light op• 数据种类:image2d → image2d
• 调用: import fullseye as fs; fs.ledger.shadow_cast_2d(occluder, x, y, steps=None, softness=0.0)(要直接调用实现,import gfx2d; gfx2d.shadow_cast_2d(occluder, x, y, steps=None, softness=0.0);从台账取用则 opsgfx2d.get("shadow_cast_2d"))
每个像素相对 (x, y) 点光源的可见性,作为 image2d。
> 以下的详细说明为原文 —— 摘要与标题已翻译。
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.
• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。
• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。
• 算法的正典(作者、年份)与用途见上面的族使用指南。
• gfx2d_scene — py -3.11 examples/gfx2d_scene.py
image2d 作为输入)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 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.