CGAL users discussion list

[Simon Giraudot <>]

Hello,

Le 30/01/2019 à 10:32, zhaojing a écrit :
> I really don't get it. Aren't the kernels expected to replace one another?
Not necessarily: in particular, the EPEC kernel is not always available 
as some operations can't be done exactly. We have some flexibility with 
that (for example authorizing functions like square root which can't be 
done exactly) but it means momentarily breaking the exactness and it is 
not always done.

The bug that you have seems simpler than that (just a conversion issue), 
but as RANSAC is intrinsically an inexact algorithm (it performs 
randomized approximations for which there is no gain in using exact 
constructions), it probably seemed unlikely (when it was written) that 
someone would use EPEC on it and it was not tested with it.

The fact that RANSAC can't use EPEC should be however documented and 
it's not. This should at least be fixed.

Best,

--
Simon Giraudot, PhD
R&D Engineer
GeometryFactory - http://geometryfactory.com/