~ | BVH optimizing again

srcs/class/BVH.cpp

@@ -145,26 +145,74 @@ void BVH::flatten(std::vector<GPUBvh> &bvhs, int &currentIndex)
     bvhs[self_index] = self_bvh;
 }
 
-int	BVH::size()
-{
-	int count = 0;
-
-	if (_is_leaf)
-		return (0);
-	
-	count += 1 + _left->size();
-	count += 1 + _right->size();
-
-	return (count);
-}
-
 std::vector<GPUBvh>	BVH::getGPUBvhs()
 {
-	std::vector<GPUBvh> bvhs(size() + 1);
+	std::vector<GPUBvh> bvhs(getSize() + 1);
     
     int currentIndex = 0;
     flatten(bvhs, currentIndex);
 
 
     return (bvhs);
+}
+
+int	BVH::getSize()
+{
+	int count = 0;
+
+	if (_is_leaf)
+		return (0);
+	
+	count += 1 + _left->getSize();
+	count += 1 + _right->getSize();
+
+	return (count);
+}
+
+int	BVH::getLeaves()
+{
+	int count = 0;
+
+	if (_is_leaf)
+		return (1);
+	
+	count += _left->getLeaves();
+	count += _right->getLeaves();
+
+	return (count);
+}
+
+//get tri per leaf min max and average
+BVHStats	BVH::analyzeBVHLeaves(BVH *root)
+{
+    if (!root)
+        return {0, 0, 0.0f};
+    // If this is a leaf node, return its stats
+
+    if (root->_is_leaf)
+        return {
+            root->_primitive_count,  // min
+            root->_primitive_count,  // max
+            (float)root->_primitive_count  // average
+        };
+
+    // Get stats from left and right subtrees
+    BVHStats left = analyzeBVHLeaves(root->_left);
+    BVHStats right = analyzeBVHLeaves(root->_right);
+
+    // Combine the results
+    int min_count = std::min(left.min_triangles, right.min_triangles);
+    int max_count = std::max(left.max_triangles, right.max_triangles);
+    
+    // Calculate weighted average based on number of leaves in each subtree
+    float left_leaf_count = (left.average_triangles > 0) ? 1.0f : 0.0f;
+    float right_leaf_count = (right.average_triangles > 0) ? 1.0f : 0.0f;
+    float total_leaf_count = left_leaf_count + right_leaf_count;
+    
+    float avg_count = 0.0f;
+    if (total_leaf_count > 0)
+        avg_count = (left.average_triangles * left_leaf_count + 
+                    right.average_triangles * right_leaf_count) / total_leaf_count;
+
+    return {min_count, max_count, avg_count};
 }

srcs/class/Scene.cpp

@@ -64,8 +64,15 @@ bool		Scene::parseScene(char *name)
 	BVH *bvh = new BVH(_gpu_triangles, 0, _gpu_triangles.size());
 	_gpu_bvh = bvh->getGPUBvhs();
 	
-	std::cout << "BVH Done: " << bvh->size() << std::endl;
+	std::cout << "BVH Done: " << std::endl;
 
+	std::cout << "\tBVH size: " << bvh->getSize() << std::endl;
+	std::cout << "\tBVH leaves: " << bvh->getLeaves() << std::endl << std::endl;
+
+	BVHStats stats = bvh->analyzeBVHLeaves(bvh);
+	std::cout << "\tMin triangles per leaf: " << stats.min_triangles << std::endl;
+	std::cout << "\tMax triangles per leaf: " << stats.max_triangles << std::endl;
+	std::cout << "\tAverage triangles per leaf: " << stats.average_triangles << std::endl << std::endl;
 
 	return (true);
 }

srcs/class/Window.cpp

@@ -248,7 +248,7 @@ void Window::imGuiRender()
 
 	ImGui::End();
 
-	ImGui::Begin("Debug");
+	ImGui::Begin("Debug BVH");
 
 	has_changed |= ImGui::Checkbox("Enable", (bool *)(&_scene->getDebug().enabled));
 	ImGui::Separator();