light op• 資料種類:image2d → image2d
• 呼叫: import fullseye as fs; fs.ledger.shadow_cast_2d(occluder, x, y, steps=None, softness=0.0)(要直接呼叫實作,import gfx2d; gfx2d.shadow_cast_2d(occluder, x, y, steps=None, softness=0.0);從台帳取用則 opsgfx2d.get("shadow_cast_2d"))
每個像素相對 (x, y) 點光源的可見性,作為 image2d。
> 以下的詳細說明為原文 —— 摘要與標題已翻譯。
Ray-marches the segment from each pixel to the light, sampling occluder (2-D, [0, 1], 1 = fully blocking) at steps points with nearest lookup, and returns 1 - max(occluder along the ray). For a binary occluder that is exactly 0 or 1 — no tolerance involved.
The sample excludes the pixel itself, so an occluder is lit on its own light-facing surface and casts behind itself.
softness > 0 blurs the visibility map by that sigma afterwards, which is a penumbra-shaped lie rather than a penumbra: a real one widens with distance from the occluder. It is offered because it looks right and named so it cannot be mistaken for physics.
steps defaults to the image diagonal, which samples about once per pixel. An occluder thinner than the step spacing can be missed; that is the honest limit of a fixed-step march and the reason steps is an argument.
• 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
image2d 作為輸入)dither · raw_black_level · raw_dead_pixel_mask · raw_dead_pixel_correct · lens_shading_gain · lens_shading_correct · raw_apply_gains · raw_demosaic_bilinear
light)radial_light · light_mask · normal_map_decode · normal_map_shade
*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.