Python(Open3d)，How to remove points from .ply

To remove points from a .ply file using Python and the Open3D library, you can follow these steps:

1. Import the necessary libraries:

import open3d as o3d

1. Read the .ply file:

point_cloud = o3d.io.read_point_cloud("input_file.ply")

1. Create a boolean mask to identify the points that need to be removed. For example, you can define a condition to remove points based on their coordinates:

remove_mask = (point_cloud.points[:, 2] < 0)  # Remove points with negative Z-coordinates

In this example, all points with a negative Z-coordinate will be removed.

1. Use the mask to filter out the points from the point cloud:

filtered_point_cloud = point_cloud.select_by_index(np.where(~remove_mask)[0])

1. Save the resulting point cloud to a new .ply file:

o3d.io.write_point_cloud("output_file.ply", filtered_point_cloud)

By following these steps, the points that meet the defined condition will be removed from the .ply file.

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