Convert a mesh to a .ply file

mesh2ply.py

import argparse

import open3d as o3d

# Convert mesh file to .ply point clouds
if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='Process some integers.')
    parser.add_argument('--input_path', type=str, help='Path of the file to convert, output will be in the same dir if no output is given')
    parser.add_argument('--ouput_path', type=str, help='Path of where to save the file')
    parser.add_argument('--n_points', type=int, default=100_000, help='How many points the ply file should contain')
    parser.add_argument('--draw_output', type=bool, default=True, help='Should the resulting file be shown in plot')
    parser.add_argument('--write_ascii', type=bool, default=False, help='Whether to write the file as plain text file or in binary')
    args = parser.parse_args()

    print("Parsing file ... ")

    try:
        mesh = o3d.io.read_triangle_mesh(args.input_path)
    except Exception as e:
        print(f"Error: expected input to a triangle mesh: {e}")

    pcd = mesh.sample_points_uniformly(args.n_points)

    if args.draw_output:
        o3d.visualization.draw_geometries([mesh]) # Draw input
        o3d.visualization.draw_geometries([pcd])  # Draw output

    file_out = args.ouput_path or args.input_path.replace(".ply", f"_downsampled_{args.n_points}.ply")
    o3d.io.write_point_cloud(
        file_out, 
        pcd, 
        format = "auto", 
        write_ascii = args.write_ascii, 
        compressed = False, 
        print_progress = True
    )