OpenMesh 删除网格顶点

时间:2021-12-04 10:49:47

OpenMesh 提供了 delete_vertex() 函数来实现从网格中删除顶点,在删除掉顶点的同时,所有与该顶点相连的边也同时被删除。

OpenMesh 官方文档 中给的顶点删除函数声明如下:

void OpenMesh::PolyConnectivity::delete_vertex(VertexHandle _vh, bool _delete_isolated_vertices = true)

Mark vertex and all incident edges and faces deleted.

Items marked deleted will be removed by garbageCollection().

Attention: Needs the Attributes::Status attribute for vertices, edges and faces.

需要注意的是,在删除几何元素前,需要获取网格顶点、边和面的状态属性,并在删除结束后释放。所有正确的删除网格顶点的代码如下:

MyMesh mesh;
vector<MyMesh::VertexHandle> delete_vh; //删除顶点的集合
if (!mesh.has_vertex_status()) mesh.request_vertex_status();
if (!mesh.has_face_status()) mesh.request_face_status();
if (!mesh.has_edge_status()) mesh.request_edge_status(); for (auto vit=mesh.vertices_begin(); vit!=mesh.vertices_end(); vit++)
{
if (find(delete_vh.begin(), delete_vh.end(), vit.handle()) ==delete_vh.end())
{
mesh.delete_vertex(vit.handle(), true);
}
}
mesh.garbage_collection(); if (mesh.has_vertex_status()) mesh.release_vertex_status();
if (mesh.has_face_status()) mesh.release_face_status();
if (mesh.has_edge_status()) mesh.release_edge_status();