fix wrong normal direction

primitive_process/src/primitive/axis/helixline_extrude_axis.cpp

@@ -89,7 +89,7 @@ std::pair<Eigen::Vector2d, Eigen::Projective2d> helixline_extrude_axis::to_patte
 
     // 为了与polyline的表现一致，这里交换割线与法线
     Eigen::Vector3d bitangent{std::cos(this->total_theta * t), std::sin(this->total_theta * t), .0};
-    Eigen::Vector3d normal{std::sin(this->total_theta * t), std::cos(this->total_theta * t), this->total_theta};
+    Eigen::Vector3d normal{std::sin(this->total_theta * t), -std::cos(this->total_theta * t), this->total_theta};
     normal /= std::sqrt(1 + this->total_theta * this->total_theta);
 
     const auto proj_x = op.dot(bitangent);