I'm trying to simulate plant evolution to see if there's a genetic reason why fronds are so common in nature, and one problem I've come across is branch physics. Whenever a segment of a leaf or branch bends, not only does it affect the angle of all child segments (and thus how they'll bend), it affects the leverage the weight it carries has on its parent. Thus, the only good way to calculate how every segment bends is to have some fancy formula that also takes into account how everything else will bend. