名称
ST_AsX3D — 返回 X3D xml 节点元素格式的几何图形：ISO-IEC-19776-1.2-X3DEncodings-XML
大纲
text ST_AsX3D(geometry g1, integer maxdecimaldigits=15, integer options=0);
描述
以 X3D xml 格式的节点元素形式返回几何图形 http://www.web3d.org/standards/number/19776-1。 如果未指定 maxdecimaldigits（精度），则默认为 15。
![[注意]](../images/note.png)
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有多种选项可用于将 PostGIS 几何图形转换为 X3D，因为 X3D 几何类型不会直接映射到 PostGIS 几何类型，而一些较新的 X3D 类型可能是我们避免的更好的映射，因为大多数渲染工具当前不支持它们。 这些是我们已经确定的映射。 如果您对我们允许人们表示他们首选映射的想法或方式有任何想法，请随时发布错误通知单。 以下是我们目前如何将 PostGIS 2D/3D 类型映射到 X3D 类型 |
options 参数是一个位字段，用于控制是否使用 X3D 的 GeoCoordinates 节点来表示坐标，以及是否进行 x/y 轴翻转。默认情况下，ST_AsX3D 按数据库方式输出（long,lat 或 X,Y），但如果需要，也可以采用 X3D 默认的 lat/lon、y/x 输出形式。
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0：数据库顺序中的 X/Y（例如，经/纬度 = X,Y 是标准数据库顺序）、默认值和非空间坐标（只是常规的旧坐标标签）。
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1：翻转X和Y。如果与地理坐标选项开关结合使用，则输出将默认为“latitude_first”，并且坐标也会翻转。
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2：GeoSpatial GeoCoordinates 中的输出坐标。 如果几何图形不在 WGS 84 长纬度 (srid: 4326) 中，此选项将引发错误。 这是目前唯一支持的地理坐标类型。 请参阅指定空间参考系统的 X3D 规范。默认输出将为
GeoCoordinate geoSystem='"GD" "WE" "longitude_first"'。 如果您更喜欢GeoCoordinate geoSystem='"GD" "WE" "latitude_first"'的 X3D 默认值，请使用(2+1)=3
| PostGIS类型 | 2D X3D类型 | 3D X3D类型 |
|---|---|---|
| LINESTRING | LineSet (coordinates are promoted to 3D) | LineSet |
| MULTILINESTRING | IndexedLineSet (coordinates are promoted to 3D) | IndexedLineSet |
| MULTIPOINT | Polypoint2D | PointSet |
| POINT | 输出以空格分隔的坐标 | 输出以空格分隔的坐标 |
| (MULTI) POLYGON, POLYHEDRALSURFACE | IndexedFaceSet (coordinates are promoted to 3D; inner rings currently output as another faceset) | IndexedFaceSet（内环当前输出为另一个面集） |
| TIN | TriangleSet2D（尚未实现） | IndexedTriangleSet（索引三角形集） |
| CIRCULARSTRING, COMPOUNDCURVE, CURVEPOLYGON, MULTICURVE, MULTISURFACE | linearized, then emitted with the linear geometry mapping | linearized, then emitted with the linear geometry mapping |
| NURBSCURVE | NurbsCurve with controlPoint, knot, weight, and order fields | NurbsCurve with controlPoint, knot, weight, and order fields |
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2D 几何支持尚未完成。 内环当前仅绘制为单独的多边形。 我们正在研究这些。 |
M coordinates are not represented in X3D output.
3D 空间中发生了许多进步，特别是 X3D 与 HTML5 的集成
还有一个很好的开源 X3D 查看器，您可以使用它来查看渲染的几何图形。 Free Wrl http://freewrl.sourceforge.net/ 二进制文件适用于 Mac、Linux 和 Windows。 使用打包的 FreeWRL_Launcher 来查看几何图形。
另请查看利用此功能的 PostGIS 简约 X3D 查看器和 x3dDom html/js 开源工具包。
可用性： 2.0.0： ISO-IEC-19776-1.2-X3DEncodings-XML
增强：2.2.0：添加了对反转地理坐标和轴（x/y、经度/纬度）的支持。 有关详细信息，请参阅选项。
Enhanced: 3.7.0: Support for curve geometries. NURBSCURVE is emitted as X3D NurbsCurve; other curve types are linearized before output.
