SFCGAL is a C++ wrapper library around CGAL with the aim of supporting ISO 19107:2013 and OGC Simple Features Access 1.2 for 3D operations.
SFCGAL 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
