# Deprecated SFCGAL Function Aliases

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.

ST_3DIntersection

Deprecated alias for `CG_3DIntersection`.

                        geometry ST_3DIntersection
                        geometry geom1
                        geometry geom2

### Description

`ST_3DIntersection` is deprecated as of 3.5.0. Use CG_3DIntersection instead.

Availability: 2.1.0

&sfcgal_required;

ST_3DDifference

Deprecated alias for `CG_3DDifference`.

                        geometry ST_3DDifference
                        geometry geom1
                        geometry geom2

### Description

`ST_3DDifference` is deprecated as of 3.5.0. Use CG_3DDifference instead.

Availability: 2.2.0

&sfcgal_required;

ST_3DUnion

Deprecated alias for `CG_3DUnion`.

                        geometry ST_3DUnion
                        geometry geom1
                        geometry geom2

                        geometry ST_3DUnion
                        geometry set g1field

### Description

`ST_3DUnion` is deprecated as of 3.5.0. Use CG_3DUnion instead.

Availability: 2.2.0

&sfcgal_required;

ST_Tesselate

Deprecated alias for `CG_Tesselate`.

                        geometry ST_Tesselate
                        geometry geom

### Description

`ST_Tesselate` is deprecated as of 3.5.0. Use CG_Tesselate instead.

Availability: 2.1.0

&sfcgal_required;

ST_3DArea

Deprecated alias for `CG_3DArea`.

                        floatST_3DArea
                        geometry geom1

### Description

`ST_3DArea` is deprecated as of 3.5.0. Use CG_3DArea instead.

Availability: 2.1.0

&sfcgal_required;

ST_Extrude

Deprecated alias for `CG_Extrude`.

                        geometry ST_Extrude
                        geometry geom
                        float x
                        float y
                        float z

### Description

`ST_Extrude` is deprecated as of 3.5.0. Use CG_Extrude instead.

Availability: 2.1.0

&sfcgal_required;

ST_ForceLHR

Deprecated alias for `CG_ForceLHR`.

                        geometry ST_ForceLHR
                        geometry geom

### Description

`ST_ForceLHR` is deprecated as of 3.5.0. Use CG_ForceLHR instead.

Availability: 2.1.0

&sfcgal_required;

ST_Orientation

Deprecated alias for `CG_Orientation`.

                        integer ST_Orientation
                        geometry geom

### Description

`ST_Orientation` is deprecated as of 3.5.0. Use CG_Orientation instead.

Availability: 2.1.0

&sfcgal_required;

ST_MinkowskiSum

Deprecated alias for `CG_MinkowskiSum`.

                        geometry ST_MinkowskiSum
                        geometry geom1
                        geometry geom2

### Description

`ST_MinkowskiSum` is deprecated as of 3.5.0. Use CG_MinkowskiSum instead.

Availability: 2.1.0

&sfcgal_required;

ST_StraightSkeleton

Deprecated alias for `CG_StraightSkeleton`.

                        geometry ST_StraightSkeleton
                        geometry geom

### Description

`ST_StraightSkeleton` is deprecated as of 3.1.0. Use CG_StraightSkeleton instead.

Like `CG_StraightSkeleton`, this function ignores the Z dimension and always gives a 2D result, even when used on a 3D geometry.

Availability: 2.1.0

&sfcgal_required;

ST_ApproximateMedialAxis

Deprecated alias for `CG_ApproximateMedialAxis`.

                        geometry ST_ApproximateMedialAxis
                        geometry geom

### Description

`ST_ApproximateMedialAxis` is deprecated as of 3.5.0. Use CG_ApproximateMedialAxis instead.

Like `CG_ApproximateMedialAxis`, this function ignores the Z dimension and always gives a 2D result, even when used on a 3D geometry.

Availability: 2.2.0

&sfcgal_required;

ST_IsPlanar

Deprecated alias for `CG_IsPlanar`.

                        boolean ST_IsPlanar
                        geometry geom

### Description

`ST_IsPlanar` is deprecated as of 3.5.0. Use CG_IsPlanar instead.

Availability: 2.2.0: This was documented in 2.1.0 but got accidentally left out in 2.1 release.

&sfcgal_required;

ST_Volume

Deprecated alias for `CG_Volume`.

                        float ST_Volume
                        geometry geom1

### Description

`ST_Volume` is deprecated as of 3.5.0. Use CG_Volume instead.

Availability: 2.2.0

&sfcgal_required;

ST_MakeSolid

Deprecated alias for `CG_MakeSolid`.

                        geometry ST_MakeSolid
                        geometry geom1

### Description

`ST_MakeSolid` is deprecated as of 3.5.0. Use CG_MakeSolid instead.

Availability: 2.2.0

&sfcgal_required;

ST_IsSolid

Deprecated alias for `CG_IsSolid`.

                        boolean ST_IsSolid
                        geometry geom1

### Description

`ST_IsSolid` is deprecated as of 3.5.0. Use CG_IsSolid instead.

Availability: 2.2.0

&sfcgal_required;

ST_ConstrainedDelaunayTriangles

Deprecated alias for `CG_ConstrainedDelaunayTriangles`.

                        geometry ST_ConstrainedDelaunayTriangles
                        geometry  g1

### Description

`ST_ConstrainedDelaunayTriangles` is deprecated as of 3.5.0. Use CG_ConstrainedDelaunayTriangles instead.

Availability: 3.0.0

&sfcgal_required;

ST_3DConvexHull

Deprecated alias for `CG_3DConvexHull`.

                        geometry ST_3DConvexHull
                        geometry geom1

### Description

`ST_3DConvexHull` is deprecated as of 3.5.0. Use CG_3DConvexHull instead.

Availability: 3.3.0

&sfcgal_required;

ST_AlphaShape

Deprecated alias for `CG_AlphaShape`.

                        geometry ST_AlphaShape
                        geometry geom

                            float
                            alpha

                            boolean
                            allow_holes = false

### Description

`ST_AlphaShape` is deprecated as of 3.5.0. Use CG_AlphaShape instead.

&sfcgal_required;

ST_OptimalAlphaShape

Deprecated alias for `CG_OptimalAlphaShape`.

                        geometry ST_OptimalAlphaShape
                        geometry geom

                            boolean
                            allow_holes = false

                            integer
                            nb_components = 1

### Description

`ST_OptimalAlphaShape` is deprecated as of 3.5.0. Use CG_OptimalAlphaShape instead.

Availability: 3.3.0 - requires SFCGAL >= 1.4.1.

&sfcgal_required;