From 0b63bbfed3822c5900feec327962bdd0732da8f0 Mon Sep 17 00:00:00 2001
From: Andreas Wilms <andreas.wilms@uni-a.de>
Date: Mon, 9 Mar 2026 16:39:07 +0100
Subject: [PATCH] full conversion for environment

---
 app/workers/converter.worker.ts | 52 +++++++++++++++++++++++++++++----
 1 file changed, 46 insertions(+), 6 deletions(-)

diff --git a/app/workers/converter.worker.ts b/app/workers/converter.worker.ts
index 9f3b5fd..46beb5d 100644
--- a/app/workers/converter.worker.ts
+++ b/app/workers/converter.worker.ts
@@ -49,22 +49,62 @@ function parseLci(buffer: ArrayBuffer): Blob {
 /**
  * Converts XGrids environment.bin to PlayCanvas Gaussian Splat PLY
  */
+/**
+ * Converts XGrids environment.bin to a Full Gaussian Splatting PLY
+ * Extracts: Position, Scale, Rotation (Quaternions), and Opacity
+ */
 function parseEnvironment(buffer: ArrayBuffer): Blob {
   const view = new DataView(buffer);
-  const POINT_SIZE = 44;
+  const POINT_SIZE = 44; // 11 floats * 4 bytes
   const numPoints = Math.floor(buffer.byteLength / POINT_SIZE);
 
-  let ply = `ply\nformat ascii 1.0\nelement vertex ${numPoints}\nproperty float x\nproperty float y\nproperty float z\nproperty float scale_0\nproperty float scale_1\nproperty float scale_2\nproperty float rot_0\nproperty float rot_1\nproperty float rot_2\nproperty float rot_3\nproperty float opacity\nend_header\n`;
+  let plyHeader = [
+    "ply",
+    "format ascii 1.0",
+    `element vertex ${numPoints}`,
+    "property float x",
+    "property float y",
+    "property float z",
+    "property float scale_0",
+    "property float scale_1",
+    "property float scale_2",
+    "property float rot_0",
+    "property float rot_1",
+    "property float rot_2",
+    "property float rot_3",
+    "property float opacity",
+    "end_header",
+    "",
+  ].join("\n");
+
+  // 2. Extract all 11 properties for every point
+  // We use an array of strings to build the body efficiently
+  const rows: string[] = [];
 
   for (let i = 0; i < numPoints; i++) {
     const offset = i * POINT_SIZE;
-    const row = [];
+    const pointData = [];
+
     for (let j = 0; j < 11; j++) {
-      row.push(view.getFloat32(offset + j * 4, true).toFixed(6));
+      // getFloat32(offset, littleEndian: true)
+      const val = view.getFloat32(offset + j * 4, true);
+      pointData.push(val.toFixed(6));
+    }
+
+    rows.push(pointData.join(" "));
+
+    // Periodically clear memory pressure if the scene is massive
+    if (i % 100000 === 0 && i > 0) {
+      self.postMessage({
+        type: "LOG",
+        message: `Processing Environment: ${i.toLocaleString()} splats...`,
+      });
     }
-    ply += row.join(" ") + "\n";
   }
-  return new Blob([ply], { type: "application/octet-stream" });
+
+  return new Blob([plyHeader + rows.join("\n")], {
+    type: "application/octet-stream",
+  });
 }
 
 // --- WORKER INFRASTRUCTURE ---