CMake ExternalProject

Hi,

How you download Polyscope with its main dependencies using CMake ExternalProject command:

https://cmake.org/cmake/help/latest/module/ExternalProject.html

This is a command that downloads github repository. But it must be setup so that dependencies are included and built. Do you have any example using it?

I use this command to download Eigen, Boost, CGAL and would like to add Polyscope in the same workflow, but it is out of my learning knowledge since it is not a header only library. This is one example how I use this command in my CMake projects: https://github.com/petrasvestartas/CMAKE/blob/main/super_build/example_eigen/CMakeLists.txt

从链接的 CMake ExternalProject 文档以及所引用 repository 中的示例 CMakeLists.txt 开始。确定应如何将 Polyscope、Eigen、Boost 和 CGAL 一起下载并构建。完成的标准是提供一个针对该依赖工作流、经过文档说明且可正常运行的 ExternalProject 示例。