你还可以创建一个环境光源以产生无方向性的光，或者点光源，如果你想对你场景中的特定区域聚焦。

You can also create an AmbientLight which will produce a directionless light, or a SpotLight if you want to focus on a particular part of your scene.

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内部调用（对 ST_Point()）创建一个具有纬度-经度坐标（SRID = 1）的点几何值。

The inner call, to ST_Point(), creates a point geometry with latitude-longitude coordinates (SRID = 1).

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如果您希望为其他人提供一些功能，那么可以创建一个扩展点，通过对它创建扩展，其他插件就可以链接到这个扩展点。

If you have functionality that you want to provide to others, you can create an extension point that another plug-in can link to by creating an extension to it.

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