该函数支持 3d 并且不会丢失 z-index。
该函数支持多面体曲面。
此函数支持三角形和不规则三角网面 (TIN)。
示例
Create a complete X3D document containing a cube that is viewable in FreeWRL and other X3D viewers.
Code
SELECT '<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 3.0//EN" "http://www.web3d.org/specifications/x3d-3.0.dtd">
<X3D>
<Scene>
<Transform>
<Shape>
<Appearance>
<Material emissiveColor=''0 0 1''/>
</Appearance
> ' ||
ST_AsX3D(ST_GeomFromEWKT('POLYHEDRALSURFACE( ((0 0 0, 0 0 1, 0 1 1, 0 1 0, 0 0 0)),
((0 0 0, 0 1 0, 1 1 0, 1 0 0, 0 0 0)), ((0 0 0, 1 0 0, 1 0 1, 0 0 1, 0 0 0)),
((1 1 0, 1 1 1, 1 0 1, 1 0 0, 1 1 0)),
((0 1 0, 0 1 1, 1 1 1, 1 1 0, 0 1 0)), ((0 0 1, 1 0 1, 1 1 1, 0 1 1, 0 0 1)) )')) ||
'</Shape>
</Transform>
</Scene>
</X3D
>' As x3ddoc;
栅格输出
x3ddoc
--------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE X3D PUBLIC "ISO//Web3D//DTD X3D 3.0//EN" "http://www.web3d.org/specifications/x3d-3.0.dtd">
<X3D>
<Scene>
<Transform>
<Shape>
<Appearance>
<Material emissiveColor='0 0 1'/>
</Appearance>
<IndexedFaceSet coordIndex='0 1 2 3 -1 4 5 6 7 -1 8 9 10 11 -1 12 13 14 15 -1 16 17 18 19 -1 20 21 22 23'>
<Coordinate point='0 0 0 0 0 1 0 1 1 0 1 0 0 0 0 0 1 0 1 1 0 1 0 0 0 0 0 1 0 0 1 0 1 0 0 1 1 1 0 1 1 1 1 0 1 1 0 0 0 1 0 0 1 1 1 1 1 1 1 0 0 0 1 1 0 1 1 1 1 0 1 1' />
</IndexedFaceSet>
</Shape>
</Transform>
</Scene>
</X3D>
PostGIS buildings.
将此查询的输出复制并粘贴到 x3d 场景查看器，然后单击“显示”
Code
SELECT string_agg('<Shape
>' || ST_AsX3D(CG_Extrude(geom, 0,0, i*0.5)) ||
'<Appearance>
<Material diffuseColor="' || (0.01*i)::text || ' 0.8 0.2" specularColor="' || (0.05*i)::text || ' 0 0.5"/>
</Appearance>
</Shape
>', '')
FROM ST_Subdivide(ST_Letters('PostGIS'),20) WITH ORDINALITY AS f(geom,i);
The following preview shows the extruded geometry generated from a simplified version of the same source lettering. It is a geometry preview, not X3D markup; use the preceding ST_AsX3D query output in an X3D viewer to inspect the native X3D scene.
