What is the intuition to choose radius = 0.7?

[sheshap]

Dear @hehefan

Can you please help us understand the reason to choose radius = 0.7?

Each frame in the input point cloud has 2048 points.
A radius of 0.7 gives access to a lot of points leading to randomness while picking points using ball-querying.

Shouldn't the ball-query radius be smaller to effectively capture local neighborhood points? (rather than picking points from all over a major portion of the point cloud frame).

Visualization (green points are input frame points, red point is an anchor point and blue points are ball queried points).

Thanks in Advance.