Capítulo 8. SFCGAL Functions Reference
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Capítulo 8. SFCGAL Functions Reference

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SFCGAL é uma biblioteca wrapper C++ em torno do CGAL que fornece funções 2D e 3D avançadas. Para robustez, coordenadas de geometria têm a representação exata de número racional.

As instruções de instalação da biblioteca, podem ser encontradas na página inicial do SFCGAL http://www.sfcgal.org. Para carregar as funções, crie uma extensão postgis_sfcgal.

8.1. SFCGAL Management Functions

Resumo

This section lists functions for determining version of SFCGAL and library dependencies you are running.

postgis_sfcgal_version — retorna a versão do SFCGAL em uso
postgis_sfcgal_full_version — Returns the full version of SFCGAL in use including CGAL and Boost versions

8.2. SFCGAL Accessors and Setters

Resumo

These functions access or set properties of geometries. Geometries primarily supported by these functions are TINS and Polyhedral Surfaces.

CG_ForceLHR — Orientação força LHR
CG_IsPlanar — Verifique se a superfície é ou não planar
CG_IsSolid — teste se a geometria é um sólido. Nenhuma verificação de validade é representada.
CG_MakeSolid — Molde a geometria para um sólido. Nenhuma verificação é apresentada. Para obter um sólido válido, a geometria de entrada deve ser uma superfície poliédrica fechada ou um TIN fechado.
CG_Orientation — Determine orientação da superfície
CG_Area — Calculates the area of a geometry
CG_3DArea — Computa a área de geometrias de superfície 3D. Irá retornar 0 para sólidos.
CG_Volume — Computes the volume of a 3D geometry. Closed surfaces can have non-zero volume.

8.3. SFCGAL Processing and Relationship Functions

CG_Intersection — Computes the intersection of two geometries
CG_Intersects — Tests if two geometries intersect (they have at least one point in common)
CG_3DIntersects — Tests if two 3D geometries intersect
CG_Difference — Computes the geometric difference between two geometries
CG_3DDifference — Representar diferença 3D
CG_Distance — Computes the minimum distance between two geometries
CG_3DDistance — Computes the minimum 3D distance between two geometries
CG_3DConvexHull — Computa o eixo mediano aproximado de uma geometria territorial.
CG_3DIntersection — Representar intersecção 3D
CG_Union — Computes the union of two geometries
CG_3DUnion — Perform 3D union using postgis_sfcgal.
CG_AlphaShape — Computes an Alpha-shape enclosing a geometry
CG_ApproxConvexPartition — Computes approximal convex partition of the polygon geometry
CG_ApproximateMedialAxis — Computa o eixo mediano aproximado de uma geometria territorial.
CG_GenerateFlatRoof — Generate a flat (box) roof from a footprint polygon.
CG_GenerateHippedRoof — Generate a hipped roof from a footprint polygon.
CG_GenerateGableRoof — Generate a gable roof from a footprint polygon.
CG_GenerateSkillionRoof — Generate a skillion (single-slope) roof from a footprint polygon.
CG_GenerateRoof — Generate a roof of the requested type from a footprint polygon.
CG_PolygonRepair — Repair an invalid polygon or multipolygon.
CG_ConstrainedDelaunayTriangles — Return a constrained Delaunay triangulation around the given input geometry.
CG_Extrude — Extrude uma superfície a um volume relacionado
CG_ExtrudeStraightSkeleton — Straight Skeleton Extrusion
CG_GreeneApproxConvexPartition — Computes approximal convex partition of the polygon geometry
CG_MinkowskiSum — Representar soma Minkowski
CG_OptimalAlphaShape — Computes an Alpha-shape enclosing a geometry using an "optimal" alpha value.
CG_OptimalConvexPartition — Computes an optimal convex partition of the polygon geometry
CG_StraightSkeleton — Calcule um esqueleto em linha reta de uma geometria
CG_Tesselate — Representa superfície tesselação de um polígono ou superfície poliédrica e retorna como uma TIN ou coleção de TINS
CG_Triangulate — Triangulates a polygonal geometry
CG_Visibility — Compute a visibility polygon from a point or a segment in a polygon geometry
CG_YMonotonePartition — Computes y-monotone partition of the polygon geometry
CG_StraightSkeletonPartition — Computes the straight skeleton partition of a polygon.
CG_3DBuffer — Computes a 3D buffer around a geometry.
CG_Rotate — Rotates a geometry by a given angle around the origin (0,0).
CG_2DRotate — Rotates a geometry by a given angle around a specified point in 2D.
CG_3DRotate — Rotates a geometry in 3D space around an axis vector.
CG_RotateX — Rotates a geometry around the X-axis by a given angle.
CG_RotateY — Rotates a geometry around the Y-axis by a given angle.
CG_RotateZ — Rotates a geometry around the Z-axis by a given angle.
CG_Scale — Scales a geometry uniformly in all dimensions by a given factor.
CG_3DScale — Scales a geometry by separate factors along X, Y, and Z axes.
CG_3DScaleAroundCenter — Scales a geometry in 3D space around a specified center point.
CG_Translate — Translates (moves) a geometry by given offsets in 2D space.
CG_3DTranslate — Translates (moves) a geometry by given offsets in 3D space.
CG_Simplify — Reduces the complexity of a geometry while preserving essential features and Z/M values.
CG_3DAlphaWrapping — Computes a 3D Alpha-wrapping strictly enclosing a geometry.
CG_NurbsCurveInterpolate — Creates an interpolating NURBS curve passing through all given data points
CG_NurbsCurveApproximate — Creates an approximating NURBS curve fitting data points within a tolerance
CG_NurbsCurveDerivative — Computes the derivative (tangent, curvature) of a NURBS curve at a given parameter

8.4. Deprecated SFCGAL Function Aliases

ST_3DIntersection — Deprecated alias for CG_3DIntersection.
ST_3DDifference — Deprecated alias for CG_3DDifference.
ST_3DUnion — Deprecated alias for CG_3DUnion.
ST_Tesselate — Deprecated alias for CG_Tesselate.
ST_3DArea — Deprecated alias for CG_3DArea.
ST_Extrude — Deprecated alias for CG_Extrude.
ST_ForceLHR — Deprecated alias for CG_ForceLHR.
ST_Orientation — Deprecated alias for CG_Orientation.
ST_MinkowskiSum — Deprecated alias for CG_MinkowskiSum.
ST_StraightSkeleton — Deprecated alias for CG_StraightSkeleton.
ST_ApproximateMedialAxis — Deprecated alias for CG_ApproximateMedialAxis.
ST_IsPlanar — Deprecated alias for CG_IsPlanar.
ST_Volume — Deprecated alias for CG_Volume.
ST_MakeSolid — Deprecated alias for CG_MakeSolid.
ST_IsSolid — Deprecated alias for CG_IsSolid.
ST_ConstrainedDelaunayTriangles — Deprecated alias for CG_ConstrainedDelaunayTriangles.
ST_3DConvexHull — Deprecated alias for CG_3DConvexHull.
ST_AlphaShape — Deprecated alias for CG_AlphaShape.
ST_OptimalAlphaShape — Deprecated alias for CG_OptimalAlphaShape.

These ST_ names remain available for compatibility and emit deprecation notices. Their entries contain only the legacy signature and migration link. Use the corresponding CG_ pages for behavior, examples, and geometry support details.

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