Finished up most documentation

spikes/card-harness/src/main.ts

@@ -720,6 +720,8 @@ async function preparePack() {
   packLoading = true
   packError = undefined
   updatePackUI()
+  let preparedPack: PackOpening | undefined
+  let textures: THREE.Texture[] = []
   try {
     // Separate texture ownership keeps local artwork, experiments and fixture disposal independent.
     const paths = [fixtureAssets.David.artwork, fixtureAssets.David.mask,
@@ -732,12 +734,12 @@ async function preparePack() {
       }
       throw failure.reason
     }
-    const textures = results.map((result, index) => {
+    textures = results.map((result, index) => {
       if (result.status !== 'fulfilled') throw new Error(`Missing pack asset: ${paths[index]}`)
       configureFrontTexture(result.value, index % 2 ? THREE.NoColorSpace : THREE.SRGBColorSpace)
       return result.value
     })
-    pack = new PackOpening({
+    preparedPack = new PackOpening({
       canvas,
       textures: {
         David: { artwork: textures[0], mask: textures[1] },
@@ -749,12 +751,24 @@ async function preparePack() {
       lightPosition,
       onChange: () => { packUIDirty = true },
     })
-    scene.add(pack.root)
-    pack.syncLighting(frontMaterial)
-    pack.setActive(mode === 'Pack')
-    pack.resize(canvas.clientWidth, canvas.clientHeight)
+    preparedPack.resize(canvas.clientWidth, canvas.clientHeight)
+    let preparedEnvironment: THREE.Texture | null
+    let preparedLightType: LightType
+    do {
+      preparedEnvironment = scene.environment
+      preparedLightType = controls.lightType
+      preparedPack.syncLighting(frontMaterial)
+      await preparedPack.prepareGPU(renderer, scene)
+    } while (scene.environment !== preparedEnvironment || controls.lightType !== preparedLightType)
+    preparedPack.syncLighting(frontMaterial)
+    preparedPack.resize(canvas.clientWidth, canvas.clientHeight)
+    preparedPack.setActive(mode === 'Pack')
+    scene.add(preparedPack.root)
+    pack = preparedPack
   } catch (error) {
-    packError = `Pack assets unavailable: ${error instanceof Error ? error.message : String(error)}`
+    preparedPack?.dispose()
+    for (const texture of textures) texture.dispose()
+    packError = `Pack unavailable: ${error instanceof Error ? error.message : String(error)}`
     console.error('Could not prepare pack prototype', error)
   } finally {
     packLoading = false