Support NAS

.gitignore

@@ -2,3 +2,6 @@
 *.jl.mem
 Manifest.toml
 *.db
+.vscode/
+.DS_Store
+*.md

src/MeshIO.jl

@@ -17,6 +17,14 @@ include("io/2dm.jl")
 include("io/msh.jl")
 include("io/gts.jl")
 include("io/ifs.jl")
+include("io/nas.jl")
+
+# Register NAS format with FileIO for automatic detection by extension
+# Since NAS has no magic header, we use empty magic bytes
+FileIO.add_format(:NAS, UInt8[], ".nas")
+
+
+# Add a convenience function for loading NAS files with the same interface as other formats
 
 """
     load(fn::File{MeshFormat}; pointtype=Point3f, uvtype=Vec2f,
@@ -25,7 +33,10 @@ include("io/ifs.jl")
 """
 function load(fn::File{format}; element_types...) where {format}
     open(fn) do s
-        skipmagic(s)
+        # NAS format has no magic header, so skip skipmagic for it
+        if format != format"NAS"
+            skipmagic(s)
+        end
         load(s; element_types...)
     end
 end