茂之钳
080776930f
- 08_3d_print: Complete SDF→marching cubes→STL pipeline with mesh stats (volume, bounding box) and both binary + ASCII STL exports - 09_brep_fab: Fabrication-oriented B-Rep modeling: box→shell→STEP+GLB with AP214 header preview - python_examples/sdf_optimize_demo.py: SDF parameter optimization from point clouds with analytic gradient descent - Update examples/CMakeLists.txt to include new subdirectories - Add __pycache__/ to .gitignore
118 lines
5.7 KiB
C++
118 lines
5.7 KiB
C++
/// \file 09_brep_fab/main.cpp
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/// \brief Fabrication-oriented B-Rep modeling: box → shell → STEP + GLB export
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///
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/// Demonstrates a typical design-for-manufacturing workflow using boundary
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/// representation (B-Rep). The part is exported both to STEP (AP214, for
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/// CAM/CNC) and to GLB (for quick 3D preview in any viewer).
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#include <vde/brep/modeling.h>
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#include <vde/brep/step_export.h>
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#include <vde/foundation/io_gltf.h>
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#include <vde/core/aabb.h>
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#include <iostream>
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#include <iomanip>
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using namespace vde::brep;
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using namespace vde::foundation;
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using namespace vde::core;
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// ═══════════════════════════════════════════════════════════════════════
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// Main — B-Rep Fabrication
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// ═══════════════════════════════════════════════════════════════════════
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int main() {
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std::cout << std::fixed << std::setprecision(3);
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std::cout << "╔══════════════════════════════════╗\n"
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<< "║ B-Rep Fabrication ║\n"
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<< "╚══════════════════════════════════╝\n\n";
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// ── Step 1: Base solid box ───────────────────────────────────────
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//
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// External dimensions: 100 × 50 × 30 mm (typical enclosure part)
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double w = 100.0, h = 50.0, d = 30.0;
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auto part = make_box(w, h, d);
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AABB3D bb_raw = part.bounds();
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std::cout << "Step 1: make_box(" << w << ", " << h << ", " << d << ")\n"
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<< " volume: " << w * h * d << " mm³ (raw)\n"
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<< " bbox: (" << bb_raw.min().x() << ", " << bb_raw.min().y()
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<< ", " << bb_raw.min().z() << ") → ("
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<< bb_raw.max().x() << ", " << bb_raw.max().y()
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<< ", " << bb_raw.max().z() << ")\n";
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// ── Step 2: Shell to a thin-walled enclosure ─────────────────────
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//
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// face_id = -1 → closed shell (no openings, hollow interior)
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// thickness = 2.0 mm → typical for injection-moulded / 3D-printed parts
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const double wall_thickness = 2.0;
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part = shell(part, -1, wall_thickness);
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AABB3D bb_shell = part.bounds();
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std::cout << "\nStep 2: shell(face_id=-1, thickness=" << wall_thickness << ")\n"
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<< " faces: " << part.num_faces() << "\n"
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<< " edges: " << part.num_edges() << "\n"
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<< " bbox: (" << bb_shell.min().x() << ", " << bb_shell.min().y()
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<< ", " << bb_shell.min().z() << ") → ("
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<< bb_shell.max().x() << ", " << bb_shell.max().y()
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<< ", " << bb_shell.max().z() << ")\n";
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// ── Step 3: Export to STEP for CAM ────────────────────────────────
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//
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// AP214 format is the standard exchange format for CNC machining,
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// 5-axis milling, sheet-metal bending, and coordinate measurement.
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std::cout << "\nStep 3: Export STEP (AP214)\n";
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const char* step_path = "output_fab.stp";
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export_step_file(step_path, {part});
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// Show the raw STEP header for verification
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std::string step_str = export_step({part});
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// Find the end of the header section
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auto header_end = step_str.find("FILE_SCHEMA");
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if (header_end != std::string::npos) {
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header_end = step_str.find("ENDSEC;", header_end);
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}
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size_t preview_len = std::min(header_end + 6, step_str.size());
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if (preview_len > 0 && preview_len < step_str.size()) {
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std::cout << " → " << step_path << " ("
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<< step_str.size() << " chars)\n";
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std::cout << " Header excerpt:\n"
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<< step_str.substr(0, preview_len) << "\n ...\n";
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} else {
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std::cout << " → " << step_path << " ("
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<< step_str.size() << " chars)\n";
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}
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// ── Step 4: Export to GLB for 3D preview ─────────────────────────
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std::cout << "\nStep 4: Export GLB for visualization\n";
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const char* glb_path = "output_fab.glb";
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const int tess_res = 32; // segments per curved edge
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if (write_brep_gltf(glb_path, part, tess_res)) {
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std::cout << " → " << glb_path << " (tessellation level "
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<< tess_res << ")\n";
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std::cout << " Open in: gltf-viewer.donmccurdy.com, blender, three.js editor\n";
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} else {
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std::cerr << " ✗ Failed to write " << glb_path << "\n";
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return 1;
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}
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// ── Summary ──────────────────────────────────────────────────────
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std::cout << "\n╔══════════════════════════════════════════╗\n"
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<< "║ Export Summary ║\n"
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<< "╠══════════════════════════════════════════╣\n"
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<< "║ B-Rep → STEP (CAM/CNC) ✓ ║\n"
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<< "║ B-Rep → GLB (Preview) ✓ ║\n"
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<< "╚══════════════════════════════════════════╝\n";
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std::cout << "\nDone.\n";
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return 0;
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}
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