Added Unity project files

Packages/com.vrchat.base/Runtime/VRCSDK/Dependencies/VRChat/Scripts/MaterialFallback/FallbackMaterialCache.cs

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+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+public class FallbackMaterialCache
+{
+    private readonly Dictionary<Material, Material> _fallbackMaterialCache = new Dictionary<Material, Material>();
+
+    public void AddFallbackMaterial(Material material, Material fallbackMaterial)
+    {
+        if(!_fallbackMaterialCache.ContainsKey(material))
+        {
+            _fallbackMaterialCache.Add(material, fallbackMaterial);
+        }
+        else
+        {
+#pragma warning disable RS0030 // Banned APIs
+            Debug.LogError($"Attempted to add a duplicate fallback material '{fallbackMaterial.name}' for original material '{material.name}'.");
+#pragma warning restore RS0030
+        }
+    }
+
+    public bool TryGetFallbackMaterial(Material material, out Material fallbackMaterial)
+    {
+        if(material != null)
+        {
+            return _fallbackMaterialCache.TryGetValue(material, out fallbackMaterial);
+        }
+
+        fallbackMaterial = null;
+        return false;
+    }
+
+    public void Clear()
+    {
+        Material[] cachedFallbackMaterials = _fallbackMaterialCache.Values.ToArray();
+        for(int i = cachedFallbackMaterials.Length - 1; i >= 0; i--)
+        {
+            if (Application.isPlaying)
+            {
+                Object.Destroy(cachedFallbackMaterials[i]);
+            }
+            else
+            {
+                Object.DestroyImmediate(cachedFallbackMaterials[i]);
+            }
+        }
+
+        _fallbackMaterialCache.Clear();
+    }
+}

Packages/com.vrchat.base/Runtime/VRCSDK/Dependencies/VRChat/Scripts/MaterialFallback/FallbackMaterialCache.cs.meta

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