brdf_blinn_phong — SPECULAR `reflectance` op

• データ種: normalmap → image2d

• 呼び出し: import fullseye as fs; fs.ledger.brdf_blinn_phong(normals, light=(0.0, 0.0, 1.0), view=(0.0, 0.0, 1.0), shininess=32.0) (実装を直接呼ぶなら import specularity; specularity.brdf_blinn_phong(normals, light=(0.0, 0.0, 1.0), view=(0.0, 0.0, 1.0), shininess=32.0)、台帳から引くなら opsspecular.get("brdf_blinn_phong"))

使い方

Blinn のハーフベクトル鏡面ローブ。→ [0, 1] の (H, W)。

> 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。

max(n.h, 0) ** shininess where h is the unit bisector of the light and view directions (Blinn 1977), zeroed wherever the surface faces away from either. Exactly 1 where the normal *is* the half-vector — the mirror condition — and it falls monotonically from there.

Unnormalised on purpose. The classical Blinn-Phong lobe does not integrate to a fixed value; its peak is 1 and its energy grows as the exponent shrinks. It is a shading model, useful because its peak location is exact and because it is a *different* lobe shape from brdf_microfacet — a separation routine that only works on one of the two is fitting the lobe, not the model. For an energy-consistent lobe use brdf_microfacet.

Reciprocal in light and view to machine precision (measured exactly 0.0 maximum difference in tests/test_specularity.py), because the half-vector is symmetric and the visibility test covers both sides.

Raises ValueError: *normals* is not an (H, W, 3) field or contains a zero-length normal; *light* / *view* are not non-zero 3-vectors; *shininess* is negative, non-finite, a string or a bool; light and view are exactly opposite.

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(`image2d` を入力に取れる)

polarization_render

同カテゴリ(`reflectance`)

brdf_microfacet · dichromatic_render

*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)。*

brdf_blinn_phong — SPECULAR reflectance op

使い方