feat: layer the nightdrive sky and atmosphere

src/scene/world/terrain.ts

@@ -2,7 +2,7 @@ import * as THREE from 'three';
 import type { EnvironmentChapter } from '@/journey/types';
 import type { RenderQualitySettings } from '@/scene/render-quality';
 import type { SceneResourceBag } from '@/scene/resources';
-import { CHAPTER_PALETTES } from '@/scene/world/palette';
+import { CHAPTER_PALETTES, type MutableChapterPalette } from '@/scene/world/palette';
 
 export interface TerrainWorld {
   group: WorldGroup;
@@ -11,6 +11,7 @@ export interface TerrainWorld {
     speed: number,
     chapter: EnvironmentChapter,
     routeProgress: number,
+    palette?: Readonly<MutableChapterPalette>,
   ): void;
 }
 
@@ -131,14 +132,19 @@ export function createTerrain(
 
   return {
     group,
-    update(distance, speed, chapter, routeProgress) {
-      const palette = CHAPTER_PALETTES[chapter];
+    update(distance, speed, chapter, routeProgress, palette) {
+      const chapterPalette = CHAPTER_PALETTES[chapter];
       uniforms.uDistance.value = finiteOrZero(distance);
       uniforms.uSpeed.value = clamp01(speed);
       uniforms.uRouteProgress.value = clamp01(routeProgress);
-      uniforms.uTerrainEnergy.value = palette.terrainEnergy;
-      lowColor.setHex(palette.terrainLow);
-      highColor.setHex(palette.terrainHigh);
+      uniforms.uTerrainEnergy.value = palette?.terrainEnergy ?? chapterPalette.terrainEnergy;
+      if (palette) {
+        lowColor.copy(palette.terrainLow);
+        highColor.copy(palette.terrainHigh);
+      } else {
+        lowColor.setHex(chapterPalette.terrainLow);
+        highColor.setHex(chapterPalette.terrainHigh);
+      }
     },
   };
 }