MONKEY (fix-wet): seamless ripple wrap, no dry-weather churn, no sheen NaN, windows stay lit

Review B3: floor(cycle) % 50 keeps the ring roll continuous across the 1000 s
wrap. B8: publish the ripple clock only while it rains. B7: nudge the wet
sheen half-vector off zero. B6: WORD_WINDOW batches are excluded from wet
darkening.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/benilla-assets/src/shaders/enhanced_water.wgsl

@@ -279,7 +279,9 @@ fn rain_ripple_normal(world_xz: vec2<f32>, footprint: f32, distance: f32, room:
                 let h_alt = ripple_hash(seed + 19.19);
                 // Each period re-rolls whether this cell rains, so the pattern does not repeat.
                 let cycle = wet_row.z * rate + h.x;
-                let roll = ripple_hash(seed + floor(cycle) * 7.31).x;
+                // MONKEY (fix-wet): `% 50` keeps the roll sequence continuous across the 1000 s
+                // clock wrap (cycle drops by 800 / 650, both multiples of 50).
+                let roll = ripple_hash(seed + (floor(cycle) % 50.0) * 7.31).x;
                 if roll > rain * 0.85 {
                     continue;
                 }

crates/benilla-assets/src/shaders/wet_hook.wgsl

@@ -86,7 +86,8 @@ fn wet_sheen(boost: f32, n: vec3<f32>, to_view: vec3<f32>, to_light: vec3<f32>,
     if (boost <= 0.0) {
         return vec3<f32>(0.0);
     }
-    let h = normalize(to_light + to_view);
+    // MONKEY (fix-wet): nudged so opposite light/view vectors never normalize a zero vector (NaN).
+    let h = normalize(to_light + to_view + vec3<f32>(0.0, 1.0e-4, 0.0));
     let nl = max(dot(n, to_light), 0.0);
     let spec = pow(max(dot(n, h), 0.0), 80.0) * smoothstep(0.0, 0.15, nl);
     let fres = 0.03 + 0.97 * pow(1.0 - clamp(dot(n, to_view), 0.0, 1.0), 5.0);

crates/benilla-world/src/shaders/static_gx.wgsl

@@ -1995,7 +1995,9 @@ fn fragment(in: GxVsOut) -> @location(0) vec4<f32> {
     }
     // MONKEY (wet): rain on sky-exposed surfaces (wet_hook.wgsl); interior, unlit and dry = untouched.
     let wet = wet_hook::wet_surface(rgb, n_lit, in.world_position.xyz,
-        select(1.0, 0.0, (in.word & (WORD_INTERIOR | WORD_UNLIT)) != 0u), wow_light.monkey);
+        // MONKEY (fix-wet): lit WMO windows (WORD_WINDOW) are not darkened by rain either.
+        select(1.0, 0.0, (in.word & (WORD_INTERIOR | WORD_UNLIT | WORD_WINDOW)) != 0u),
+        wow_light.monkey);
     rgb = wet.albedo;
     if (wet.boost > 0.0) {
         rgb = min(rgb + wet_hook::wet_sheen(wet.boost, n_lit, normalize(view.world_position - in.world_position.xyz),

crates/benilla-world/src/weather/wetness.rs

@@ -104,7 +104,10 @@ fn wetness_tick(
         (
             rain,
             env.wetness.unwrap_or(wet.wetness),
-            env.ripple_t.unwrap_or(wet.ripple_time_s),
+            // MONKEY (fix-wet): the rings read the clock only while it rains; publishing it when
+            // dry rewrote the shared light buffer every frame in clear weather.
+            env.ripple_t
+                .unwrap_or(if rain > 0.0 { wet.ripple_time_s } else { 0.0 }),
         )
     } else {
         (0.0, 0.0, 0.0)