This library support ISO 19107:2013, OGC Simple Features Access 1.2 for 3D operations.
It provides standard compliant geometry types and operations, that can
be accessed from its C or C++ APIs. PostGIS uses the C API, to expose some
SFCGAL's functions in spatial databases (cf. PostGIS manual).

Geometry coordinates have an exact rational number representation and can
be either 2D or 3D. Among supported geometry types are :

Points
LineStrings
Polygons
TriangulatedSurfaces
PolyhedralSurfaces
GeometryCollections
Solids

Supported operations include :

WKT reading and writing with exact rational number representation for coordinates
Intersection operations and predicates
Convex hull computation
Tessellation
Extrusion
Area and distance computation
Minkovski sums
Contour offsets
Straight skeleton generations

Development at https://github.com/Oslandia/SFCGAL/