How to add a list of coordinate to open3d

[assia855]

I have a list of coordinate:
[[(0.0, 0.0), (1.0, 2.0), (14.0, 14.0)], [(0.0, 1.0), (3.0, 2.0), (38.0, 37.0)], [(0.0, 1.0), (3.0, 4.0), (38.0, 38.0)], [(0.0, 0.0), (23.0, 24.0), (10.0, 10.0)], [(0.0, 0.0), (24.0, 25.0), (10.0, 10.0)], [(0.0, 0.0), (25.0, 26.0), (10.0, 10.0)], [(0.0, 0.0), (26.0, 27.0), (10.0, 10.0)]]

When I convert it to open3d using:

pcd = o3d.geometry.PointCloud()
pcd.points = o3d.utility.Vector3dVector(position)

I have this error:
RuntimeError: Unable to cast Python instance to C++ type (compile in debug mode for details)
please how can I solve this error?
Thanks in advance.

[reptinias]

Hello there.

The reason you get the error is because you use a python list as an argument to the Vector3dVector.
Converting the list to a numpy array would solve this error.

However when I run the script after conversion, you would get another error, which is due to the structure of the list.
If you restructured the list to look like this:

You would not get the error.

I have tried to write some code, as example to how you could use the Vector3dVector

`
import open3d as o3d
import numpy as np

array = np.random.random_sample(size = (15,3))

print(array)
position = array.tolist()

listToNp = np.asarray(position)

pcd = o3d.geometry.PointCloud()
pcd.points = o3d.utility.Vector3dVector(listToNp)

o3d.visualization.draw_geometries([pcd])
`

This would result in the output point cloud below:

Hope this helps you!

[assia855]

Thank you so much for your replay. Actually my matrix is in shape (4089, 3, 2) and it is already in list. Even while using your code I still have the same problem. Any other idea to make it work. Thanks in advance.

[reptinias]

When looking at the documentation the Vector3dVector, take a (n, 3) numpy array. So i unfortunatly don't think it is possible to use that matrix.
However if you take forexample the first row [(0.0, 0.0), (1.0, 2.0), (14.0. 14.0)] and turn that into [0, 1, 14] it would work. This has to be done for all rows in the matrix.
Documentation

[assia855]

I'm trying to visualize a graph and this matrix contain the coordinate of the edges, so I can't seem to change it. I already tried to reshape the matrix from (4089, 3, 2) to (4089, 3) but the output wasn't the same that I 'm expecting.

[reptinias]

I'm sorry but I'm not sure how to do this.
My best bet would be to run the matrix through a for loop and add the points one by one to the point cloud.
I'm sorry that i can't help more than that

[assia855]

Thanks alot