From 81a0ca5e7ab0c41ee51808fd17c826906bf85075 Mon Sep 17 00:00:00 2001
From: linkong <linkong@example.com>
Date: Tue, 24 Mar 2026 12:10:52 +0800
Subject: [PATCH] fix(satellites): fix back-facing detection with proper
 coordinate transform

---
 frontend/public/earth/js/satellites.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/frontend/public/earth/js/satellites.js b/frontend/public/earth/js/satellites.js
index 95a733f1..597ed25a 100644
--- a/frontend/public/earth/js/satellites.js
+++ b/frontend/public/earth/js/satellites.js
@@ -423,10 +423,11 @@ export function isSatelliteFrontFacing(index, camera) {
   const satPos = positions[index].current;
   if (!satPos) return true;
   
+  const worldSatPos = satPos.clone().applyMatrix4(earthObjRef.matrixWorld);
   const toCamera = new THREE.Vector3().subVectors(camera.position, earthObjRef.position).normalize();
-  const toSat = new THREE.Vector3().subVectors(satPos, earthObjRef.position).normalize();
+  const toSat = new THREE.Vector3().subVectors(worldSatPos, earthObjRef.position).normalize();
   
-  return toCamera.dot(toSat) < 0;
+  return toCamera.dot(toSat) > 0;
 }
 
 let earthObjRef = null;