generalizedICP get nan value.

[songhc8]

Checklist

• [X] I have searched for similar issues.
• [X] For Python issues, I have tested with the latest development wheel.
• [X] I have checked the release documentation and the latest documentation (for main branch).

My Question

我使用 pcl 库计算法线，然后将 pcl 点云转换为 open3d 点云。 我使用 generalizedICP 计算两个点云之间的变换，结果是 nan 值。 请问有哪些可能的原因会导致计算结果为nan。