diff --git a/03-UnrealEngine/Rendering/RenderFeature/UE5 3DGaussians 插件笔记.md b/03-UnrealEngine/Rendering/RenderFeature/UE5 3DGaussians 插件笔记.md
index a06764d..4ae6efd 100644
--- a/03-UnrealEngine/Rendering/RenderFeature/UE5 3DGaussians 插件笔记.md	
+++ b/03-UnrealEngine/Rendering/RenderFeature/UE5 3DGaussians 插件笔记.md	
@@ -8,6 +8,10 @@ rating: ⭐
 
 # c++
 插件的c++部分主要实现了
+- FThreeDGaussians——可以理解为一个场景或者根节点
+	- FThreeDGaussiansTree——类似BVH的空间切分树
+	- FThreeDGaussiansData——具体数据
+- 
 
 
 
@@ -16,10 +20,8 @@ rating: ⭐
 struct FThreeDGaussiansData
 {
 	GENERATED_BODY()
-
 public:
 	FThreeDGaussiansData() {}
-
 	FThreeDGaussiansData(const TArray<UTexture2D*>& textures, const FVector3f& in_minPos, const FVector3f& in_maxPos)
 	{
 		minPos = in_minPos;
@@ -43,4 +45,38 @@ public:
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians") UTexture2D* scaleAndOpacity;
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians") TArray<UTexture2D*> sh;
 };
+
+/** 类似BVH的控件数据结构 */
+USTRUCT(BlueprintType)
+struct FThreeDGaussiansTree
+{
+	GENERATED_BODY()
+public:
+	FThreeDGaussiansTree() {}
+
+	// Axis for split (x=0, y=1, z=2)
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians")	int32 splitAxis = -1;
+	// max value of the position of gaussian in child0 or leaf0 in "splitAxis" axis
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians")	float splitValue = 0.0f;
+
+	// index of child tree node (Index of TArray<FThreeDGaussiansTree> tree)
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians")	int32 childIndex0 = -1;
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians")	int32 childIndex1 = -1;
+
+	// index of child data node (Index of TArray<FThreeDGaussiansData> data)
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians")	int32 leafIndex0 = -1;
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians")	int32 leafIndex1 = -1;
+};
+
+/* 作为3D高斯数据的载荷 */
+USTRUCT(BlueprintType)
+struct FThreeDGaussians
+{
+	GENERATED_BODY()
+public:
+	FThreeDGaussians() {}
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians") TArray<FThreeDGaussiansData> data;
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "3D Gaussians") TArray<FThreeDGaussiansTree> tree;
+};
 ```
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