Re: [ggt-devel] Best way to grab an entire column (Matrix44f)

[Ben S. <bs...@ga...>]

You need to dereference your matrix pointer before accessing it like an
array. Try the following code:

const Matrix44f& mat = *entity->GetTransform();
Vec3f out_vec(mat[2][0], mat[2][1], mat[2][2]);

cheers,
-Ben

> How this is the right list: What is the recommended method for grabbing an
> entire column?
>
> Can't seem to find a general GetColumn() routine in the Matrix definition.
> I can't seem to even grab the components and throw them in a vector when
> the Matrix44f is a pointer.
>
> Matrix44f* mat = entity->GetTransform(); // GetTransform() returns
> Matrix44f*
> Vec3f out_vec(mat[2][0],mat[2][1],mat[2][2]);
>
> yields:
>
> error C2664: 'gmtl::Vec<DATA_TYPE,SIZE>::Vec(const DATA_TYPE &,const
> DATA_TYPE &,const DATA_TYPE &)' : cannot convert parameter 1 from
> 'gmtl::Matrix<DATA_TYPE,ROWS,COLS>::RowAccessor *' to 'const float &'
>
> Any help would be greatly appreciated.
>
> cheers
>
> E.
>
>
>
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