在Open3D中,open3d.geometry.VoxelGrid类实例提供了to_octree方法,它的作用是将VoxelGrid转换为一个Octree。Octree数据结构是一种树形结构,它可以被用来存储三维数据,比如点云或者体素网格。Octree的一个主要应用就是能够高效的在点云或者体素网格上进行搜索或者遍历。
to_octree(depth, full_depth, min_occlusion_ratio)
返回的类型是Open3D的Octree类实例。
import open3d as o3d
# 创建一个VoxelGrid实例
voxel_grid = o3d.geometry.VoxelGrid.create_from_point_cloud_random_sampling(
o3d.geometry.TriangleMesh.create_box(),
voxel_size=0.05)
# 将VoxelGrid转换为Octree
octree = voxel_grid.to_octree(depth=7, full_depth=8, min_occlusion_ratio=0.001)
# 输出Octree的深度和体积大小
print("Octree depth:", octree.depth, "Octree volume size:", octree.volume_size)
# 可视化Octree
o3d.visualization.draw_geometries([octree])