the use of the normals_packed()

[noviceor]

In this way, it turns out that normal is None. I check the api and find there's a return value of estimate_nomals(). I'd like to know how to ues normals_packed() after 'estimate'.

[bottler]

If you want to use normals_packed() to return the value calculated by a previous estimate_nomals(), you just need to set assign_to_self=True in that call to estimate_nomals(). If you don't set that, then estimate_nomals acts as a pure function.

See https://github.com/facebookresearch/pytorch3d/blob/main/pytorch3d/structures/pointclouds.py#L1044