Code
SELECT
CG_Extrude(
ST_SimplifyPreserveTopology(ST_Letters('PostGIS'), 2),
0, 0, 10
) AS buildings;
栅格输出
GEOMETRYCOLLECTION Z (POLYHEDRALSURFACE Z (((42.6 39.2 0,36.3 24.5 0,17 20.3 0,17.9 0 0,0 0 0,0 73.8 0,27.3 73.6 0,36.3 70 0,41.8 61.6 0,42.6 39.2 0),(26.5 55.7 0,17 58.8 0,17 35.3 0,25.6 36.2 0,26.5 55.7 0)),((42.6 39.2 10,41.8 61.6 10,36.3 70 10,27.3 73.6 10,0 73.8 10,0 0 10,17.9 0 10,17 20.3 10,36.3 24.5 10,42.6 39.2 10),(26.5 55.7 10,25.6 36.2 10,17 35.3 10,17 58.8 10,26.5 55.7 10)),((42.6 39.2 0,42.6 39.2 10,36.3 24.5 10,36.3 24.5 0,42.6 39.2 0)),((36.3 24.5 0,36.3 24.5 10,17 20.3 10,17 20.3 0,36.3 24.5 0)),((17 20.3 0,17 20.3 10,17.9 0 10,17.9 0 0,17 20.3 0)),((17.9 0 0,17.9 0 10,0 0 10,0 0 0,17.9 0 0)),((0 0 0,0 0 10,0 73.8 10,0 73.8 0,0 0 0)),((0 73.8 0,0 73.8 10,27.3 73.6 10,27.3 73.6 0,0 73.8 0)),((27.3 73.6 0,27.3 73.6 10,36.3 70 10,36.3 70 0,27.3 73.6 0)),((36.3 70 0,36.3 70 10,41.8 61.6 10,41.8 61.6 0,36.3 70 0)),((41.8 61.6 0,41.8 61.6 10,42.6 39.2 10,42.6 39.2 0,41.8 61.6 0)),((26.5 55.7 0,26.5 55.7 10,17 58.8 10,17 58.8 0,26.5 55.7 0)),((17 58.8 0,17 58.8 10,17 35.3 10,17 35.3 0,17 58.8 0)),((17 35.3 0,17 35.3 10,25.6 36.2 10,25.6 36.2 0,17 35.3 0)),((25.6 36.2 0,25.6 36.2 10,26.5 55.7 10,26.5 55.7 0,25.6 36.2 0))),POLYHEDRALSURFACE Z (((69.01 58 0,84.51 52.5 0,89.71 39.9 0,87.81 9.7 0,81.71 2.9 0,71.31 -0.5 0,54.91 3.9 0,48.31 17.8 0,50.61 48.7 0,58.01 55.6 0,69.01 58 0),(73.91 38.9 0,69.11 42.6 0,64.21 38.9 0,64.21 18.9 0,68.91 15.2 0,73.91 18.9 0,73.91 38.9 0)),((69.01 58 10,58.01 55.6 10,50.61 48.7 10,48.31 17.8 10,54.91 3.9 10,71.31 -0.5 10,81.71 2.9 10,87.81 9.7 10,89.71 39.9 10,84.51 52.5 10,69.01 58 10),(73.91 38.9 10,73.91 18.9 10,68.91 15.2 10,64.21 18.9 10,64.21 38.9 10,69.11 42.6 10,73.91 38.9 10)),((69.01 58 0,69.01 58 10,84.51 52.5 10,84.51 52.5 0,69.01 58 0)),((84.51 52.5 0,84.51 52.5 10,89.71 39.9 10,89.71 39.9 0,84.51 52.5 0)),((89.71 39.9 0,89.71 39.9 10,87.81 9.7 10,87.81 9.7 0,89.71 39.9 0)),((87.81 9.7 0,87.81 9.7 10,81.71 2.9 10,81.71 2.9 0,87.81 9.7 0)),((81.71 2.9 0,81.71 2.9 10,71.31 -0.5 10,71.31 -0.5 0,81.71 2.9 0)),((71.31 -0.5 0,71.31 -0.5 10,54.91 3.9 10,54.91 3.9 0,71.31 -0.5 0)),((54.91 3.9 0,54.91 3.9 10,48.31 17.8 10,48.31 17.8 0,54.91 3.9 0)),((48.31 17.8 0,48.31 17.8 10,50.61 48.7 10,50.61 48.7 0,48.31 17.8 0)),((50.61 48.7 0,50.61 48.7 10,58.01 55.6 10,58.01 55.6 0,50.61 48.7 0)),((58.01 55.6 0,58.01 