How to create a pyramid with openmesh

Construct a pyramid out of thin air as shown in the figure , The basic message is [V, E, F] = [5, 9, 6]

The coordinates of each point are A(0,0,1)  B(-1,1,0)  C(1,1,0)  D(1,-1,0)  E(-1,-1,0)

Determine the order in which patches are added AED->ACB->ADC->ABE->BDE->DBC

Be careful ： The order of adding points of each face should be that the normal vector facing outward relative to the face is counterclockwise

// IoTestPro.cpp :  This file contains  "main"  function . Program execution will start and end here .
//

#include <iostream>
#include <OpenMesh/Core/IO/MeshIO.hh>
#include <OpenMesh/Core/Mesh/TriMesh_ArraykernelT.hh>
#include <OpenMesh/Core/Mesh/PolyConnectivity.hh>

typedef OpenMesh::TriMesh_ArrayKernelT<> TriMesh;

int main()
{
	TriMesh mesh;// It is expected to be a pyramid 
	TriMesh::VertexHandle vhandle[5];// Handle array of points 
	std::vector<TriMesh::VertexHandle> face_vhandles;// A face contains multiple points 

	vhandle[0] = mesh.add_vertex(TriMesh::Point(0, 0, 2));// spot A
	vhandle[1] = mesh.add_vertex(TriMesh::Point(-1, 1, 0));// spot B
	vhandle[2] = mesh.add_vertex(TriMesh::Point(1, 1, 0));// spot C
	vhandle[3] = mesh.add_vertex(TriMesh::Point(1, -1, 0));// spot D
	vhandle[4] = mesh.add_vertex(TriMesh::Point(-1, -1, 0));// spot E
    
	// Structural plane AED And add mesh
	face_vhandles.push_back(vhandle['A' - 65]);
	face_vhandles.push_back(vhandle['E' - 65]);
	face_vhandles.push_back(vhandle['D' - 65]);
	mesh.add_face(face_vhandles);

	// Structural plane ACB And add mesh
	face_vhandles.clear();
	face_vhandles.push_back(vhandle['A' - 65]);
	face_vhandles.push_back(vhandle['C' - 65]);
	face_vhandles.push_back(vhandle['B' - 65]);
	mesh.add_face(face_vhandles);

	// Structural plane ADC And add mesh
	face_vhandles.clear();
	face_vhandles.push_back(vhandle['A' - 65]);
	face_vhandles.push_back(vhandle['D' - 65]);
	face_vhandles.push_back(vhandle['C' - 65]);
	mesh.add_face(face_vhandles);

	// Structural plane ABE And add mesh
	face_vhandles.clear();
	face_vhandles.push_back(vhandle['A' - 65]);
	face_vhandles.push_back(vhandle['B' - 65]);
	face_vhandles.push_back(vhandle['E' - 65]);
	mesh.add_face(face_vhandles);

	// Structural plane BDE And add mesh
	face_vhandles.clear();
	face_vhandles.push_back(vhandle['B' - 65]);
	face_vhandles.push_back(vhandle['D' - 65]);
	face_vhandles.push_back(vhandle['E' - 65]);
	mesh.add_face(face_vhandles);

	// Structural plane DBC And add mesh
	face_vhandles.clear();
	face_vhandles.push_back(vhandle['D' - 65]);
	face_vhandles.push_back(vhandle['B' - 65]);
	face_vhandles.push_back(vhandle['C' - 65]);
	mesh.add_face(face_vhandles);


	return 0;
}