CGAL users discussion list

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Heihei


在2009-02-13，"杨成林" <> 写道：
> Hello
>
> I am new to CGAL.I use  linear_least_squares_fitting_3 to estimate
> normals from point-cloud.But it can't give correct results
> sometimes.After examining the source code,I think line 709-710 in
> PCA_util.h(CGAL 3.4) may be incorrect.
>
> eigen_values[2] is the smallest eigenvalue,so "eigen_values[2] ==
> eigen_values[1]" means Degeneracy."eigen_values[0] == eigen_values[1]"
> just means the points distribute isotropically in the plane,but the
> fitting plane exists uniquely.
>
> I change this two lines to "if(eigen_values[2] != eigen_values[1])".It
> works well.
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