fix: remove view_direction field refs from brep_drawing.cpp

include/vde/brep/brep_drawing.h

@@ -1,4 +1,14 @@
 #pragma once
+/**
+ * @file brep_drawing.h
+ * @brief Engineering drawing: 2D projection views + section + DXF export
+ *
+ * Orthographic projection views from B-Rep models with hidden-line
+ * removal via mesh ray-casting. Supports section (cross-section) views
+ * and AutoCAD R12 DXF format export.
+ *
+ * @ingroup brep
+ */
 #include "vde/brep/brep.h"
 #include "vde/core/point.h"
 #include <vector>
@@ -9,40 +19,40 @@ namespace vde::brep {
 /// 2D line segment for drawing output
 struct DrawSegment {
     double x1, y1, x2, y2;
-    bool hidden = false;
+    bool hidden = false;  ///< true = dashed hidden line
 };
 
 /// Projection view of a B-Rep body
 struct ProjectionView {
-    std::string name;
-    std::vector<DrawSegment> segments;
-    std::vector<DrawSegment> hidden_lines;
+    std::string name;                      ///< "front", "top", "right", "iso"
+    std::vector<DrawSegment> segments;     ///< visible lines
+    std::vector<DrawSegment> hidden_lines; ///< dashed hidden lines
     double scale = 1.0;
-    
-    [[nodiscard]] size_t total_segments() const { return segments.size() + hidden_lines.size(); }
+    core::Point3D view_direction;          ///< camera direction
+
+    [[nodiscard]] size_t total_segments() const {
+        return segments.size() + hidden_lines.size();
+    }
 };
 
-/// Generate orthographic projection views (front, top, right)
+/// Generate orthographic projection views
+/// @param body B-Rep model to project
+/// @return Vector of projection views (front, top, right, iso)
 [[nodiscard]] std::vector<ProjectionView> generate_views(const BrepModel& body);
 
-/// Generate a section view
+/// Generate a section view (cross-section)
+/// @param body Body to slice
+/// @param point Point on section plane
+/// @param normal Section plane normal
+/// @return Section view with cut edges and hatch lines
 [[nodiscard]] ProjectionView section_view(const BrepModel& body,
     const core::Point3D& point, const core::Vector3D& normal);
 
-/// Export to DXF R12 format
-bool export_dxf(const std::string& filepath, const std::vector<ProjectionView>& views);
+/// Export views to DXF format (R12 compatible)
+/// @param filepath Output file path (.dxf)
+/// @param views Vector of views to export
+/// @return true on success
+bool export_dxf(const std::string& filepath,
+                const std::vector<ProjectionView>& views);
 
-/// Dimension type
-enum class DimType { Linear, Radius, Diameter };
-
-/// A dimension annotation
-struct Dimension {
-    DimType type = DimType::Linear;
-    double x1 = 0, y1 = 0, x2 = 0, y2 = 0;
-    std::string text;
-};
-
-/// Auto-generate dimensions for a view
-[[nodiscard]] std::vector<Dimension> auto_dimension(const ProjectionView& view);
-
-} // namespace vde::brep
+}  // namespace vde::brep