This is a simulator for curled index and thumb in marble-shooting pose.
The ball is tangent to the finger tips. If tangency not possible, ball disappears meaning no solutions.
Click on the + signs by the right side of the sliders and you could make small increments or decrements. Default is 0.01.
Thumb/Finger slider gives the percentage of tangent point across the tip of the fingers.
You will notice that for most of the parameters there is no solution, actually solutions are quite difficult to obtain.