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# ----------------------------------------------------------------------------
# - Open3D: www.open3d.org -
# ----------------------------------------------------------------------------
# Copyright (c) 2018-2024 www.open3d.org
# SPDX-License-Identifier: MIT
# ----------------------------------------------------------------------------
import open3d as o3d
import numpy as np
import copy
if __name__ == "__main__":
knot_mesh = o3d.data.KnotMesh()
mesh = o3d.io.read_triangle_mesh(knot_mesh.path)
mesh.compute_vertex_normals()
print("Displaying original mesh ...")
o3d.visualization.draw([mesh])
print("Displaying mesh of only the first half triangles ...")
mesh_cropped = copy.deepcopy(mesh)
mesh_cropped.triangles = o3d.utility.Vector3iVector(
np.asarray(mesh_cropped.triangles)[:len(mesh_cropped.triangles) //
2, :])
mesh_cropped.triangle_normals = o3d.utility.Vector3dVector(
np.asarray(mesh_cropped.triangle_normals)
[:len(mesh_cropped.triangle_normals) // 2, :])
print(mesh_cropped.triangles)
o3d.visualization.draw([mesh_cropped])
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