feat: daybreak finale turns the contact arrival into a sunrise with a dawn chord

src/scene/world/horizon-air.ts

@@ -9,6 +9,7 @@ export function createHorizonAir(resources: SceneResourceBag) {
   const uniforms = {
     uTime: { value: 0 },
     uWarmth: { value: 0 },
+    uDawn: { value: 0 },
     uColor: { value: new THREE.Color(0xc5646b) },
   };
   const material = resources.own(
@@ -22,6 +23,7 @@ export function createHorizonAir(resources: SceneResourceBag) {
       fragmentShader: `
       uniform float uTime;
       uniform float uWarmth;
+      uniform float uDawn;
       uniform vec3 uColor;
       varying vec2 vUv;
       void main(){
@@ -32,7 +34,7 @@ export function createHorizonAir(resources: SceneResourceBag) {
         float colorWave=0.5+0.5*sin(vUv.x*7.0+uTime*0.035);
         vec3 color=mix(uColor,vec3(0.27,0.045,0.75),colorWave*0.55);
         color=mix(color,vec3(0.05,0.52,0.75),smoothstep(0.54,0.82,vUv.y)*0.3);
-        gl_FragColor=vec4(color,(ribbon*0.16+thin*0.032)*horizontal*(0.7+uWarmth*0.3));
+        gl_FragColor=vec4(color,(ribbon*0.16+thin*0.032)*horizontal*(0.7+uWarmth*0.3)*(1.0+uDawn));
         #include <tonemapping_fragment>
         #include <colorspace_fragment>
       }
@@ -53,8 +55,10 @@ export function createHorizonAir(resources: SceneResourceBag) {
   }
   return {
     group,
-    update(palette: Readonly<MutableChapterPalette>, time: number) {
+    /** dawn: END OF SHIFT, the air masses catch first light (gain up to 2x). */
+    update(palette: Readonly<MutableChapterPalette>, time: number, dawn = 0) {
       uniforms.uTime.value = time;
+      uniforms.uDawn.value = Number.isFinite(dawn) ? Math.min(1, Math.max(0, dawn)) : 0;
       uniforms.uWarmth.value = palette.warmth;
       uniforms.uColor.value.copy(palette.sun);
     },