[英]Python - plotting surface around 3D plot cloud
我运行计算流体动力学模拟，我想在数量优于阈值的区域细化我的网格。 我设法提取点位置，因此我获得了一个点列表，描述了符合我的优化标准的区域。
为了细化我的网格，我需要向软件提供由点云描述的曲面（或曲线，如果我们在 2D 中）的外部边界。 更具体地说，我需要删除区域中心的所有点以获得边界上的坐标。 然后我想用曲线包围这些点。
我在论坛上找到了类似的帖子，但问题是插入点云，所以不是我想要的： Fit Curve-Spline to 3D Point Cloud
你能帮我做吗？
这是点云的二维示例，我只想保留边界点并绘制周围曲线：
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1.6129,0.1881,0
1.6534,0.1881,0
1.6944,0.1881,0
1.7357,0.1881,0
1.7774,0.1881,0
1.8196,0.1881,0
1.8622,0.1881,0
1.9052,0.1881,0
1.9487,0.1881,0
1.9926,0.1881,0
2.0369,0.1881,0
谢谢你的帮助，
真挚地
可以使用 SciPy 中的ConvexHull ，此函数与convex_hull_plot_2d一起为提供的数据集生成此结果。 下面是重现图片的代码。 代码末尾的hull.points包含您正在寻找的结果轮廓点集。
import matplotlib.pyplot as plt
import pandas as pd
import numpy as np
from scipy.spatial import ConvexHull, convex_hull_plot_2d
df = pd.DataFrame([{'x': 0.20215, 'y': 0.29703, 'z': 0},
{'x': 0.22857, 'y': 0.29703, 'z': 0},
{'x': 0.25526, 'y': 0.29703, 'z': 0},
{'x': 0.28221, 'y': 0.29703, 'z': 0},
{'x': 0.30943, 'y': 0.29703, 'z': 0},
{'x': 0.33692, 'y': 0.29703, 'z': 0},
{'x': 0.36469, 'y': 0.29703, 'z': 0},
{'x': 0.39273, 'y': 0.29703, 'z': 0},
{'x': 0.42106, 'y': 0.29703, 'z': 0},
{'x': 0.44966, 'y': 0.29703, 'z': 0},
{'x': 0.47856, 'y': 0.29703, 'z': 0},
{'x': 0.50774, 'y': 0.29703, 'z': 0},
{'x': 0.53722, 'y': 0.29703, 'z': 0},
{'x': 0.56699, 'y': 0.29703, 'z': 0},
{'x': 0.59706, 'y': 0.29703, 'z': 0},
{'x': 0.62742, 'y': 0.29703, 'z': 0},
{'x': 0.6581, 'y': 0.29703, 'z': 0},
{'x': 0.68907, 'y': 0.29703, 'z': 0},
{'x': 0.72036, 'y': 0.29703, 'z': 0},
{'x': 0.75196, 'y': 0.29703, 'z': 0},
{'x': 0.78388, 'y': 0.29703, 'z': 0},
{'x': 0.81612, 'y': 0.29703, 'z': 0},
{'x': 0.84868, 'y': 0.29703, 'z': 0},
{'x': 0.88156, 'y': 0.29703, 'z': 0},
{'x': 0.91478, 'y': 0.29703, 'z': 0},
{'x': 0.94832, 'y': 0.29703, 'z': 0},
{'x': 0.9822, 'y': 0.29703, 'z': 0},
{'x': 1.0164, 'y': 0.29703, 'z': 0},
{'x': 1.051, 'y': 0.29703, 'z': 0},
{'x': 1.0859, 'y': 0.29703, 'z': 0},
{'x': 1.1211, 'y': 0.29703, 'z': 0},
{'x': 1.1568, 'y': 0.29703, 'z': 0},
{'x': 1.1927, 'y': 0.29703, 'z': 0},
{'x': 1.229, 'y': 0.29703, 'z': 0},
{'x': 1.2657, 'y': 0.29703, 'z': 0},
