public static void Add(this ColladaValueArray <float> array, LowLevel.Math.real_vector3d v)
{
array.Add(v.I, v.J, v.K);
}
public static void Add(this ColladaValueArray <float> array, LowLevel.Math.real_point3d v)
{
array.Add(v.X, v.Y, v.Z);
}