Add conditional mesh import/export to python bindings

bindings/python/manifold3d.cpp

@@ -19,6 +19,9 @@
 #include "manifold/cross_section.h"
 #include "manifold/manifold.h"
 #include "manifold/polygon.h"
+#ifdef MANIFOLD_EXPORT
+#include "manifold/meshIO.h"
+#endif
 #include "nanobind/nanobind.h"
 #include "nanobind/ndarray.h"
 #include "nanobind/operators.h"
@@ -27,6 +30,7 @@
 #include "nanobind/stl/pair.h"
 #include "nanobind/stl/tuple.h"
 #include "nanobind/stl/vector.h"
+#include "nanobind/stl/string.h"
 
 namespace nb = nanobind;
 using namespace manifold;
@@ -570,7 +574,20 @@ NB_MODULE(manifold3d, m) {
       .def_ro("run_index", &MeshGL::runIndex)
       .def_ro("run_original_id", &MeshGL::runOriginalID)
       .def_ro("face_id", &MeshGL::faceID)
-      .def("merge", &MeshGL::Merge, mesh_gl__merge);
+      .def("merge", &MeshGL::Merge, mesh_gl__merge)
+#ifdef MANIFOLD_EXPORT
+      .def(
+          "export_mesh",
+          [](const MeshGL &self, const std::string &filename) {
+            ExportMesh(filename, self, {});
+          },
+          nb::arg("filename"))
+      .def_static("import_mesh",
+                  [](const std::string &filename) -> MeshGL {
+                    return ImportMesh(filename);
+                  }, nb::arg("filename"))
+#endif
+      ;
 
   nb::enum_<Manifold::Error>(m, "Error")
       .value("NoError", Manifold::Error::NoError)