diff --git a/samples/api/texture_loading/texture_loading.cpp b/samples/api/texture_loading/texture_loading.cpp
index bc303be..f3c0564 100644
--- a/samples/api/texture_loading/texture_loading.cpp
+++ b/samples/api/texture_loading/texture_loading.cpp
@@ -584,7 +584,7 @@ void TextureLoading::build_command_buffers()
 
 		//vkCmdDrawIndexed(draw_cmd_buffers[i], index_count, 1, 0, 0, 0);
 
-		//draw_point_cloud(draw_cmd_buffers[i]);
+		draw_point_cloud(draw_cmd_buffers[i]);
 		draw_point_cloud_line(draw_cmd_buffers[i]);
 
 		//draw_ui(draw_cmd_buffers[i]);
@@ -881,11 +881,11 @@ void TextureLoading::setup_descriptor_set_layout_point_line()
 			VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
 			VK_SHADER_STAGE_VERTEX_BIT,
 			0),
-		// Binding 1 : Fragment shader image sampler
-		vkb::initializers::descriptor_set_layout_binding(
-			VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
-			VK_SHADER_STAGE_FRAGMENT_BIT,
-			1)
+			// Binding 1 : Fragment shader image sampler
+			vkb::initializers::descriptor_set_layout_binding(
+				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
+				VK_SHADER_STAGE_FRAGMENT_BIT,
+				1)
 	};
 
 	VkDescriptorSetLayoutCreateInfo descriptor_layout =
@@ -930,13 +930,13 @@ void TextureLoading::setup_descriptor_set_point_line()
 			VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
 			0,
 			&buffer_descriptor),
-		// Binding 1 : Fragment shader texture sampler
-		//	Fragment shader: layout (binding = 1) uniform sampler2D samplerColor;
-		vkb::initializers::write_descriptor_set(
-			descriptor_set_point,
-			VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,        // The descriptor set will use a combined image sampler (sampler and image could be split)
-			1,                                                // Shader binding point 1
-			&image_descriptor)                                // Pointer to the descriptor image for our texture
+			// Binding 1 : Fragment shader texture sampler
+			//	Fragment shader: layout (binding = 1) uniform sampler2D samplerColor;
+			vkb::initializers::write_descriptor_set(
+				descriptor_set_point,
+				VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,        // The descriptor set will use a combined image sampler (sampler and image could be split)
+				1,                                                // Shader binding point 1
+				&image_descriptor)                                // Pointer to the descriptor image for our texture
 	};
 
 	vkUpdateDescriptorSets(get_device().get_handle(), static_cast<uint32_t>(write_descriptor_sets.size()), write_descriptor_sets.data(), 0, NULL);
@@ -1285,14 +1285,16 @@ void TextureLoading::prepare_pipeline_point()
 void TextureLoading::prepare_pipeline_point_line()
 {
 
+	// 顶点输入绑定描述 (告诉 Vulkan 顶点数据的格式)
 	VkVertexInputBindingDescription vertex_input_binding_description{};
-	vertex_input_binding_description.binding = 0;
-	vertex_input_binding_description.stride = sizeof(PointVertex);
+	vertex_input_binding_description.binding = 0; // 绑定点
+	vertex_input_binding_description.stride = sizeof(PointVertex); // 每个顶点的字节大小
 	vertex_input_binding_description.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
 
+	// 顶点输入属性描述 (告诉 Vulkan 每个属性在顶点结构中的位置)
 	std::array<VkVertexInputAttributeDescription, 2> vertex_input_attributes = {
-		VkVertexInputAttributeDescription{0, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(PointVertex, x)},
-		VkVertexInputAttributeDescription{1, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(PointVertex, r)}
+		VkVertexInputAttributeDescription{0, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(PointVertex, x)}, // 位置
+		VkVertexInputAttributeDescription{1, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(PointVertex, r)}  // 颜色
 	};
 
 	VkPipelineVertexInputStateCreateInfo vertex_input_state{ VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO };
@@ -1301,7 +1303,7 @@ void TextureLoading::prepare_pipeline_point_line()
 	vertex_input_state.vertexAttributeDescriptionCount = static_cast<uint32_t>(vertex_input_attributes.size());
 	vertex_input_state.pVertexAttributeDescriptions = vertex_input_attributes.data();
 
-
+	// 输入装配 (绘制点列表)
 	VkPipelineInputAssemblyStateCreateInfo input_assembly_state{ VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO };
 	input_assembly_state.topology = VK_PRIMITIVE_TOPOLOGY_LINE_STRIP;
 	input_assembly_state.primitiveRestartEnable = VK_FALSE;
@@ -1440,7 +1442,16 @@ bool TextureLoading::prepare(const vkb::ApplicationOptions& options)
 	int pointCount = sizeof(testPoint) / (3*4);
 	update_point_vertex_buffer(testPoint, pointCount);
 
-	update_point_vertex_buffer_line(testPoint, pointCount);
+	float testPoint_line[] = {
+		0,0,z,
+		-0.05,0.05,z,
+		-0.1,0.1,z,
+		-0.2,0.2,z,
+		-0.3,0.3,z,
+		-0,0.5,z,
+		-1,1,z,
+	};
+	update_point_vertex_buffer_line(testPoint_line, sizeof(testPoint_line) / (3 * 4));
 	
 	prepared = true;
 
@@ -1935,14 +1946,16 @@ void TextureLoading::update_point_vertex_buffer_line(float* pos, int count)
 {
 	std::lock_guard<std::mutex> lock(mtx_point_line);
 	if (count <= 0) {
-		point_count_line = 0;
+		count = 0;
 		return; // 没有点数据，无需更新
 	}
 
-	point_count_line = count;
+	point_count = count;
 
 	// 1. 准备顶点数据
 	std::vector<PointVertex> vertices(point_count);
+	// 假设 pos 数组是 [x0,y0,z0,x1,y1,z1,...]
+	// 为了可视化，这里简单地将坐标映射为颜色 (0-1范围)
 	float min_x = std::numeric_limits<float>::max(), max_x = std::numeric_limits<float>::lowest();
 	float min_y = std::numeric_limits<float>::max(), max_y = std::numeric_limits<float>::lowest();
 	float min_z = std::numeric_limits<float>::max(), max_z = std::numeric_limits<float>::lowest();
@@ -1989,7 +2002,7 @@ void TextureLoading::update_point_vertex_buffer_line(float* pos, int count)
 	void* mapped_data = vertex_buffer_point_line->map();
 	if (mapped_data) {
 		memcpy(mapped_data, vertices.data(), buffer_size);
-		vertex_buffer_point->unmap();
+		vertex_buffer_point_line->unmap();
 	}
 	else {
 		LOGE("Failed to map point vertex buffer for update.");