Re: [Toon-members] TooN helpers.h

[Gerhard Reitmayr]

be aware that this function won't work for slices etc. because they  
are non-const temporaries. i.e.

Vector<4> v;
normalize(v.slice<0,3>()); // this will fail

that's why we went with the unit function, for static vectors the  
compiler generates the same code
v.slice<0,3>() = unit(v.slice<0,3>());

for Identity, the only working solution at the moment is:

Matrix<10> m = Identity;
m *= 22.0;

We could do something like the following:

Matrix<10> m = 22.0 * Identity;

one alternative would be:

Matrix<10> m = Identity(22.0);

but this is already overloaded with identity for dynamic matrices  
where one has to pass in the size at construction time:

Matrix<> d = Identity(10);

what do you guys think ?


On 16 Apr 2009, at 16:23, Georg Klein wrote:

> CVSROOT:        /sources/toon
> Module name:    TooN
> Changes by:     Georg Klein <georgklein>  09/04/16 15:23:24
>
> Modified files:
>         .              : helpers.h
>
> Log message:
>         Added normalize helper
>
> CVSWeb URLs:
> http://cvs.savannah.gnu.org/viewcvs/TooN/helpers.h?cvsroot=toon&r1=1.47&r2=1.48
>
> Patches:
> Index: helpers.h
> ===================================================================
> RCS file: /sources/toon/TooN/helpers.h,v
> retrieving revision 1.47
> retrieving revision 1.48
> diff -u -b -r1.47 -r1.48
> --- helpers.h   14 Apr 2009 16:08:47 -0000      1.47
> +++ helpers.h   16 Apr 2009 15:23:23 -0000      1.48
> @@ -68,6 +68,11 @@
>                 return v * (1/sqrt(v*v));
>         }
>
> +	template<int Size, class Precision, class Base> inline void  
> normalize(Vector<Size, Precision, Base> & v)
> +       {
> +               v /= std::sqrt(v*v);
> +       }
> +
> 	template<int Size, typename Precision, typename Base> inline  
> Vector<Size-1, Precision> project( const Vector<Size, Precision,  
> Base> & v){
>                 return v.template slice<0,Size-1>() / v[Size-1];
>         }
>
>
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--
Gerhard Reitmayr
MIL, Engineering Department, Cambridge University
http://mi.eng.cam.ac.uk/~gr281/