diff --git a/CreoManager.cpp b/CreoManager.cpp
index a9110d6..1d31e96 100644
--- a/CreoManager.cpp
+++ b/CreoManager.cpp
@@ -30,12 +30,12 @@
 #include <vector>
 
 // Shell Analysis Algorithm Constants
-const int SHELL_ANALYSIS_NUM_DIRECTIONS = 96;
-const double SHELL_ANALYSIS_MIN_VISIBILITY_RATIO = 0.05;
-const int SHELL_ANALYSIS_MIN_VOTES = 2;
-const double SHELL_ANALYSIS_HIGH_VISIBILITY_THRESHOLD = 0.25;
-const double SHELL_ANALYSIS_MEDIUM_VISIBILITY_THRESHOLD = 0.08;
-const double SHELL_ANALYSIS_OCCLUSION_TOLERANCE = 0.5;
+const int SHELL_ANALYSIS_NUM_DIRECTIONS = 96;                      // 多方向投影采样数量
+const double SHELL_ANALYSIS_MIN_VISIBILITY_RATIO = 0.04;           // 最小可见率：4%方向可见即为外壳候选
+const int SHELL_ANALYSIS_MIN_VOTES = 2;                            // 最少得票数：至少2个方向可见
+const double SHELL_ANALYSIS_HIGH_VISIBILITY_THRESHOLD = 0.20;      // 高可见度阈值：20%以上强制保留
+const double SHELL_ANALYSIS_MEDIUM_VISIBILITY_THRESHOLD = 0.06;    // 中等可见度阈值：6-20%需要审查
+const double SHELL_ANALYSIS_OCCLUSION_TOLERANCE = 0.5;             // 遮挡容差（当前未使用）
 #include <limits>
 #include <map>
 #include <unordered_map>
@@ -2831,8 +2831,8 @@ CreoManager::ProjectionAnalysisData CreoManager::PerformMultiDirectionalProjecti
         double occlusionBoundary = -std::numeric_limits<double>::max();
 
         for (const auto& proj : projections) {
-            // If component's nearest point is beyond occlusion boundary (with tolerance), it's visible
-            if (proj.minProj > occlusionBoundary - SHELL_ANALYSIS_OCCLUSION_TOLERANCE) {
+            // Strict occlusion: component visible only if completely unoccluded
+            if (proj.minProj > occlusionBoundary) {
                 result.visibilityVotes[proj.featureId]++;
                 // Update occlusion boundary to this component's farthest point
                 occlusionBoundary = std::max(occlusionBoundary, proj.maxProj);