The grade snapped to the new zone's LUT pair on the frame `CurrentArea`
changed. `GradeBlend` now holds the current and previous pairs and fades
between them over GRADE_FADE_S = 2 s: the view binds a second day/night
pair (bindings 6, 7; identity when there is none) and `control.z` is the
current pair's weight, `control.w` the previous pair's strength. The shader
runs the previous pair through the same day/night blend at its own
strength and mixes, only while z < 1. A zone with no row fades to identity
(strength 0) instead of cutting; stepping back across the border mid-fade
reverses the fade from the image on screen. The first graded zone after
login, and a disabled grade, snap. Missing LUTs still bind the identity cube.
Verified: cargo test -p benilla-app --lib post:: (4 passed, including the
new zone_change_crossfades_and_a_quick_return_reverses); grading.wgsl
composes and validates under naga_oil 0.20 / naga 27 offline. No GPU or
WoW data here; built on Linux only.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y6yUWgPosSakvL23gtgvpH
Claude
7d2f55a014