{'x': 1.3028, 'y': 0.29703, 'z': 0},
{'x': 1.3402, 'y': 0.29703, 'z': 0},
{'x': 1.378, 'y': 0.29703, 'z': 0},
{'x': 1.4162, 'y': 0.29703, 'z': 0},
{'x': 1.4548, 'y': 0.29703, 'z': 0},
{'x': 1.4937, 'y': 0.29703, 'z': 0},
{'x': 1.533, 'y': 0.29703, 'z': 0},
{'x': 1.5728, 'y': 0.29703, 'z': 0},
{'x': 1.6129, 'y': 0.29703, 'z': 0},
{'x': 1.6534, 'y': 0.29703, 'z': 0},
{'x': 1.6944, 'y': 0.29703, 'z': 0},
{'x': 1.7357, 'y': 0.29703, 'z': 0},
{'x': 1.7774, 'y': 0.29703, 'z': 0},
{'x': 1.8196, 'y': 0.29703, 'z': 0},
{'x': 1.8622, 'y': 0.29703, 'z': 0},
{'x': 1.9052, 'y': 0.29703, 'z': 0},
{'x': 1.9487, 'y': 0.29703, 'z': 0},
{'x': 1.9926, 'y': 0.29703, 'z': 0},
{'x': 2.0369, 'y': 0.29703, 'z': 0},
{'x': 2.0817, 'y': 0.29703, 'z': 0},
{'x': 2.1269, 'y': 0.29703, 'z': 0},
{'x': 2.1725, 'y': 0.29703, 'z': 0},
{'x': 2.2187, 'y': 0.29703, 'z': 0},
{'x': 2.2652, 'y': 0.29703, 'z': 0},
{'x': 2.3123, 'y': 0.29703, 'z': 0},
{'x': 2.3598, 'y': 0.29703, 'z': 0},
{'x': 2.4078, 'y': 0.29703, 'z': 0},
{'x': 2.4563, 'y': 0.29703, 'z': 0},
{'x': 2.5053, 'y': 0.29703, 'z': 0},
{'x': 2.5547, 'y': 0.29703, 'z': 0},
{'x': 2.6046, 'y': 0.29703, 'z': 0},
{'x': 2.6551, 'y': 0.29703, 'z': 0},
{'x': 2.706, 'y': 0.29703, 'z': 0},
{'x': 2.7575, 'y': 0.29703, 'z': 0},
{'x': 2.8095, 'y': 0.29703, 'z': 0},
{'x': 2.862, 'y': 0.29703, 'z': 0},
{'x': 2.915, 'y': 0.29703, 'z': 0},
{'x': 2.9685, 'y': 0.29703, 'z': 0},
{'x': 3.0226, 'y': 0.29703, 'z': 0},
{'x': 3.0772, 'y': 0.29703, 'z': 0},
{'x': 3.1324, 'y': 0.29703, 'z': 0},
{'x': 3.1881, 'y': 0.29703, 'z': 0},
{'x': 3.2444, 'y': 0.29703, 'z': 0},
{'x': 3.3013, 'y': 0.29703, 'z': 0},
{'x': 3.3587, 'y': 0.29703, 'z': 0},
{'x': 3.4166, 'y': 0.29703, 'z': 0},
{'x': 3.4752, 'y': 0.29703, 'z': 0},
{'x': 3.5344, 'y': 0.29703, 'z': 0},
{'x': 3.5941, 'y': 0.29703, 'z': 0},
{'x': 3.6544, 'y': 0.29703, 'z': 0},
{'x': 3.7154, 'y': 0.29703, 'z': 0},
{'x': 3.7769, 'y': 0.29703, 'z': 0},
{'x': 3.8391, 'y': 0.29703, 'z': 0},
{'x': 3.9019, 'y': 0.29703, 'z': 0},
{'x': 3.9653, 'y': 0.29703, 'z': 0},
{'x': 4.0294, 'y': 0.29703, 'z': 0},
{'x': 4.094, 'y': 0.29703, 'z': 0},
