to calculate the area of a sphere from its radius, and to calculate its radius from its area.
I found a fun indie game called "Osmos" and im trying to make my own 3D version with some ideas I have for it.
http://www.youtube.com/watch?v=pso6UBicLWUbasically what I am working on now is the basic gameplay so whenever I collide with a smaller sphere what I want is my.scale=Radius(My_Area+Your_Area);
or implemented with my functions in the above post...
my.scale=Radius(Area(my.scale)+Area(you.scale));
when I get these basics working ill do some basic velocity vectors for movement&inertia and then I can start to add all these ideas i'm getting based around this simple game's gameplay.