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> Hi I'm attempting to add a 3D vector class to Lua and I wondered if anyone
> had any thoughts on the matter. What would be the most efficient manner?
> (ie. fastest). Can I use tags to overload the arithmetic operators. eg.
> vec3= vec1 + vec2 ?
> Be something like: struct _vector3 { float x,y,z; };

I would sugest you to write in C and then 
bind the class and its methods to Lua.

"toLua" may help you on it

-- waldemar