CGAL users discussion list

["jim.wilenius" <>]

Hi!
 
 I am using the CGAL lib in OSX 10.6. (freshly compiled, I followed the
instructions carefully)

I am using the CGAL::Exact_predicates_inexact_constructions_kernel and when
running minkowski sum I get:
---
terminate called after throwing an instance of
'CGAL::Precondition_exception'
  what():  CGAL ERROR: precondition violation!
Expr: cv.is_in_x_range (p)
File: /usr/local/include/CGAL/Arr_segment_traits_2.h
Line: 486
---

I get the error given the following two polygons (in order):

P:
4
0.0 0.0
29.809108311772626 0.0
29.809108311772626 29.809108311772626
0.0 29.809108311772626

Q:
7
99.10004234616522 202.2922116762398
168.16528534816382 202.2922116762398
168.16528534816382 271.3574546782384
154.3522367477641 271.3574546782384
140.53918814736437 243.73135747743896
126.72613954696467 229.91830887703924
99.10004234616522 216.1052602766395

I am not sure exactly what the error means? Is it supposed to give an error?
If I use CGAL::Exact_predicates_exact_constructions_kernel then I do not get
the error.

using exact constructions is extremely slow for my application, so I would
really like to use inexact.

by the way, how inexact is the inexact kernel? Any pointers to useful info
is welcome.

Regards,
Jim



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