From d4ccff6342434e63b4244b00bd7a144192df2aa2 Mon Sep 17 00:00:00 2001
From: Andreas Wilms <andreas.wilms@uni-a.de>
Date: Mon, 9 Mar 2026 14:18:49 +0100
Subject: [PATCH] lod export

---
 app/page.tsx                    |  14 +++--
 app/workers/converter.worker.ts | 103 +++++++++++++++++++++++++-------
 2 files changed, 89 insertions(+), 28 deletions(-)

diff --git a/app/page.tsx b/app/page.tsx
index 2586607..52ba79b 100644
--- a/app/page.tsx
+++ b/app/page.tsx
@@ -8,8 +8,6 @@ export default function XgridsWizard() {
   const workerRef = useRef<Worker | null>(null);
 
   useEffect(() => {
-    // 1. Point to the NEW location in the /app folder
-    // Next.js recognizes the 'new URL' pattern and bundles it as a separate worker
     const worker = new Worker(
       new URL("./workers/converter.worker.ts", import.meta.url),
     );
@@ -18,11 +16,17 @@ export default function XgridsWizard() {
     worker.onmessage = (e) => {
       const { type, message, data } = e.data;
       if (type === "LOG") setStatus(message);
+
       if (type === "DONE") {
         setIsProcessing(false);
-        setStatus("Conversion Complete!");
-        downloadFile(data.sog, `${data.fileName}.sog`);
-        // Removed: downloadFile(data.ply, ...) — worker doesn't produce a PLY
+        setStatus(
+          `Conversion Complete! Downloading ${data.files.length} files...`,
+        );
+
+        // Loop through all generated files and trigger downloads
+        data.files.forEach((file: { name: string; blob: Blob }) => {
+          downloadFile(file.blob, file.name);
+        });
       }
     };
 
diff --git a/app/workers/converter.worker.ts b/app/workers/converter.worker.ts
index 0452bd2..b8bb865 100644
--- a/app/workers/converter.worker.ts
+++ b/app/workers/converter.worker.ts
@@ -41,13 +41,16 @@ self.onmessage = async (e: MessageEvent) => {
     try {
       self.postMessage({ type: "LOG", message: "Initialisiere..." });
 
-      // Fetch the WASM binary ourselves and inject it
-      const wasmResponse = await fetch("/workers/webp.wasm");
-      const wasmBinary = await wasmResponse.arrayBuffer();
-
-      // Inject before the module loads
+      // Emscripten's native locateFile hook
       // @ts-ignore
-      globalThis.Module = { wasmBinary };
+      globalThis.Module = globalThis.Module || {};
+      // @ts-ignore
+      globalThis.Module.locateFile = function (path: string) {
+        if (path.endsWith(".wasm")) {
+          return new URL("/webp.wasm", self.location.origin).href;
+        }
+        return path;
+      };
 
       const {
         readFile,
@@ -55,7 +58,6 @@ self.onmessage = async (e: MessageEvent) => {
         MemoryReadFileSystem,
         MemoryFileSystem,
         getInputFormat,
-        getOutputFormat,
       } = await import("@playcanvas/splat-transform");
 
       const readFs = new MemoryReadFileSystem();
@@ -69,9 +71,9 @@ self.onmessage = async (e: MessageEvent) => {
         readFs.set(file.name, new Uint8Array(file.buffer));
       }
 
-      const fullOptions = {
+      const readOptions = {
         iterations: 0,
-        lodSelect: [0],
+        lodSelect: [0, 1, 2, 3, 4], // we have captured a total level of 5
         unbundled: false,
         lodChunkCount: 0,
         lodChunkExtent: 0,
@@ -84,37 +86,92 @@ self.onmessage = async (e: MessageEvent) => {
         fileSystem: readFs,
         inputFormat: getInputFormat(mainLccName),
         params: [],
-        options: fullOptions,
+        options: readOptions,
       });
 
       const mainTable = tables[0];
       if (!mainTable) throw new Error("Keine Splat-Daten gefunden.");
 
-      self.postMessage({ type: "LOG", message: "Kompiliere SOG..." });
+      const generatedFiles: { name: string; blob: Blob }[] = [];
 
-      const writeFs = new MemoryFileSystem();
-      const outputName = `${fileName}.sog`;
+      // PASS 1: Generate Single High-Quality SOG
+      self.postMessage({ type: "LOG", message: "Kompiliere Single SOG..." });
+
+      const writeFsSingle = new MemoryFileSystem();
+      const singleOutputName = `${fileName}.sog`;
+      const singleOptions = {
+        ...readOptions,
+        iterations: 10,
+        unbundled: false,
+      };
 
       await writeFile(
         {
-          filename: outputName,
-          outputFormat: getOutputFormat(outputName, fullOptions),
+          filename: singleOutputName,
+          outputFormat: "sog",
           dataTable: mainTable,
-          options: { ...fullOptions, iterations: 8 },
+          options: singleOptions,
         },
-        writeFs,
+        writeFsSingle,
       );
 
-      const sogData = writeFs.results.get(outputName);
-      if (!sogData) throw new Error("SOG-Erstellung fehlgeschlagen.");
+      const singleSogData = writeFsSingle.results.get(singleOutputName);
+      if (singleSogData) {
+        generatedFiles.push({
+          name: singleOutputName,
+          blob: new Blob([new Uint8Array(singleSogData).slice().buffer], {
+            type: "application/octet-stream",
+          }),
+        });
+      }
 
+      // ==========================================
+      // PASS 2: Generate Unbundled LOD SOGs + JSON
+      // ==========================================
+      self.postMessage({ type: "LOG", message: "Kompiliere LOD Chunks..." });
+
+      const writeFsLods = new MemoryFileSystem();
+
+      // MUST be exactly "meta.json" for unbundled SOG format
+      const lodsOutputName = "meta.json";
+
+      const lodOptions = {
+        ...readOptions,
+        iterations: 10,
+        unbundled: true,
+        lodChunkCount: 512,
+        lodChunkExtent: 16,
+      };
+
+      await writeFile(
+        {
+          filename: lodsOutputName,
+          outputFormat: "sog",
+          dataTable: mainTable,
+          options: lodOptions,
+        },
+        writeFsLods,
+      );
+
+      // Jetzt iterieren wir über alle generierten Dateien im System
+      for (const [generatedName, data] of writeFsLods.results.entries()) {
+        const mimeType = generatedName.endsWith(".json")
+          ? "application/json"
+          : "application/octet-stream";
+
+        generatedFiles.push({
+          name: generatedName,
+          blob: new Blob([new Uint8Array(data).slice().buffer], {
+            type: mimeType,
+          }),
+        });
+      }
+
+      // Send all Data to Frontend
       self.postMessage({
         type: "DONE",
         data: {
-          sog: new Blob([new Uint8Array(sogData).slice().buffer], {
-            type: "application/octet-stream",
-          }),
-          fileName,
+          files: generatedFiles,
         },
       });
     } catch (err: any) {