light op• 資料種類:無 → rgb(僅由參數決定的運算子 —— 不接受影像或資料輸入)
• 呼叫:import gfx2d; gfx2d.radial_light(height, width, x, y, radius, intensity=1.0, falloff='smooth', color='emphasis', scheme='okabe_ito')(或 opsgfx2d.get("radial_light"))
以 `(x, y) 為中心的放射狀光照圖 rgb (H, W, 3)`。
> 以下的詳細說明為原文 —— 摘要與標題已翻譯。
`falloff`:
• `"smooth" — (1 - t^2)^2`, compactly supported: exactly zero at and
beyond `radius`. The default, because a light that ends somewhere is the
only kind you can budget.
• `"linear" — 1 - t`, also compact.
• `"inverse_square" — 1 / (1 + (3t)^2)`, the physical law softened at
the origin. Not compactly supported: it is 10 % of peak at the nominal
radius and never reaches zero, so a scene full of these never gets dark.
The value at the centre is exactly `intensity * color`. This is a
*linear-light* quantity: add lights together, then encode once.
With `intensity > 1 the result leaves [0, 1]` — deliberately, because a
light map is not a picture. :func:light_mask accepts it; the operators that
take an `rgb` *image* reject it with the documented range error rather than
clipping a light budget behind your back.
• 範例資料目錄(下載 URL / 授權) —— 2-D 用 skimage.data(BSD/公有領域)加合成圖,3-D 給出真實資料源(Stanford/PDS 等)的下載 URL。
• 運算子來歷與參考文獻 —— 該運算子族所依據的研究/方法出處。
• 演算法的正典(作者・年份)與用途見上面的族使用指南。
• gfx2d_scene — py -3.11 examples/gfx2d_scene.py
rgb 作為輸入)srgb_to_linear · linear_to_srgb · blend_mode · light_mask · normal_map_decode · bloom · vignette · chromatic_aberration
light)light_mask · normal_map_decode · normal_map_shade · shadow_cast_2d
*Provenance: gfx2d.py — GFX2D 運算子登記表。本條目由 tools/opdocs.py md 自動產生(請勿手動編輯)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.