light op• Data kinds: image2d → image2d
• Call: import fullseye as fs; fs.ledger.shadow_cast_2d(occluder, x, y, steps=None, softness=0.0) (implementation को सीधे call करना हो तो import gfx2d; gfx2d.shadow_cast_2d(occluder, x, y, steps=None, softness=0.0), registry से लेना हो तो opsgfx2d.get("shadow_cast_2d"))
(x, y) पर point light से हर pixel की visibility, image2d के रूप में।
> नीचे का विस्तृत विवरण मूल text में है — सारांश और headings का अनुवाद हो चुका है।
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.
• Sample data catalog (DL URL / license) — 2-D के लिए skimage.data (BSD/public) + synthetic, 3-D के लिए real data sources (Stanford/PDS आदि) के DL URL।
• Operators का स्रोत और संदर्भ — इस op family के मूल research/methods के स्रोत।
• Algorithm का मानक स्रोत (लेखक, वर्ष) और उपयोग ऊपर की family usage guide में दिए गए हैं।
• gfx2d_scene — py -3.11 examples/gfx2d_scene.py
image2d को input के रूप में लेते हैं)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 operator registry. यह per-op note tools/opdocs.py md से अपने-आप generate होता है (हाथ से edit न करें)।*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.