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# Geometry 3D

Function Description
`ST_3DArea` Return a polygon's 3D area
`ST_3DLength` Return the 3D length of a Linestring
`ST_3DPerimeter` Return the 3D perimeter of a (multi)polygon
`ST_AddZ` Add a value to the z-coordinate of a Geometry
`ST_ConstrainedDelaunay` Compute a constrained Delaunay triangulation based on a geometry
`ST_Delaunay` Compute a Delaunay triangulation based on points
`ST_Drape` Drape a geometry to a set of triangles
`ST_Extrude` Extrude a geometry
`ST_Force3D` 2D Geometry → 3D Geometry
`ST_GeometryShadow` Compute the shadow footprint for a single geometry
`ST_Interpolate3DLine` Return a Geometry with a interpolation of z values.
`ST_Is3D` Return 1 if a Geometry has at least one z-coordinate; 0 otherwise
`ST_MultiplyZ` Return a Geometry's z-values by a factor
`ST_Reverse3DLine` Potentially reverse a Geometry according to the z-values of its first and last coordinates
`ST_SVF` Compute the Sky View Factor
`ST_SunPosition` Compute the sun position
`ST_Tessellate` Tessellate a set of Polygon with adaptive triangles
`ST_TriangleAspect` Return the aspect of a triangle
`ST_TriangleContouring` Split triangles into smaller triangles according to classes
`ST_TriangleDirection` Compute the direction of steepest ascent of a triangle
`ST_TriangleSlope` Compute the slope of a triangle as a percentage
`ST_UpdateZ` Update the z-values of a Geometry
`ST_Voronoi` Create a Voronoi diagram.
`ST_Z` Return the z-value of the first coordinate of a Geometry
`ST_ZMax` Return the maximum z-value of a Geometry
`ST_ZMin` Return the minimum z-value of a Geometry
`ST_ZUpdateLineExtremities` Update the start and end z-values of a Geometry

Documented functions: 27/27.