55.6 10,69.01 58 10,69.01 58 0,58.01 55.6 0)),((73.91 38.9 0,73.91 38.9 10,69.11 42.6 10,69.11 42.6 0,73.91 38.9 0)),((69.11 42.6 0,69.11 42.6 10,64.21 38.9 10,64.21 38.9 0,69.11 42.6 0)),((64.21 38.9 0,64.21 38.9 10,64.21 18.9 10,64.21 18.9 0,64.21 38.9 0)),((64.21 18.9 0,64.21 18.9 10,68.91 15.2 10,68.91 15.2 0,64.21 18.9 0)),((68.91 15.2 0,68.91 15.2 10,73.91 18.9 10,73.91 18.9 0,68.91 15.2 0)),((73.91 18.9 0,73.91 18.9 10,73.91 38.9 10,73.91 38.9 0,73.91 18.9 0))),POLYHEDRALSURFACE Z (((111.02 37.6 0,123.92 31.1 0,130.72 20.8 0,126.82 5.3 0,116.02 -0.3 0,94.02 3.7 0,98.82 18.9 0,112.52 15.3 0,115.02 17.6 0,98.72 29.6 0,96.12 45.4 0,100.52 53 0,107.32 57.1 0,128.92 54.7 0,122.72 39.9 0,112.02 42.1 0,111.02 37.6 0)),((111.02 37.6 10,112.02 42.1 10,122.72 39.9 10,128.92 54.7 10,107.32 57.1 10,100.52 53 10,96.12 45.4 10,98.72 29.6 10,115.02 17.6 10,112.52 15.3 10,98.82 18.9 10,94.02 3.7 10,116.02 -0.3 10,126.82 5.3 10,130.72 20.8 10,123.92 31.1 10,111.02 37.6 10)),((111.02 37.6 0,111.02 37.6 10,123.92 31.1 10,123.92 31.1 0,111.02 37.6 0)),((123.92 31.1 0,123.92 31.1 10,130.72 20.8 10,130.72 20.8 0,123.92 31.1 0)),((130.72 20.8 0,130.72 20.8 10,126.82 5.3 10,126.82 5.3 0,130.72 20.8 0)),((126.82 5.3 0,126.82 5.3 10,116.02 -0.3 10,116.02 -0.3 0,126.82 5.3 0)),((116.02 -0.3 0,116.02 -0.3 10,94.02 3.7 10,94.02 3.7 0,116.02 -0.3 0)),((94.02 3.7 0,94.02 3.7 10,98.82 18.9 10,98.82 18.9 0,94.02 3.7 0)),((98.82 18.9 0,98.82 18.9 10,112.52 15.3 10,112.52 15.3 0,98.82 18.9 0)),((112.52 15.3 0,112.52 15.3 10,115.02 17.6 10,115.02 17.6 0,112.52 15.3 0)),((115.02 17.6 0,115.02 17.6 10,98.72 29.6 10,98.72 29.6 0,115.02 17.6 0)),((98.72 29.6 0,98.72 29.6 10,96.12 45.4 10,96.12 45.4 0,98.72 29.6 0)),((96.12 45.4 0,96.12 45.4 10,100.52 53 10,100.52 53 0,96.12 45.4 0)),((100.52 53 0,100.52 53 10,107.32 57.1 10,107.32 57.1 0,100.52 53 0)),((107.32 57.1 0,107.32 57.1 10,128.92 54.7 10,128.92 54.7 0,107.32 57.1 0)),((128.92 54.7 0,128.92 54.7 10,122.72 39.9 10,122.72 39.9 0,128.92 54.7 0)),((122.72 39.9 0,122.72 39.9 10,112.02 42.1 10,112.02 42.1 0,122.72 39.9 0)),((112.02 42.1 0,112.02 42.1 10,111.02 37.6 10,111.02 37.6 0,112.02 42.1 0))),POLYHEDRALSURFACE Z (((156.82 17.7 0,167.02 16 0,167.02 -0.9 0,149.22 2 0,141.42 11.3 0,141.12 42.7 0,134.62 41.8 0,134.62 58.9 0,141.12 57.9 0,140.02 75.4 0,157.92 75.4 0,156.82 57.9 0,166.02 58.9 0,166.02 41.8 0,156.82 42.7 0,156.82 17.7 