diff --git a/CMakeLists.txt b/CMakeLists.txt
index 50d5efb..b8356aa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,6 +31,7 @@ add_executable(Moer
   src/FunctionLayer/Acceleration/Acceleration.cpp
   src/FunctionLayer/Acceleration/EmbreeBVH.cpp
   src/FunctionLayer/Acceleration/Linear.cpp
+  src/FunctionLayer/Acceleration/Octree.cpp
 
   src/FunctionLayer/Integrator/NormalIntegrator.cpp
   src/FunctionLayer/Integrator/DirectIntegrator.cpp
diff --git a/README.md b/README.md
index c102a51..6e14c10 100644
--- a/README.md
+++ b/README.md
@@ -13,11 +13,12 @@ Moer-lite的框架基于Moer主干：https://github.com/NJUCG/Moer .
 请参考Lab0的编译使用过程。
 
 ## 示例场景
-目前有四个示例场景：
+目前有五个示例场景：
 - `examples/area-lights`：提供了一个面光源照亮一个Stanford bunny的场景；
 - `examples/two-spotlights`：提供了一个有着两个点光源的场景；
 - `examples/bunny`：提供了一个使用环境光（environment lighting）照亮Stanford bunny的场景。
 - `examples/cornell-box`：提供了一个使用whitted-style ray tracing的cornell-box场景
+- `examples/lab1-test0`：提供了一个简单的mesh场景用来进行求交测试
 ## BUG反馈
 
 如果发现Moer-lite框架存在bug，或者有任何架构上的改进意见，任何更好的第三方库……
diff --git a/src/FunctionLayer/Acceleration/Octree.cpp b/src/FunctionLayer/Acceleration/Octree.cpp
index a77fed1..647158e 100644
--- a/src/FunctionLayer/Acceleration/Octree.cpp
+++ b/src/FunctionLayer/Acceleration/Octree.cpp
@@ -11,7 +11,7 @@ OctreeAcceleration::OctreeAcceleration() {
 }
 
 OctreeAcceleration::~OctreeAcceleration() {
-  // do nothing
+  //
 }
 
 void OctreeAcceleration::build() {