Options for convhulln function

Hello everyone,

I am trying to use the convhulln function to generate a convex hull around a set of 3D points and I was wondering if there are options to manipulate how tight the convex hull fits around the points.

The boundary function for example lets you set a shrink factor from 0 to 1, where 0 gives you a convex hull. Is there a similar option for the convhulln function? Both the Mathworks documentary and qhull.org did not help me in finding this option, if it even exists.

Thanks for your help!