点云体积计算

Cloudcompare体积计算
疑问：为什么同一个物体, XYZ方向计算出来的体积不一样呢

alphashape表面重建

import open3d as o3d
import numpy as nppcd = o3d.io.read_point_cloud("test.pcd")
alpha = 2
print(f"alpha={alpha:.3f}")
mesh1 = o3d.geometry.TriangleMesh.create_from_point_cloud_alpha_shape(pcd, alpha)  # 执行单一alpah阈值
mesh1.compute_vertex_normals()  # 计算mesh的法线
# o3d.visualization.draw_geometries([mesh1], 
#                                   width=800, height=800,
#                                   mesh_show_back_face=True)mesh1.compute_vertex_normals()
mesh1.paint_uniform_color([1, 0.7, 0])
# area = mesh.get_surface_area() 
volume1 = mesh1.get_volume()     
# print("表面积为：", area)
print("体积为：", volume1)

凸包体积计算

import numpy as np
from scipy.spatial import ConvexHull
import open3d as o3ddef convex_hull_volume(points):hull = ConvexHull(points) return hull.volume  # 读取点云数据
pcd = o3d.io.read_point_cloud("test.pcd")
pcd = pcd.voxel_down_sample(voxel_size=0.1)
points = np.asarray(pcd.points)
volume = convex_hull_volume(points)
print(f"点云体积（凸包）: {volume}")