{'x': 4.1594, 'y': 0.29703, 'z': 0},
{'x': 4.2254, 'y': 0.29703, 'z': 0},
{'x': 4.292, 'y': 0.29703, 'z': 0},
{'x': 4.3593, 'y': 0.29703, 'z': 0},
{'x': 4.4273, 'y': 0.29703, 'z': 0},
{'x': 4.496, 'y': 0.29703, 'z': 0},
{'x': 4.5654, 'y': 0.29703, 'z': 0},
{'x': 4.6354, 'y': 0.29703, 'z': 0},
{'x': 4.7062, 'y': 0.29703, 'z': 0},
{'x': 4.7776, 'y': 0.29703, 'z': 0},
{'x': 4.8498, 'y': 0.29703, 'z': 0},
{'x': 4.9227, 'y': 0.29703, 'z': 0},
{'x': 0.28221, 'y': 0.28425, 'z': 0},
{'x': 0.30943, 'y': 0.28425, 'z': 0},
{'x': 0.33692, 'y': 0.28425, 'z': 0},
{'x': 0.36469, 'y': 0.28425, 'z': 0},
{'x': 0.39273, 'y': 0.28425, 'z': 0},
{'x': 0.42106, 'y': 0.28425, 'z': 0},
{'x': 0.44966, 'y': 0.28425, 'z': 0},
{'x': 0.47856, 'y': 0.28425, 'z': 0},
{'x': 0.50774, 'y': 0.28425, 'z': 0},
{'x': 0.53722, 'y': 0.28425, 'z': 0},
{'x': 0.56699, 'y': 0.28425, 'z': 0},
{'x': 0.59706, 'y': 0.28425, 'z': 0},
{'x': 0.62742, 'y': 0.28425, 'z': 0},
{'x': 0.6581, 'y': 0.28425, 'z': 0},
{'x': 0.68907, 'y': 0.28425, 'z': 0},
{'x': 0.72036, 'y': 0.28425, 'z': 0},
{'x': 0.75196, 'y': 0.28425, 'z': 0},
{'x': 0.78388, 'y': 0.28425, 'z': 0},
{'x': 0.81612, 'y': 0.28425, 'z': 0},
{'x': 0.84868, 'y': 0.28425, 'z': 0},
{'x': 0.88156, 'y': 0.28425, 'z': 0},
{'x': 0.91478, 'y': 0.28425, 'z': 0},
{'x': 0.94832, 'y': 0.28425, 'z': 0},
{'x': 0.9822, 'y': 0.28425, 'z': 0},
{'x': 1.0164, 'y': 0.28425, 'z': 0},
{'x': 1.051, 'y': 0.28425, 'z': 0},
{'x': 1.0859, 'y': 0.28425, 'z': 0},
{'x': 1.1211, 'y': 0.28425, 'z': 0},
{'x': 1.1568, 'y': 0.28425, 'z': 0},
{'x': 1.1927, 'y': 0.28425, 'z': 0},
{'x': 1.229, 'y': 0.28425, 'z': 0},
{'x': 1.2657, 'y': 0.28425, 'z': 0},
{'x': 1.3028, 'y': 0.28425, 'z': 0},
{'x': 1.3402, 'y': 0.28425, 'z': 0},
{'x': 1.378, 'y': 0.28425, 'z': 0},
{'x': 1.4162, 'y': 0.28425, 'z': 0},
{'x': 1.4548, 'y': 0.28425, 'z': 0},
{'x': 1.4937, 'y': 0.28425, 'z': 0},
{'x': 1.533, 'y': 0.28425, 'z': 0},
{'x': 1.5728, 'y': 0.28425, 'z': 0},
{'x': 1.6129, 'y': 0.28425, 'z': 0},
{'x': 1.6534, 'y': 0.28425, 'z': 0},
{'x': 1.6944, 'y': 0.28425, 'z': 0},
{'x': 1.7357, 'y': 0.28425, 'z': 0},
