`libigl`更新到版本2.4.0后我无法再构建

Question

我的旧

CMakeLists.txt

测试项目的

libigl

文件包含以下部分：

project(libigl)

set(LIBIGL_HOME $ENV{HOME}/apps/libigl)
set(CMAKE_PREFIX_PATH ${LIBIGL_HOME})
set(CMAKE_MODULE_PATH ${LIBIGL_HOME}/cmake)
find_package(${PROJECT_NAME} CONFIGS libigl.cmake REQUIRED)

if(${PROJECT_NAME}_FOUND)
  message("-- Found ${PROJECT_NAME}")
else()
  message(FATAL_ERROR "${PROJECT_NAME} is not found")
endif()

我尝试使用

libigl

库的新版本 2.4.0 构建此项目并收到以下消息：

CMake Error at /home/hekto/apps/libigl/cmake/libigl.cmake:5 (message):
  You included libigl.cmake directly from your own project.  This behavior is
  not supported anymore.  Please add libigl to your project via
  add_subdirectory(<path_to_libigl>).  See the libigl example project for
  more information: https://github.com/libigl/libigl-example-project/
Call Stack (most recent call first):
  CMakeLists.txt:43 (find_package)

因此，他们建议对客户端项目使用

add_subdirectory

命令。我查看了推荐的 GitHub 示例项目中的

CMakeLists.txt

文件，找不到

add_subdirectory

命令：

cmake_minimum_required(VERSION 3.16)
project(example)

list(PREPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)

# Libigl
include(libigl)

# Enable the target igl::glfw
igl_include(glfw)

# Add your project files
file(GLOB SRC_FILES *.cpp)
add_executable(${PROJECT_NAME} ${SRC_FILES})
target_link_libraries(${PROJECT_NAME} PUBLIC igl::glfw)

我应该如何使用 2.4.0 的新版本

libigl

进行构建？

• 操作系统：Ubuntu 20.04.5 LTS
• 编译器：g++ (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0

Answer 1

只是为了在评论中结束讨论 - 也许，这个答案会对某人有所帮助......

所以，最小的

CMakeLists.txt

文件（它可以帮助我编译一个简单的测试，显示“兔子”网格）如下：

cmake_minimum_required(VERSION 3.10)

project(bunny)

set(CMAKE_PREFIX_PATH $ENV{HOME}/apps/CGAL/current)
find_package(CGAL CONFIG REQUIRED)

add_subdirectory($ENV{HOME}/apps/libigl/current ${CMAKE_BINARY_DIR}/libigl)

igl_include(copyleft cgal)
igl_include(glfw)

add_executable(bunny bunny.cpp)
target_link_libraries(bunny CGAL::CGAL igl::core igl::glfw)

您可以在这里看到，

CGAL

和

libigl

库都安装在我的主目录中。

CGAL

版本是6.0.1，

libigl

是2.4.0。如果系统目录中有这些库，那么

CMakeLists.txt

文件会更简单。来源

bunny.cpp

如下：

#include <Eigen/Dense>

#include <igl/read_triangle_mesh.h>
#include <igl/opengl/glfw/Viewer.h>

int main()
{
  Eigen::MatrixXd V;
  Eigen::MatrixXi F;
  // ------ load a mesh
  igl::read_triangle_mesh("data/bunny.off", V, F);
  // ------ plot the mesh
  igl::opengl::glfw::Viewer viewer;
  viewer.data().set_mesh(V, F);
  viewer.launch();
}

祝您好运

libigl

！