conversion between float[3] and vector3d

[JonLT]

This is no big thing but alot of times i need to convert between float[3] and vector3d, mostly when using newton. So i look in some of the files in the newton samples and found some stuff that i added to the vector3d class:

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//an additional constructor
vector3d(const T* ptr) : X(ptr[0]), Y(ptr[1]), Z(ptr[2]) {};
//additional operators
T& operator[] (int i) { return (&X)[i]; }
const T& operator[] (int i) const { return (&X)[i]; }

With this included in the vector3d class conversion is very easy:
float[3] to vector3d:

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float[3] f = {1,2,3};
vector3df v(f); //this makes a vector from the float

vector3d to float[3]:

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vector3df v(1,2,3);
float *f = &v[0]; //this makes a float[3] from the vector3d

I know this isn't magic, but i find it usefull so i thought i'd share it!