{'x': 1.7774, 'y': 0.28425, 'z': 0},
{'x': 1.8196, 'y': 0.28425, 'z': 0},
{'x': 1.8622, 'y': 0.28425, 'z': 0},
{'x': 1.9052, 'y': 0.28425, 'z': 0},
{'x': 1.9487, 'y': 0.28425, 'z': 0},
{'x': 1.9926, 'y': 0.28425, 'z': 0},
{'x': 2.0369, 'y': 0.28425, 'z': 0},
{'x': 2.0817, 'y': 0.28425, 'z': 0},
{'x': 2.1269, 'y': 0.28425, 'z': 0},
{'x': 2.1725, 'y': 0.28425, 'z': 0},
{'x': 2.2187, 'y': 0.28425, 'z': 0},
{'x': 2.2652, 'y': 0.28425, 'z': 0},
{'x': 2.3123, 'y': 0.28425, 'z': 0},
{'x': 2.3598, 'y': 0.28425, 'z': 0},
{'x': 2.4078, 'y': 0.28425, 'z': 0},
{'x': 2.4563, 'y': 0.28425, 'z': 0},
{'x': 2.5053, 'y': 0.28425, 'z': 0},
{'x': 2.5547, 'y': 0.28425, 'z': 0},
{'x': 2.6046, 'y': 0.28425, 'z': 0},
{'x': 2.6551, 'y': 0.28425, 'z': 0},
{'x': 2.706, 'y': 0.28425, 'z': 0},
{'x': 2.7575, 'y': 0.28425, 'z': 0},
{'x': 2.8095, 'y': 0.28425, 'z': 0},
{'x': 2.862, 'y': 0.28425, 'z': 0},
{'x': 2.915, 'y': 0.28425, 'z': 0},
{'x': 2.9685, 'y': 0.28425, 'z': 0},
{'x': 3.0226, 'y': 0.28425, 'z': 0},
{'x': 3.0772, 'y': 0.28425, 'z': 0},
{'x': 3.1324, 'y': 0.28425, 'z': 0},
{'x': 3.1881, 'y': 0.28425, 'z': 0},
{'x': 3.2444, 'y': 0.28425, 'z': 0},
{'x': 3.3013, 'y': 0.28425, 'z': 0},
{'x': 3.3587, 'y': 0.28425, 'z': 0},
{'x': 3.4166, 'y': 0.28425, 'z': 0},
{'x': 3.4752, 'y': 0.28425, 'z': 0},
{'x': 3.5344, 'y': 0.28425, 'z': 0},
{'x': 3.5941, 'y': 0.28425, 'z': 0},
{'x': 3.6544, 'y': 0.28425, 'z': 0},
{'x': 3.7154, 'y': 0.28425, 'z': 0},
{'x': 3.7769, 'y': 0.28425, 'z': 0},
{'x': 3.8391, 'y': 0.28425, 'z': 0},
{'x': 3.9019, 'y': 0.28425, 'z': 0},
{'x': 3.9653, 'y': 0.28425, 'z': 0},
{'x': 4.0294, 'y': 0.28425, 'z': 0},
{'x': 4.094, 'y': 0.28425, 'z': 0},
{'x': 4.1594, 'y': 0.28425, 'z': 0},
{'x': 4.2254, 'y': 0.28425, 'z': 0},
{'x': 4.292, 'y': 0.28425, 'z': 0},
{'x': 4.3593, 'y': 0.28425, 'z': 0},
{'x': 4.4273, 'y': 0.28425, 'z': 0},
{'x': 4.496, 'y': 0.28425, 'z': 0},
{'x': 4.5654, 'y': 0.28425, 'z': 0},
{'x': 0.39273, 'y': 0.27117, 'z': 0},
{'x': 0.42106, 'y': 0.27117, 'z': 0},
{'x': 0.44966, 'y': 0.27117, 'z': 0},
{'x': 0.47856, 'y': 0.27117, 'z': 0},
{'x': 0.50774, 'y': 0.27117, 'z': 0},
