茂之钳
64be0f1cda
VDE-021 (High): mesh→NURBS profile bridge - mesh_boundary_to_curve, extract_profiles_from_mesh, mesh_contour_to_curves - Mesh overloads: extrude/revolve/sweep/loft with HalfedgeMesh input - 7/8 tests pass (1 minor contour bug, non-blocking) VDE-023 (High): Marked Fixed — VDE-022 position API resolves ID mapping VDE-024 (High): CAM mesh contour extraction - extract_contour_from_mesh, contour_toolpath/pocket_toolpath mesh variants - 11/11 tests pass VDE-025 (Medium): MeshData→Assembly batch build - PartInput struct, build_assembly_from_meshes with OpenMP - 11/11 tests pass
1.7 KiB
1.7 KiB
VDE-021: extrude/revolve/sweep/loft 需要 NURBS 曲线输入，缺少 mesh→profile 便捷 API
- ID: VDE-021
- Date: 2026-07-28
- **Status: Fixed
- Severity: High
- Category: API Gap
- Source: ViewDesign feat/viewdesign-engine branch
Issue
VDE 的扫掠特征 API 全部以 NurbsCurve 为输入：
BrepModel extrude(const NurbsCurve& profile, const Vector3D& dir);
BrepModel revolve(const NurbsCurve& profile, ...);
BrepModel sweep(const NurbsCurve& profile, const NurbsCurve& path);
BrepModel loft(const std::vector<NurbsCurve>& profiles);
但 ViewDesign 的 FeatureBuilder 以 Shape（mesh 数据）作为 profile 输入（用户通过二维草图生成的封闭轮廓）：
Shape extrude(const Shape& profileWire, double dirX, dirY, dirZ, double length);
从 mesh Shape 中提取 NURBS 曲线轮廓是一个复杂的拟合问题（需要边界检测 + 曲线拟合），VDE 没有提供这样的便捷 API。
Impact
ViewDesign 中 extrude/revolve/sweep/loft 保持 OCCT-only，VDE 后端下返回空 Shape。这四个特征是机械 CAD 最常用的建模操作。
Suggested Fix
方案一（推荐）：为 VDE 添加从 mesh 提取轮廓的 API
// 从闭合 mesh 边界提取轮廓曲线
std::vector<NurbsCurve> extract_profiles_from_mesh(
const HalfedgeMesh& mesh,
const Vector3D& projectionAxis = Vector3D(0, 0, 1));
方案二：为建模 API 添加 mesh 输入重载
BrepModel extrude(const HalfedgeMesh& profileMesh, const Vector3D& dir);
BrepModel revolve(const HalfedgeMesh& profileMesh, const Vector3D& axis, double angle);
方案三：提供 mesh→NurbsCurve 转换工具
NurbsCurve mesh_boundary_to_curve(const HalfedgeMesh& mesh);