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import numpy as np from open3d import * downpcd = read_point_cloud("test.pcd") #downpcd = downpcd.normals draw_geometries([downpcd]) estimate_normals(downpcd, search_param = KDTreeSearchParamHybrid(radius = 1.0, max_nn = 5)) draw_geometries([downpcd]) also the result is a bool ...