Generate a circle packing on a disc based on a Fibonacci distribution.

Input parameters:

1. N → Sample count.
2. D → Disc region to cover.
3. Mt → Circle packing method.
   • 0 → Fib. Spiral
   • 1 → Fib. Stacked
   • 2 → Square
   • 3 → Hexagonal
   • 4 → Octagonal

Output parameters:

1. Ci → Circle packing on disc.
2. Ef → Efficiency of packing. Total circle area divided by disc area.