feat: obj writing

application/main.cpp

@@ -1,8 +1,38 @@
 #include <iostream>
 #include <array>
 
+
 #include <solve.h>
 
+#include <fstream>
+#include <string>
+#include <filesystem> 
+
+void write_obj(const polymesh_t& mesh, std::string filename = "output.obj") {
+    std::ofstream obj(filename);
+    if (!obj) return;
+
+    // write in vertices
+    for (uint32_t i = 0; i < mesh.num_vertices; ++i) {
+        const auto& v = mesh.vertices[i];
+        obj << "v " << v.x << " " << v.y << " " << v.z << "\n";
+    }
+
+    // write in faces
+    uint32_t idx = 0;
+    for (uint32_t i = 0; i < mesh.num_faces; ++i) {
+        obj << "f";
+        for (uint32_t j = 0; j < mesh.vertex_counts[i]; ++j) {
+            // OBJ is 1-indexed
+            obj << " " << (mesh.faces[idx++] + 1);
+        }
+        obj << "\n";
+    }
+    std::cout << "OBJ file written to: " << std::filesystem::absolute(filename) << std::endl;
+}
+
+
+
 int main()
 {
     auto primitive_data_center = create_primitive_data_center();
@@ -29,6 +59,7 @@ int main()
     auto solver                                 = create_solver(baked_blobtree, settings);
 
     auto result = generate_polymesh(solver);
+    write_obj(result.mesh, "output.obj");
     print_statistics(solver);
 
     destroy_solver(solver);