I know some of you are much better at math than I am, so I need some help.

I have the need for a concave hull algorithm for work, but I am struggling with some of the math for it. I am able to get a convex hull to work, but the concave still alludes me.

Can anyone help with this or am I out of luck? Everything I have found on the internets is based on Convex Hulls, which are fairly simple.

Thanks!!