unary operator "-" for vector3d

[calimero]

the template class vector3d lacks for the unary operator -

so you can't write code like this :

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vector3df v1 = vector3df(0.0f,0.1f,0.0f);
vector3df v2 = -v1;

to have this operator just add

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vector3d<T> operator-() const { return vector3d<T>(-X, -Y, -Z);	}

in the public area of vector3d.h.
I test it for float and it works OK. And I think it's more interesting than the legacy "invert" method because it doesn't use 3 <T>multiplications but just 3 <T> change of sign.

[niko]

Thanks, should be useful.