modules cannot drift apart in convention) and

the interface term carrying the illuminant colour, which is what makes

the image obey the dichromatic model exactly.

*albedo_rgb* may be a single `(3,)` colour — the single-material case that

:func:specular_diffuse_split handles without help — or an `(H, W, 3)`

map, which is the textured case that needs `body_rgb` passed to the split.

*model* selects the lobe: `"blinn_phong"` (*shininess*) or

`"microfacet"` (*roughness*, *f0*). Both are available on purpose: the

separation operators must be blind to the lobe shape, and swapping the model

is how that is tested rather than asserted.

This is a shading model, not light transport. No interreflection, no

cast shadow, no subsurface term, no occlusion between pixels — the same

boundary :mod:visiondesign draws. Its purpose is a synthetic image whose

decomposition is known exactly.

Raises `ValueError`: geometry problems as in

:func:brdf_blinn_phong; *albedo_rgb* is neither `(3,)` nor

`(H, W, 3)`; *specular* or *ambient* is negative, non-finite, a string or

a bool; *model* is not in :data:BRDF_MODELS.

詳しい使い方ガイド

• specular_photometric ファミリガイド

参考(サンプルデータ・文献)

• サンプルデータカタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。

• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。

• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

• specular_photometric — py -3.11 examples/specular_photometric.py

型が繋がる次の op(`rgbimage` を入力に取れる)

specular_diffuse_split · specular_coefficient_map · specular_free_transform · illuminant_from_dichromatic_planes

同カテゴリ(`reflectance`)

brdf_blinn_phong · brdf_microfacet

*Provenance: specularity.py — SPECULAR operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。*

dichromatic_render — SPECULAR reflectance op

使い方