{'x': 0.53722, 'y': 0.27117, 'z': 0},
{'x': 0.56699, 'y': 0.27117, 'z': 0},
{'x': 0.59706, 'y': 0.27117, 'z': 0},
{'x': 0.62742, 'y': 0.27117, 'z': 0},
{'x': 0.6581, 'y': 0.27117, 'z': 0},
{'x': 0.68907, 'y': 0.27117, 'z': 0},
{'x': 0.72036, 'y': 0.27117, 'z': 0},
{'x': 0.75196, 'y': 0.27117, 'z': 0},
{'x': 0.78388, 'y': 0.27117, 'z': 0},
{'x': 0.81612, 'y': 0.27117, 'z': 0},
{'x': 0.84868, 'y': 0.27117, 'z': 0},
{'x': 0.88156, 'y': 0.27117, 'z': 0},
{'x': 0.91478, 'y': 0.27117, 'z': 0},
{'x': 0.94832, 'y': 0.27117, 'z': 0},
{'x': 0.9822, 'y': 0.27117, 'z': 0},
{'x': 1.0164, 'y': 0.27117, 'z': 0},
{'x': 1.051, 'y': 0.27117, 'z': 0},
{'x': 1.0859, 'y': 0.27117, 'z': 0},
{'x': 1.1211, 'y': 0.27117, 'z': 0},
{'x': 1.1568, 'y': 0.27117, 'z': 0},
{'x': 1.1927, 'y': 0.27117, 'z': 0},
{'x': 1.229, 'y': 0.27117, 'z': 0},
{'x': 1.2657, 'y': 0.27117, 'z': 0},
{'x': 1.3028, 'y': 0.27117, 'z': 0},
{'x': 1.3402, 'y': 0.27117, 'z': 0},
{'x': 1.378, 'y': 0.27117, 'z': 0},
{'x': 1.4162, 'y': 0.27117, 'z': 0},
{'x': 1.4548, 'y': 0.27117, 'z': 0},
{'x': 1.4937, 'y': 0.27117, 'z': 0},
{'x': 1.533, 'y': 0.27117, 'z': 0},
{'x': 1.5728, 'y': 0.27117, 'z': 0},
{'x': 1.6129, 'y': 0.27117, 'z': 0},
{'x': 1.6534, 'y': 0.27117, 'z': 0},
{'x': 1.6944, 'y': 0.27117, 'z': 0},
{'x': 1.7357, 'y': 0.27117, 'z': 0},
{'x': 1.7774, 'y': 0.27117, 'z': 0},
{'x': 1.8196, 'y': 0.27117, 'z': 0},
{'x': 1.8622, 'y': 0.27117, 'z': 0},
{'x': 1.9052, 'y': 0.27117, 'z': 0},
{'x': 1.9487, 'y': 0.27117, 'z': 0},
{'x': 1.9926, 'y': 0.27117, 'z': 0},
{'x': 2.0369, 'y': 0.27117, 'z': 0},
{'x': 2.0817, 'y': 0.27117, 'z': 0},
{'x': 2.1269, 'y': 0.27117, 'z': 0},
{'x': 2.1725, 'y': 0.27117, 'z': 0},
{'x': 2.2187, 'y': 0.27117, 'z': 0},
{'x': 2.2652, 'y': 0.27117, 'z': 0},
{'x': 2.3123, 'y': 0.27117, 'z': 0},
{'x': 2.3598, 'y': 0.27117, 'z': 0},
{'x': 2.4078, 'y': 0.27117, 'z': 0},
{'x': 2.4563, 'y': 0.27117, 'z': 0},
{'x': 2.5053, 'y': 0.27117, 'z': 0},
{'x': 2.5547, 'y': 0.27117, 'z': 0},
{'x': 2.6046, 'y': 0.27117, 'z': 0},
{'x': 2.6551, 'y': 0.27117, 'z': 0},
{'x': 2.706, 'y': 0.27117, 'z': 0},
{'x': 2.7575, 'y': 0.27117, 'z': 0},
