Fix: Fade glowing camouflage parts with the lights

Unlit `Textured` materials loaded as `MeshBasicMaterial`, so they stayed bright while the lights receded during a camouflage switch (E 100 legendary camouflage).

- `Textured` materials now export as standard materials with the base color texture as emissive and a black base color, so they look the same as before.
- The Tankopedia model fades their emissive intensity with the lighting transition.
- Additive blending applies to these parts again, since they are standard materials.

packages/website/src/components/Tankopedia/HeroSection/components/TankSandbox/components/TankModel.tsx

@@ -1,5 +1,6 @@
 import { invalidate, useThree, type ThreeEvent } from "@react-three/fiber";
-import { useRef } from "react";
+import type { QuicklimeEvent } from "quicklime";
+import { useEffect, useRef } from "react";
 import { Group, Mesh, MeshStandardMaterial, Vector2 } from "three";
 import { applyPitchYawLimits } from "../../../../../../core/blitz/applyPitchYawLimits";
 import { hasEquipment } from "../../../../../../core/blitzkit/hasEquipment";
@@ -14,6 +15,7 @@ import { Duel } from "../../../../../../stores/duel";
 import { Tankopedia } from "../../../../../../stores/tankopedia";
 import { TankopediaDisplay } from "../../../../../../stores/tankopediaPersistent/constants";
 import { ModelTankWrapper } from "../../../../../Armor/components/ModelTankWrapper";
+import { transitionEvent } from "./Lighting";
 
 export function TankModel() {
   const protagonist = Duel.use((draft) => draft.protagonist);
@@ -35,6 +37,40 @@ export function TankModel() {
 
   useTankTransform(track, turret, turretContainer, gunContainer);
 
+  useEffect(() => {
+    const emissiveMaterials = new Set<MeshStandardMaterial>();
+
+    for (const scene of [gltf.scene, ...skins.map((skin) => skin.scene)]) {
+      scene.traverse((object) => {
+        if (
+          object instanceof Mesh &&
+          object.material instanceof MeshStandardMaterial &&
+          object.material.emissiveMap
+        ) {
+          emissiveMaterials.add(object.material);
+        }
+      });
+    }
+
+    // emissive parts fade with the lights instead of glowing in the dark
+    function applyIntensity(intensity: number) {
+      for (const material of emissiveMaterials) {
+        material.emissiveIntensity = intensity;
+      }
+    }
+
+    function handleTransitionEvent(event: QuicklimeEvent<number>) {
+      applyIntensity(event.data);
+    }
+
+    applyIntensity(transitionEvent.last!);
+    transitionEvent.on(handleTransitionEvent);
+
+    return () => {
+      transitionEvent.off(handleTransitionEvent);
+    };
+  }, [gltf, skinGltf, attachmentGltf]);
+
   return (
     <ModelTankWrapper ref={hullContainer}>
       {nodes.map((node) => {

packages/website/src/pages/[...chunk_models_tanks]/[id]/model.glb.ts

@@ -14,7 +14,7 @@ import {
 } from "@blitzkit/core";
 import type { AbstractVFS } from "@blitzkit/core/src/blitzkit/vfs/abstract";
 import { Document, Material, Node, NodeIO, Scene } from "@gltf-transform/core";
-import { ALL_EXTENSIONS, KHRMaterialsUnlit } from "@gltf-transform/extensions";
+import { ALL_EXTENSIONS } from "@gltf-transform/extensions";
 import { dedup, prune } from "@gltf-transform/functions";
 import type { APIContext } from "astro";
 import { isEqual, times } from "lodash-es";
@@ -366,10 +366,11 @@ export async function extractMaterials(
       }
 
       if (fxName?.endsWith("/Textured.material")) {
-        material.setExtension(
-          "KHR_materials_unlit",
-          document.createExtension(KHRMaterialsUnlit).createUnlit(),
-        );
+        // unlit in game, emissive so the viewer can fade it with the lights
+        material
+          .setEmissiveTexture(material.getBaseColorTexture())
+          .setEmissiveFactor([1, 1, 1])
+          .setBaseColorFactor([0, 0, 0, 1]);
       }
 
       if (textures.miscMap) {