diff --git a/application/main.cpp b/application/main.cpp
index f2a691f..539ad24 100644
--- a/application/main.cpp
+++ b/application/main.cpp
@@ -165,10 +165,68 @@ void testPolylineSDF()
     }
 }
 
+void testHex()
+{
+    std::vector<raw_vector3d_t> points;
+    std::vector<double>         bulges;
+    points.push_back({-10800.000000000031, -7479.9999999988240, 0.0000000000000000});
+    points.push_back({-7200.0000000000291, -7479.9999999988240, 0.0000000000000000});
+    points.push_back({-7200.0000000000291, -7719.9999999988240, 0.0000000000000000});
+    points.push_back({-10800.000000000031, -7719.9999999988240, 0.0000000000000000});
+    bulges.push_back(0.0000000000000000);
+    bulges.push_back(0.0000000000000000);
+    bulges.push_back(0.0000000000000000);
+    bulges.push_back(0.0000000000000000);
+    polyline_descriptor_t profile{
+        4,
+        points.data(),
+        4,
+        bulges.data(),
+        raw_vector3d_t{0., 0., 1.},
+        true
+    };
+    auto axisEnd                     = points[0];
+    axisEnd.z                        = 78.000000000471118;
+    auto                  axisPoints = std::array{points[0], axisEnd};
+    auto                  axisBulges = std::array{0.0};
+    polyline_descriptor_t axis{
+        2,
+        axisPoints.data(),
+        1,
+        axisBulges.data(),
+        raw_vector3d_t{0., 1., 0.},
+        false
+    };
+    extrude_polyline_descriptor_t extrude{1, &profile, axis};
+    aabb_t<>                      aabb{};
+    internal::extrude_polyline    extrude_polyline{extrude, aabb};
+
+    std::vector<Eigen::Vector3d> queryPoints = {
+        {0.,    0.,    0. },
+        {-8000, 0,     10 },
+        {-8000, 0,     -10},
+        {-8000, -7500, 10 },
+        {-8000, -7481, 10 },
+        {-7202, -7500, 10 }
+    };
+    for (const auto &queryPoint : queryPoints) {
+        double          res           = extrude_polyline.evaluate_sdf(queryPoint);
+        Eigen::Vector3d closest_point = extrude_polyline.evaluate_cpm(queryPoint);
+        printf("SDF at (%f, %f, %f) is %f, closest point: (%f, %f, %f)\n",
+               queryPoint.x(),
+               queryPoint.y(),
+               queryPoint.z(),
+               res,
+               closest_point.x(),
+               closest_point.y(),
+               closest_point.z());
+    }
+}
+
 int main()
 {
     // testExtrudeSDFZoX();
-    testExtrudeSDFXoY();
+    testHex();
     // testPolylineSDF();
 
     // std::cout << "Setting scene..." << std::endl;
diff --git a/primitive_process/src/extrude_polyline.cpp b/primitive_process/src/extrude_polyline.cpp
index 1b15d52..a01001a 100644
--- a/primitive_process/src/extrude_polyline.cpp
+++ b/primitive_process/src/extrude_polyline.cpp
@@ -1,5 +1,6 @@
 #include "Eigen/Core"
 #include "internal_primitive_desc.hpp"
+#include <cassert>
 #include <cmath>
 #include <iostream>
 
@@ -19,9 +20,36 @@ extrude_polyline::extrude_polyline(const extrude_polyline_descriptor_t &desc, aa
                                    matrix_handle.col(2),
                                    matrix_handle.col(3),
                                    profile_aabb);
-    const auto profile_max_extent  = profile_aabb.max().cwiseMax(profile_aabb.min().cwiseAbs()).maxCoeff();
-    aabb.min().array()            -= profile_max_extent;
-    aabb.max().array()            += profile_max_extent;
+    const auto profile_max_extent       = profile_aabb.max().cwiseMax(profile_aabb.min().cwiseAbs()).maxCoeff();
+    //////////////special judge////////////////
+    const auto eqs                      = [](double a, double b) { return std::abs(a - b) < EPSILON; };
+    int        aabb_parallel_coord_axis = -1;
+    if (eqs(aabb.min().x(), aabb.max().x()) && eqs(aabb.min().y(), aabb.max().y())) {
+        aabb_parallel_coord_axis = 2;
+        assert(aabb.min().z() != aabb.max().z());
+        aabb.min().x() -= profile_max_extent;
+        aabb.max().x() += profile_max_extent;
+        aabb.min().y() -= profile_max_extent;
+        aabb.max().y() += profile_max_extent;
+    } else if (eqs(aabb.min().x(), aabb.max().x()) && eqs(aabb.min().z(), aabb.max().z())) {
+        aabb_parallel_coord_axis = 1;
+        assert(aabb.min().y() != aabb.max().y());
+        aabb.min().x() -= profile_max_extent;
+        aabb.max().x() += profile_max_extent;
+        aabb.min().z() -= profile_max_extent;
+        aabb.max().z() += profile_max_extent;
+    } else if (eqs(aabb.min().y(), aabb.max().y()) && eqs(aabb.min().z(), aabb.max().z())) {
+        aabb_parallel_coord_axis  = 0;
+        aabb.min().y()           -= profile_max_extent;
+        aabb.max().y()           += profile_max_extent;
+        aabb.min().z()           -= profile_max_extent;
+        aabb.max().z()           += profile_max_extent;
+    }
+    //////////////EO special judge////////////////
+    else {
+        aabb.min().array() -= profile_max_extent;
+        aabb.max().array() += profile_max_extent;
+    }
 }
 
 extrude_polyline::extrude_polyline(extrude_polyline_descriptor_t &&desc, aabb_t<> &aabb)