From 72775a80bfbcc1b7c7ab06827f1caf6722195a9d Mon Sep 17 00:00:00 2001
From: ackwell <saxon@ackwell.com.au>
Date: Sat, 27 Jan 2024 14:08:56 +1100
Subject: [PATCH] Ignore invalid attributes on export

---
 Penumbra/Import/Models/Export/MeshExporter.cs | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/Penumbra/Import/Models/Export/MeshExporter.cs b/Penumbra/Import/Models/Export/MeshExporter.cs
index 5347b87d..1a06acd1 100644
--- a/Penumbra/Import/Models/Export/MeshExporter.cs
+++ b/Penumbra/Import/Models/Export/MeshExporter.cs
@@ -230,10 +230,19 @@ public class MeshExporter
             { "targetNames", shapeNames },
         });
 
-        var attributes = Enumerable.Range(0, 32)
-            .Where(index => ((attributeMask >> index) & 1) == 1)
-            .Select(index => _mdl.Attributes[index])
-            .ToArray();
+        string[] attributes = [];
+        var maxAttribute = 31 - BitOperations.LeadingZeroCount(attributeMask);
+        if (maxAttribute < _mdl.Attributes.Length)
+        {
+            attributes = Enumerable.Range(0, 32)
+                .Where(index => ((attributeMask >> index) & 1) == 1)
+                .Select(index => _mdl.Attributes[index])
+                .ToArray();
+        }
+        else
+        {
+            _notifier.Warning($"Invalid attribute data, ignoring.");
+        }
 
         return new MeshData
         {