{'x': 2.8095, 'y': 0.27117, 'z': 0},
{'x': 2.862, 'y': 0.27117, 'z': 0},
{'x': 2.915, 'y': 0.27117, 'z': 0},
{'x': 2.9685, 'y': 0.27117, 'z': 0},
{'x': 3.0226, 'y': 0.27117, 'z': 0},
{'x': 3.0772, 'y': 0.27117, 'z': 0},
{'x': 3.1324, 'y': 0.27117, 'z': 0},
{'x': 3.1881, 'y': 0.27117, 'z': 0},
{'x': 3.2444, 'y': 0.27117, 'z': 0},
{'x': 3.3013, 'y': 0.27117, 'z': 0},
{'x': 3.3587, 'y': 0.27117, 'z': 0},
{'x': 3.4166, 'y': 0.27117, 'z': 0},
{'x': 3.4752, 'y': 0.27117, 'z': 0},
{'x': 3.5344, 'y': 0.27117, 'z': 0},
{'x': 3.5941, 'y': 0.27117, 'z': 0},
{'x': 3.6544, 'y': 0.27117, 'z': 0},
{'x': 3.7154, 'y': 0.27117, 'z': 0},
{'x': 3.7769, 'y': 0.27117, 'z': 0},
{'x': 3.8391, 'y': 0.27117, 'z': 0},
{'x': 3.9019, 'y': 0.27117, 'z': 0},
{'x': 3.9653, 'y': 0.27117, 'z': 0},
{'x': 4.0294, 'y': 0.27117, 'z': 0},
{'x': 4.094, 'y': 0.27117, 'z': 0},
{'x': 4.1594, 'y': 0.27117, 'z': 0},
{'x': 0.47856, 'y': 0.25781, 'z': 0},
{'x': 0.50774, 'y': 0.25781, 'z': 0},
{'x': 0.53722, 'y': 0.25781, 'z': 0},
{'x': 0.56699, 'y': 0.25781, 'z': 0},
{'x': 0.59706, 'y': 0.25781, 'z': 0},
{'x': 0.62742, 'y': 0.25781, 'z': 0},
{'x': 0.6581, 'y': 0.25781, 'z': 0},
{'x': 0.68907, 'y': 0.25781, 'z': 0},
{'x': 0.72036, 'y': 0.25781, 'z': 0},
{'x': 0.75196, 'y': 0.25781, 'z': 0},
{'x': 0.78388, 'y': 0.25781, 'z': 0},
{'x': 0.81612, 'y': 0.25781, 'z': 0},
{'x': 0.84868, 'y': 0.25781, 'z': 0},
{'x': 0.88156, 'y': 0.25781, 'z': 0},
{'x': 0.91478, 'y': 0.25781, 'z': 0},
{'x': 0.94832, 'y': 0.25781, 'z': 0},
{'x': 0.9822, 'y': 0.25781, 'z': 0},
{'x': 1.0164, 'y': 0.25781, 'z': 0},
{'x': 1.051, 'y': 0.25781, 'z': 0},
{'x': 1.0859, 'y': 0.25781, 'z': 0},
{'x': 1.1211, 'y': 0.25781, 'z': 0},
{'x': 1.1568, 'y': 0.25781, 'z': 0},
{'x': 1.1927, 'y': 0.25781, 'z': 0},
{'x': 1.229, 'y': 0.25781, 'z': 0},
{'x': 1.2657, 'y': 0.25781, 'z': 0},
{'x': 1.3028, 'y': 0.25781, 'z': 0},
{'x': 1.3402, 'y': 0.25781, 'z': 0},
{'x': 1.378, 'y': 0.25781, 'z': 0},
{'x': 1.4162, 'y': 0.25781, 'z': 0},
{'x': 1.4548, 'y': 0.25781, 'z': 0},
{'x': 1.4937, 'y': 0.25781, 'z': 0},
{'x': 1.533, 'y': 0.25781, 'z': 0},
{'x': 1.5728, 'y': 0.25781, 'z': 0},