0)),((156.82 17.7 10,156.82 42.7 10,166.02 41.8 10,166.02 58.9 10,156.82 57.9 10,157.92 75.4 10,140.02 75.4 10,141.12 57.9 10,134.62 58.9 10,134.62 41.8 10,141.12 42.7 10,141.42 11.3 10,149.22 2 10,167.02 -0.9 10,167.02 16 10,156.82 17.7 10)),((156.82 17.7 0,156.82 17.7 10,167.02 16 10,167.02 16 0,156.82 17.7 0)),((167.02 16 0,167.02 16 10,167.02 -0.9 10,167.02 -0.9 0,167.02 16 0)),((167.02 -0.9 0,167.02 -0.9 10,149.22 2 10,149.22 2 0,167.02 -0.9 0)),((149.22 2 0,149.22 2 10,141.42 11.3 10,141.42 11.3 0,149.22 2 0)),((141.42 11.3 0,141.42 11.3 10,141.12 42.7 10,141.12 42.7 0,141.42 11.3 0)),((141.12 42.7 0,141.12 42.7 10,134.62 41.8 10,134.62 41.8 0,141.12 42.7 0)),((134.62 41.8 0,134.62 41.8 10,134.62 58.9 10,134.62 58.9 0,134.62 41.8 0)),((134.62 58.9 0,134.62 58.9 10,141.12 57.9 10,141.12 57.9 0,134.62 58.9 0)),((141.12 57.9 0,141.12 57.9 10,140.02 75.4 10,140.02 75.4 0,141.12 57.9 0)),((140.02 75.4 0,140.02 75.4 10,157.92 75.4 10,157.92 75.4 0,140.02 75.4 0)),((157.92 75.4 0,157.92 75.4 10,156.82 57.9 10,156.82 57.9 0,157.92 75.4 0)),((156.82 57.9 0,156.82 57.9 10,166.02 58.9 10,166.02 58.9 0,156.82 57.9 0)),((166.02 58.9 0,166.02 58.9 10,166.02 41.8 10,166.02 41.8 0,166.02 58.9 0)),((166.02 41.8 0,166.02 41.8 10,156.82 42.7 10,156.82 42.7 0,166.02 41.8 0)),((156.82 42.7 0,156.82 42.7 10,156.82 17.7 10,156.82 17.7 0,156.82 42.7 0))),POLYHEDRALSURFACE Z (((213.81 13.2 0,208.11 4.2 0,198.51 -0.3 0,184.21 0.9 0,174.91 8.8 0,172.61 57.4 0,175.21 66.1 0,180.91 71.6 0,209.81 74 0,209.81 58.4 0,189.11 56.8 0,188.61 18.7 0,193.81 14.8 0,199.11 16.5 0,199.11 32.2 0,193.41 32.2 0,193.41 46.4 0,213.81 46.4 0,213.81 13.2 0)),((213.81 13.2 10,213.81 46.4 10,193.41 46.4 10,193.41 32.2 10,199.11 32.2 10,199.11 16.5 10,193.81 14.8 10,188.61 18.7 10,189.11 56.8 10,209.81 58.4 10,209.81 74 10,180.91 71.6 10,175.21 66.1 10,172.61 57.4 10,174.91 8.8 10,184.21 0.9 10,198.51 -0.3 10,208.11 4.2 10,213.81 13.2 10)),((213.81 13.2 0,213.81 13.2 10,208.11 4.2 10,208.11 4.2 0,213.81 13.2 0)),((208.11 4.2 0,208.11 4.2 10,198.51 -0.3 10,198.51 -0.3 0,208.11 4.2 0)),((198.51 -0.3 0,198.51 -0.3 10,184.21 0.9 10,184.21 0.9 0,198.51 -0.3 0)),((184.21 0.9 0,184.21 0.9 10,174.91 8.8 10,174.91 8.8 0,184.21 0.9 0)),((174.91 8.8 0,174.91 8.8 10,172.61 57.4 10,172.61 57.4 0,174.91 8.8 0)),((172.61 57.4 0,172.61 57.4 10,175.21 66.1 10,175.21 66.1 0,172.61 57.4 0)),((175.21 66.1 0,175.21 66.1 10,180.91 