Bug fixes found while validating stage 15:
- demo: set_shadow_caster(Some(0)) selected the default +Z light (packed
index 0 from Lights::new()); the demo's warm directional light is packed
at index 1. The shadow camera then looked down -Z, so misaligned objects
occluded each other (cone/torus rendered black). Use index 1.
- primitives::torus: index winding was flipped ([a,c,b]); the outer surface
(outward normals, CCW from outside) was culled and only the dark interior
stayed visible. Reversed to [a,b,c]/[b,d,c] so it is CCW from outside.
- app: call device.poll() each frame in about_to_wait; without it wgpu
async callbacks (on_submitted_work_done, map_async) never fire in the
windowed loop.
Docs:
- conf: clarify the embedded-shader fallback is expected/harmless and that
SHADOW_SHADER_PATH is kept for API compatibility only.
- README item 15: runtime-verified headless.
- DRAFT.md: emptied to a completion summary per convention (full stage-15
plan preserved in git history).
Jérôme Bousquié
4bfd712496