发布关于PostGIS对于USD格式的拓展

我们非常高兴的发布为了一年一度的SIGGRAPH 2023发布关于为PostGIS支持USD格式的新拓展。

新添加了3个函数

ST_AsUSDA(geom geometry, usd_root_name text, usd_geom_name text, width float)

ST_AsUSDC(geom geometry, usd_root_name text, usd_geom_name text, width float)

ST_GeomFromUSD(format int, content bytea)

函数ST_AsUSDA和ST_AsUSDC用于转换PostGIS的geometry为USD数据，可以是文本格式的USDA用于调试，或者是紧凑的二进制USDC格式。所有的参数解释如下。

geom, 输入PostGIS几何体
usd_root_name text, USD默认Prim的名字，默认为World
usd_geom_name text, 生成的USD对象Prim名字，默认为_geometry
width, 默认为1.0，对于点Point和线Curve类似的geomtry, 此参数设置其宽度

ST_GeomFromUSD用于转换USD文件到GEOMETRYCOLLECTION，

format，设置为1，输入内容为USDA，设置为2，为二进制USDC

代码仓库

https://github.com/j-cube/postgis

分支

bo-dev-usd

编译和安装的方式等同于PostGIS，一切按照PostGIS文档所描述进行即可。

感谢香港特新科技对本项目的赞助和支持。

---

We're happy to annouce that the USD format in PostGIS is working for SIGGRAP 2023.

There are 3 major functions were created,

ST_AsUSDA(geom geometry, usd_root_name text, usd_geom_name text, width float)

ST_AsUSDC(geom geometry, usd_root_name text, usd_geom_name text, width float)

ST_GeomFromUSD(format int, content bytea)

The function ST_AsUSDA and ST_AsUSDC are used convert a PostGIS geometry to USD content, either in ASCII(USDA) format or binary Crate format(USDC). Both of them supports all geometry type. Here is the explanation for all arguments.

geom, the PostGIS geometry
usd_root_name text, default value is "World", generated USD has default prim with same name
usd_geom_name text, default value is "_geometry", if a geometry contains sub-geometry, the all geometry object will be created with flatten USD prims with this name
width, default value is 1.0, for Point or Curve-like geometry, it sets the USD width at USD geometry

ST_GeomFromUSD is is used to convert a USD content back to a set of geometry wrapped by GEOMETRYCOLLECTION.

format = 1 when content is USDA, format = 2 for USDC

Repository

https://github.com/j-cube/postgis

Branch

bo-dev-usd

Build and test as PostGIS document described.

Thanks for the support from Jadason Technology Ltd for this project.

发布关于PostGIS对于USD格式的拓展的相关教程结束。