71.6 10,180.91 71.6 0,175.21 66.1 0)),((180.91 71.6 0,180.91 71.6 10,209.81 74 10,209.81 74 0,180.91 71.6 0)),((209.81 74 0,209.81 74 10,209.81 58.4 10,209.81 58.4 0,209.81 74 0)),((209.81 58.4 0,209.81 58.4 10,189.11 56.8 10,189.11 56.8 0,209.81 58.4 0)),((189.11 56.8 0,189.11 56.8 10,188.61 18.7 10,188.61 18.7 0,189.11 56.8 0)),((188.61 18.7 0,188.61 18.7 10,193.81 14.8 10,193.81 14.8 0,188.61 18.7 0)),((193.81 14.8 0,193.81 14.8 10,199.11 16.5 10,199.11 16.5 0,193.81 14.8 0)),((199.11 16.5 0,199.11 16.5 10,199.11 32.2 10,199.11 32.2 0,199.11 16.5 0)),((199.11 32.2 0,199.11 32.2 10,193.41 32.2 10,193.41 32.2 0,199.11 32.2 0)),((193.41 32.2 0,193.41 32.2 10,193.41 46.4 10,193.41 46.4 0,193.41 32.2 0)),((193.41 46.4 0,193.41 46.4 10,213.81 46.4 10,213.81 46.4 0,193.41 46.4 0)),((213.81 46.4 0,213.81 46.4 10,213.81 13.2 10,213.81 13.2 0,213.81 46.4 0))),POLYHEDRALSURFACE Z (((235.82 72.9 0,236.82 0 0,218.52 0 0,218.52 73.8 0,235.82 72.9 0)),((235.82 72.9 10,218.52 73.8 10,218.52 0 10,236.82 0 10,235.82 72.9 10)),((235.82 72.9 0,235.82 72.9 10,236.82 0 10,236.82 0 0,235.82 72.9 0)),((236.82 0 0,236.82 0 10,218.52 0 10,218.52 0 0,236.82 0 0)),((218.52 0 0,218.52 0 10,218.52 73.8 10,218.52 73.8 0,218.52 0 0)),((218.52 73.8 0,218.52 73.8 10,235.82 72.9 10,235.82 72.9 0,218.52 73.8 0))),POLYHEDRALSURFACE Z (((258.33 49.5 0,279.93 34.6 0,283.43 25.9 0,282.53 15.4 0,277.93 6.8 0,270.73 1.6 0,252.33 0.5 0,241.53 4.9 0,246.43 20.6 0,260.73 16.4 0,266.23 18.7 0,267.43 23.2 0,245.63 39.4 0,242.03 48.6 0,242.83 59.6 0,247.53 67.3 0,257.53 73.2 0,280.43 70.8 0,275.23 56.4 0,264.53 58.3 0,258.73 55.1 0,258.33 49.5 0)),((258.33 49.5 10,258.73 55.1 10,264.53 58.3 10,275.23 56.4 10,280.43 70.8 10,257.53 73.2 10,247.53 67.3 10,242.83 59.6 10,242.03 48.6 10,245.63 39.4 10,267.43 23.2 10,266.23 18.7 10,260.73 16.4 10,246.43 20.6 10,241.53 4.9 10,252.33 0.5 10,270.73 1.6 10,277.93 6.8 10,282.53 15.4 10,283.43 25.9 10,279.93 34.6 10,258.33 49.5 10)),((258.33 49.5 0,258.33 49.5 10,279.93 34.6 10,279.93 34.6 0,258.33 49.5 0)),((279.93 34.6 0,279.93 34.6 10,283.43 25.9 10,283.43 25.9 0,279.93 34.6 0)),((283.43 25.9 0,283.43 25.9 10,282.53 15.4 10,282.53 15.4 0,283.43 25.9 0)),((282.53 15.4 0,282.53 15.4 10,277.93 6.8 10,277.93 6.8 0,282.53 15.4 0)),((277.93 6.8 0,277.93 6.8 10,270.73 1.6 10,270.73 1.6 0,277.93 6.8 0)),((270.73 1.6 0,270.73 1.6 10,252.33 0.5 10,252.33 0.5 0,270.73 