如何用OpenMesh创建一个四棱锥

Posted 2022-07-01 CSU迦叶

自己凭空构造一个如图所示的四棱锥，基本信息是[V, E, F] = [5, 9, 6]

各个点的坐标是A(0,0,1)  B(-1,1,0)  C(1,1,0)  D(1,-1,0)  E(-1,-1,0)

确定面片添加顺序是AED->ACB->ADC->ABE->BDE->DBC

注意：每个面的点加入的顺序应为相对于该面片朝外的法向量是逆时针分布

// IoTestPro.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//

#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;//预计是一个四棱锥
	TriMesh::VertexHandle vhandle[5];//点的句柄数组
	std::vector<TriMesh::VertexHandle> face_vhandles;//一个面中含有多个点

	vhandle[0] = mesh.add_vertex(TriMesh::Point(0, 0, 2));//点A
	vhandle[1] = mesh.add_vertex(TriMesh::Point(-1, 1, 0));//点B
	vhandle[2] = mesh.add_vertex(TriMesh::Point(1, 1, 0));//点C
	vhandle[3] = mesh.add_vertex(TriMesh::Point(1, -1, 0));//点D
	vhandle[4] = mesh.add_vertex(TriMesh::Point(-1, -1, 0));//点E
    
	//构造面AED并加入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);

	//构造面ACB并加入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);

	//构造面ADC并加入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);

	//构造面ABE并加入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);

	//构造面BDE并加入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);

	//构造面DBC并加入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;