- LightGrid Radial Ray-Marching (src/game/engine/light-grid.ts):
* Only count line-of-sight blockers (COLLIDE_VISIBLE | COLLIDE_DOOR) in updateObstacles
so floor rocks, stairs, and walkable blockers do not create dark spots.
* Trace radial rays from emitter to target cell (1 <= s < steps) so the emitter's
own cell is never self-occluded when hugging a wall, wall front-faces receive full
illumination, and authentic shadows are cast behind walls.
- Ground-Plane Vertical Elevation Compensation (src/render/renderer.ts):
* Encode vertical sprite elevation (elevationY) in top quad vertices while strictly
preserving the 10-float vertex stride (FLOATS_PER_VERTEX = 10) so upright walls,
objects, characters, and monsters sample the lightmap at their ground footprint.
- Scene Lighting & Clear Color Parity (src/scene/act-scene.ts):
* Set canvas clear color to pure pitch black [0, 0, 0] when lighting is enabled,
eliminating #08080a diamond void bands around cave boundaries.
* Scale light radii by SUB_TILES_PER_LIGHT_CELL (8 sub-tiles per cell: player torch 88).
* Register Objects.txt Lit0..2 emitters (TO, T1, T2, FB, B2, WP, SH, etc.) for cave torches.
* Map all spell skillIds (including Glacial Spike '55') for dynamic projectile lighting.
troytt