[C#] Algorithm for randomly packing random radius sphere in fixed radius sphere.

Hello. I'm looking for some algorithms for problem, which i type in topic. I need to pack as many as possible but randomly spheres with random size (from range to range) into fixed size sphere. They cant overlap each other.

Inputs:

• Radius of external sphere

• Minimum and maximum range of radius internal spheres.

I need it for my map generator.