Unity datatypes, serializeable with Protobuf

ProtoVector3d.cs

[ProtoContract]
public struct ProtoVector3d
{
    // Vector3 definitions
    [ProtoMember(1)] public Double x;
    [ProtoMember(2)] public Double y;
    [ProtoMember(3)] public Double z;

    // Convert Vector3d to ProtoVector3d
    public static implicit operator ProtoVector3(Vector3d input)
    {
        return new ProtoVector3d
        {
            x = input.x,
            y = input.y,
            z = input.z
        };
    }

    // Convert ProtoVector3d to Vector3d
    public static implicit operator Vector3d(ProtoVector3 input)
    {
        return new Vector3d
        {
            x = input.x,
            y = input.y,
            z = input.z
        };
    }
}