The existing algorithm for convex hull is not able to capture the feature for a set of 3D points. Moreover, I found few mathematic tools have this function to obtain the concave hull and their responding points.
Given the data of spheres:
x1 y1 z1 radii_1
x2 y2 z2 radii_2
xn yn zn radii_n
I found a 2D algorithm, it works fine depending on the threshold value. However, I need the 3D algorithm.