From 2b6717a4c1ecc069e3f1b3f6c2916b342c4423fd Mon Sep 17 00:00:00 2001
From: Baran Kahyaoglu <baran.kahyaoglu@mapbox.com>
Date: Thu, 19 Mar 2026 15:19:18 +0300
Subject: [PATCH 1/2] add OnBeforeDisposeVolatileData virtual method

add OnBeforeDisposeVolatileData virtual method to support extensibility in gltfimport subclasses
---
 .../Runtime/Scripts/GltfImport.cs                        | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Packages/com.unity.cloud.gltfast/Runtime/Scripts/GltfImport.cs b/Packages/com.unity.cloud.gltfast/Runtime/Scripts/GltfImport.cs
index 9205c7967..42f0d03a0 100755
--- a/Packages/com.unity.cloud.gltfast/Runtime/Scripts/GltfImport.cs
+++ b/Packages/com.unity.cloud.gltfast/Runtime/Scripts/GltfImport.cs
@@ -3086,11 +3086,20 @@ static string GetUniqueNodeName(RootBase gltf, uint index, ICollection<string> e
             return name;
         }
 
+        /// <summary>
+        /// Called at the beginning of <see cref="DisposeVolatileData"/> before buffers are freed.
+        /// Override to process import addon instances while data is still accessible.
+        /// </summary>
+        /// <param name="importInstances">The import addon instances dictionary, may be null.</param>
+        protected virtual void OnBeforeDisposeVolatileData(Dictionary<Type, ImportAddonInstance> importInstances) { }
+
         /// <summary>
         /// Free up volatile loading resources
         /// </summary>
         async Task DisposeVolatileData()
         {
+            OnBeforeDisposeVolatileData(m_ImportInstances);
+
             m_Buffers = null;
             m_BinChunks = null;
 

From 1e8293428006542908c8b5f664099f04c9399851 Mon Sep 17 00:00:00 2001
From: Baran Kahyaoglu <baran.kahyaoglu@mapbox.com>
Date: Thu, 19 Mar 2026 16:30:49 +0300
Subject: [PATCH 2/2] remove dictionary parameter

remove dictionary parameter OnBeforeDisposeVolatileData as subclasses can get addons using GetImportAddonInstance method
---
 .../com.unity.cloud.gltfast/Runtime/Scripts/GltfImport.cs  | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/Packages/com.unity.cloud.gltfast/Runtime/Scripts/GltfImport.cs b/Packages/com.unity.cloud.gltfast/Runtime/Scripts/GltfImport.cs
index 42f0d03a0..5b8b0187b 100755
--- a/Packages/com.unity.cloud.gltfast/Runtime/Scripts/GltfImport.cs
+++ b/Packages/com.unity.cloud.gltfast/Runtime/Scripts/GltfImport.cs
@@ -3088,17 +3088,16 @@ static string GetUniqueNodeName(RootBase gltf, uint index, ICollection<string> e
 
         /// <summary>
         /// Called at the beginning of <see cref="DisposeVolatileData"/> before buffers are freed.
-        /// Override to process import addon instances while data is still accessible.
+        /// Override to process data while it is still accessible.
         /// </summary>
-        /// <param name="importInstances">The import addon instances dictionary, may be null.</param>
-        protected virtual void OnBeforeDisposeVolatileData(Dictionary<Type, ImportAddonInstance> importInstances) { }
+        protected virtual void OnBeforeDisposeVolatileData() { }
 
         /// <summary>
         /// Free up volatile loading resources
         /// </summary>
         async Task DisposeVolatileData()
         {
-            OnBeforeDisposeVolatileData(m_ImportInstances);
+            OnBeforeDisposeVolatileData();
 
             m_Buffers = null;
             m_BinChunks = null;