1.6 0)),((252.33 0.5 0,252.33 0.5 10,241.53 4.9 10,241.53 4.9 0,252.33 0.5 0)),((241.53 4.9 0,241.53 4.9 10,246.43 20.6 10,246.43 20.6 0,241.53 4.9 0)),((246.43 20.6 0,246.43 20.6 10,260.73 16.4 10,260.73 16.4 0,246.43 20.6 0)),((260.73 16.4 0,260.73 16.4 10,266.23 18.7 10,266.23 18.7 0,260.73 16.4 0)),((266.23 18.7 0,266.23 18.7 10,267.43 23.2 10,267.43 23.2 0,266.23 18.7 0)),((267.43 23.2 0,267.43 23.2 10,245.63 39.4 10,245.63 39.4 0,267.43 23.2 0)),((245.63 39.4 0,245.63 39.4 10,242.03 48.6 10,242.03 48.6 0,245.63 39.4 0)),((242.03 48.6 0,242.03 48.6 10,242.83 59.6 10,242.83 59.6 0,242.03 48.6 0)),((242.83 59.6 0,242.83 59.6 10,247.53 67.3 10,247.53 67.3 0,242.83 59.6 0)),((247.53 67.3 0,247.53 67.3 10,257.53 73.2 10,257.53 73.2 0,247.53 67.3 0)),((257.53 73.2 0,257.53 73.2 10,280.43 70.8 10,280.43 70.8 0,257.53 73.2 0)),((280.43 70.8 0,280.43 70.8 10,275.23 56.4 10,275.23 56.4 0,280.43 70.8 0)),((275.23 56.4 0,275.23 56.4 10,264.53 58.3 10,264.53 58.3 0,275.23 56.4 0)),((264.53 58.3 0,264.53 58.3 10,258.73 55.1 10,258.73 55.1 0,264.53 58.3 0)),((258.73 55.1 0,258.73 55.1 10,258.33 49.5 10,258.33 49.5 0,258.73 55.1 0))))
Figure
An Octagon elevated 3 Units and decimal precision of 6.
Code
SELECT ST_AsX3D(ST_Translate(ST_Force3D(ST_Buffer(ST_Point(10,10),5, 'quad_segs=2')), 0,0,
3),
6) As x3dfrag;
栅格输出
x3dfrag -------- <IndexedFaceSet convex='false' coordIndex='0 1 2 3 4 5 6 7' ><Coordinate point='15 10 3 13.535534 6.464466 3 10 5 3 6.464466 6.464466 3 5 10 3 6.464466 13.535534 3 10 15 3 13.535534 13.535534 3 ' /></IndexedFaceSet>
TIN.
Code
SELECT ST_AsX3D(ST_GeomFromEWKT('TIN (((
0 0 0,
0 0 1,
0 1 0,
0 0 0
)), ((
0 0 0,
0 1 0,
1 1 0,
0 0 0
))
)')) As x3dfrag;
栅格输出
x3dfrag
--------
<IndexedTriangleSet index='0 1 2 3 4 5'
><Coordinate point='0 0 0 0 0 1 0 1 0 0 0 0 0 1 0 1 1 0'/></IndexedTriangleSet>
Closed multilinestring (the boundary of a polygon with holes).
Code
SELECT ST_AsX3D(ST_GeomFromEWKT('MULTILINESTRING((20 0 10,16 -12 10,0 -16 10,-12 -12 10,-20 0 10,-12 16 10,0 24 10,16 16 10,20 0 10),
(12 0 10,8 8 10,0 12 10,-8 8 10,-8 0 10,-8 -4 10,0 -8 10,8 -4 10,12 0 10))')
) As x3dfrag;
栅格输出
x3dfrag
--------
<IndexedLineSet coordIndex='0 1 2 3 4 5 6 7 0 -1 8 9 10 11 12 13 14 15 8'>
<Coordinate point='20 0 10 16 -12 10 0 -16 10 -12 -12 10 -20 0 10 -12 16 10 0 24 10 16 16 10 12 0 10 8 8 10 0 12 10 -8 8 10 -8 0 10 -8 -4 10 0 -8 10 8 -4 10 ' />
</IndexedLineSet>