CGAL 4.5 beta1
12 August 2014
Installation
 Changes in the set of supported platforms:
 The Microsoft Windows Visual C++ compiler 2008 (VC9) is no
longer supported since CGAL4.5.
 Since CGAL versionĀ 4.0, Eigen was the recommended thirdparty
library to use with Planar Parameterization of Triangulated
Surface Meshes, Surface Reconstruction from Point
Sets, Approximation of Ridges and Umbilics on Triangulated
Surface Meshes, and Estimation of Local Differential
Properties of PointSampled Surfaces packages. From CGAL
versionĀ 4.5, Taucs, Blas and Lapack are no longer supported.
 CGAL is now compatible with the new CMake versionĀ 3.0.
Triangulated Surface Mesh Deformation (new package)
 This package allows to deform a triangulated surface mesh
under positional constraints of some of its vertices without
requiring any additional structure other than the surface mesh itself.
The methods provided implements an asrigidaspossible deformation.
CGAL and the Boost Graph Library (major changes)
 Cleanup of the
HalfedgeGraph
concept. In particular:
 Introduction of the notion of
halfedge_descriptor
in
the specialization of the
class boost::graph_traits
.
 Deprecation of
halfedge_graph_traits
.
 A model of
HalfedgeGraph
is considered as an
undirected graph. Thus any call to edges()
should be
replaced by halfedges()
and num_edges()
now returns the number of (undirected) edges.
 Breaking change:
is_border_edge
and is_border_halfedge
properties are removed. The
free functions is_border()
and is_border_edge()
should be used instead.
 Renaming of
HalfedgeGraph
specific free
functions.
 Introduction of the
FaceGraph
concept.
 Adaptation of the package Triangulated Surface Mesh
Simplification and of the
class
AABB_halfedge_graph_segment_primitive
from the
package 3D Fast Intersection and Distance Computation to
the API change.
 Update of the package Triangulated Surface Mesh
Segmentation and of the class
AABB_face_graph_triangle_primitive
from the
package 3D Fast Intersection and Distance Computation to
accept model of the newly introduced concepts.
 Offer Euler operations as free functions for models of the
graph concepts provided by CGAL.
 Specialization of
boost::graph_traits
for OpenMesh::PolyMesh_ArrayKernelT
as proof of
concept. A OpenMesh::PolyMesh_ArrayKernelT
becomes a
model of the aforementioned concepts when including
CGAL/boost/graph/graph_traits_PolyMesh_ArrayKernelT.h
.
dD Geometry Kernel
 A new model
Epick_d
of the Kernel_d
concept is introduced. It provides better performance through
arithmetic filtering and specializations for fixed dimensions. It may
not work with compilers as old as gcc4.2, but was tested with
gcc4.4.
3D Convex Hulls
 Clean up the documentation of the concepts
2D Arrangements
 Fixed a bug in removing an unbounded curve (e.g., a ray) from
an arrangement induced by unbounded curves.
2D Snap Rounding
 Replaced use of private
kd_tree
with CGAL's
official Kd_tree
from Spatial_searching
package; results in a small performance gain. Removed the
private kd_tree
package.
3D Triangulations
 Add an experimental parallel version of the Delaunay triangulation
and the regular triangulation algorithms, which allows parallel
insertion and removal of point ranges.
3D Mesh Generation
 Add a new constructor for the
class
Labeled_mesh_domain_3
which takes
an Iso_cuboid_3
.
 Add a new labeling function wrapper for meshing multidomain.
 The meshing functionality in the Qt demos
in
demo/Polyhedron/
and demo/Mesh_3/
can
now use the handling of 1dfeatures, that exists in CGAL since
version 3.8.
 Add an experimental parallel version of the 3D mesh refinement and
mesh optimization methods.
 Add caching of circumcenters to
Regular_triangulation_cell_base_3
. The cache value is
computed when cell>circumcenter()
or rt.dual(cell)
functions are called.
Point Set Processing and Surface Reconstruction from Point Sets
 The former demo has been removed and is fully merge in the
Polyhedron demo.
Point Set Processing
 Workaround a bug in dijsktra shortest path of boost 1.54 by
shipping and using the boost header from the 1.55 release. This
header will be used only if you are using the version 1.54 of
boost.
Triangulated Surface Mesh Simplification

Breaking change: Due to the cleanup of the concepts of the
package CGAL and the Boost Graph Library, the named
parameter
edge_is_border_map
has been removed, and the
named parameter
edge_is_constrained_map
now expects a property map with
an edge descriptor as key type (vs. halfedge descriptor before).
 Add some optimization in the code making the implementation faster
(depending on the cost and the placement chosen). However, for an
edge which collapse is not topologically valid, the vector of
vertices of the link provided by its profile might contains
duplicates, thus also breaking the orientation guarantee in the
vector. This must not be a problem for users as the edge is not
collapsible anyway but if it is a absolute requirement for user
defined cost/placement, defining the
macro
CGAL_SMS_EDGE_PROFILE_ALWAYS_NEED_UNIQUE_VERTEX_IN_LINK
will restore the former behavior.
dD Spatial Searching
 Added methods
reserve(size_t size)
and size_t
capacity()
to class Kd_tree
to allocate memory
to store size
points and to report that number (STL
compliance).
STL Extensions for CGAL
 Add
Compact_container::operator[]
, allowing a direct
access to the ith element of a compact container.
 Add
Concurrent_compact_container
, a compact container
which allows concurrent insertion and removal.