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

src/scene/world/terrain.ts

@@ -1,5 +1,6 @@
 import * as THREE from 'three';
 import { BEAM_PARS, beamUniforms } from './headlights';
+import { DAWN_PARS, dawnLightUniforms } from './dawn-light';
 import type { EnvironmentChapter } from '@/journey/types';
 import type { RenderQualitySettings } from '@/scene/render-quality';
 import type { SceneResourceBag } from '@/scene/resources';
@@ -236,7 +237,7 @@ export function createTerrain(
   const groundMaterial = resources.own(
     'material',
     new THREE.ShaderMaterial({
-      uniforms: { ...uniforms, ...beamUniforms },
+      uniforms: { ...uniforms, ...beamUniforms, ...dawnLightUniforms },
       vertexShader: material.vertexShader.replace(
         'displaced.y += height + 0.028;',
         'displaced.y += height - 0.12;',
@@ -251,6 +252,7 @@ export function createTerrain(
       varying vec3 vTerrainPosition;
       varying vec3 vGridColor;
       ${BEAM_PARS}
+      ${DAWN_PARS}
       void main() {
         vec3 normal = normalize(cross(dFdx(vTerrainPosition), dFdy(vTerrainPosition)));
         float light = abs(dot(normal, normalize(vec3(-0.5, 0.8, -0.3))));
@@ -259,6 +261,8 @@ export function createTerrain(
         // HIGH BEAM: the ridges beside the road catch the headlights.
         float beam = headlightBeam(vTerrainPosition);
         color += vec3(1.0, 0.84, 0.66) * beam * (0.3 + 0.7 * abs(dot(normal, normalize(uBeamOrigin - vTerrainPosition)))) * 0.28;
+        // END OF SHIFT: the ridges catch first light from the low sun ahead.
+        color += dawnRim(normal, normalize(cameraPosition - vTerrainPosition));
         color = mix(uFogColor * 0.55, color, vDepthFade);
         gl_FragColor = vec4(color, 1.0);
         #include <tonemapping_fragment>