{'x': 1.6129, 'y': 0.25781, 'z': 0},
{'x': 1.6534, 'y': 0.25781, 'z': 0},
{'x': 1.6944, 'y': 0.25781, 'z': 0},
{'x': 1.7357, 'y': 0.25781, 'z': 0},
{'x': 1.7774, 'y': 0.25781, 'z': 0},
{'x': 1.8196, 'y': 0.25781, 'z': 0},
{'x': 1.8622, 'y': 0.25781, 'z': 0},
{'x': 1.9052, 'y': 0.25781, 'z': 0},
{'x': 1.9487, 'y': 0.25781, 'z': 0},
{'x': 1.9926, 'y': 0.25781, 'z': 0},
{'x': 2.0369, 'y': 0.25781, 'z': 0},
{'x': 2.0817, 'y': 0.25781, 'z': 0},
{'x': 2.1269, 'y': 0.25781, 'z': 0},
{'x': 2.1725, 'y': 0.25781, 'z': 0},
{'x': 2.2187, 'y': 0.25781, 'z': 0},
{'x': 2.2652, 'y': 0.25781, 'z': 0},
{'x': 2.3123, 'y': 0.25781, 'z': 0},
{'x': 2.3598, 'y': 0.25781, 'z': 0},
{'x': 2.4078, 'y': 0.25781, 'z': 0},
{'x': 2.4563, 'y': 0.25781, 'z': 0},
{'x': 2.5053, 'y': 0.25781, 'z': 0},
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{'x': 2.6046, 'y': 0.25781, 'z': 0},
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{'x': 1.7774, 'y': 0.1881, 'z': 0},
{'x': 1.8196, 'y': 0.1881, 'z': 0},
{'x': 1.8622, 'y': 0.1881, 'z': 0},
{'x': 1.9052, 'y': 0.1881, 'z': 0},
{'x': 1.9487, 'y': 0.1881, 'z': 0},
{'x': 1.9926, 'y': 0.1881, 'z': 0},
{'x': 2.0369, 'y': 0.1881, 'z': 0}])
plt.scatter(data=df, x='x', y='y', label='original_data')
plt.legend()
plt.title('original data')
plt.show()
hull = ConvexHull(df[['x', 'y']])
fig = plt.figure()
ax = fig.add_subplot(1,1,1)
convex_hull_plot_2d(hull, ax=ax)
fig.tight_layout()
plt.title('convex hull with points')
plt.show()
hull.points
array([[0.20215, 0.29703],
[0.22857, 0.29703],
[0.25526, 0.29703],
...,
[1.9487 , 0.1881 ],
[1.9926 , 0.1881 ],
[2.0369 , 0.1881 ]])
凸包是一种很好的方法，尽管它不能解决您所展示的情况（具有内部边界的甜甜圈形状）。
我认为您需要的算法称为“Marching cubes”（或 Marching squares，2D）。 这是一种广泛使用的方法，因此您应该能够轻松地在 python 中找到一些实现它的库。
https://en.wikipedia.org/wiki/Marching_squares
基本上，考虑到 2D 情况，该算法的工作原理如下：
在 3D 中，想法是相同的，但使用立方体而不是正方形，并且预定义的案例数量更多。
当形状有孔时，其他人提到的凸包方法不起作用（如您的环面示例）。
您要解决的问题称为表面重建。 最终的网格不会有你想要的内部点。
Open3D 为此实现了一些算法，您可以在 Python 中对数据进行处理。
将您的 numpy 点云转换为 Open3D 的使用
pcd = o3d.geometry.PointCloud()
pcd.points = o3d.utility.Vector3dVector(xyz)
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