Minher0 863f0e49c1 Render the Environment light's shadow from its image (#2436) ...

The Casts Shadows option Environment lights got is only half a fix if
nothing shades for it: an image lights the scene from every direction,
and what occludes that light is the image itself — its dominant bright
region, the sun in a sky map.

- dominant_direction finds it: the radiance-weighted mean texel
  direction (solid-angle weighted, rotation applied). A uniform image
  cancels to zero — a flat default environment shines from everywhere
  at once and casts no shadow, which a uniform environment test pins.
- The shadow is one orthographic map over the scene from that
  direction, after the lights' maps, like a parallel light's: PCF
  widened by Shadow Diffusion, darkened by Shadow Darkness, cleared
  when nothing casts, the image is directionless, or the texel budget
  drops it.
- It darkens the environment's own diffuse and specular light on
  Accepts Shadows surfaces and counts in Cast Shadows Only. CPU and
  GPU (WGSL) do the same; Globals carries the environment's sun
  direction and shadow settings (40 → 44 floats, preflight updated).

A bright-disc environment turned to shine from behind the camera now
shadows a sphere onto the floor behind it, Cast Shadows off lights it
evenly again, and the GPU scene's sky gradient takes a shadow-casting
Environment light. Also: the renderer-switch toasts read "...renderer,
which draws 3D models", the dialog's Casts Shadows checkbox gets an
auto id (dialog.light.casts) the tests click, and the docs' Environment
notes cover the shadow.

2026-10-26 13:05:16 +00:00

..

src

Render the Environment light's shadow from its image (#2436)

2026-10-26 13:05:16 +00:00

Cargo.toml

fix: contain GPU initialization and retire failed readbacks

2026-10-06 16:40:12 -05:00