计算模型的边界

#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <igl/boundary_loop.h>
#include <igl/list_to_matrix.h>

int main()
{
	std::vector<std::vector<int> > Indices;
	Indices.push_back({ 0, 1, 2 });
	Indices.push_back({ 1, 3, 2 });

	Eigen::MatrixXi MatrixI;
	if (igl::list_to_matrix(Indices, MatrixI))
	{
		std::vector<std::vector<int> > Boundarys;
		igl::boundary_loop(MatrixI, Boundarys);
		for (const auto& Boundary : Boundarys)
		{
			for (const auto& Index : Boundary)
			{
				std::cout << Index << ", ";
			}
		}
	}
}