computation error in C2C distance

[zhuhaixiong]

I generate two point cloud by matlab,the have the same x and y coordinate,the z mean of first cloud is 0,the second z mean is 10mm,when I use the c2c method to compute the distance,this error occurs;but when i turn down the z mean to 6mm and keep x,y still,it can compute the disance;the point number of two cloud are both 160800;how to deal with this problem

[daniel]

Which error occurs exactly? Can you share your point clouds with us maybe?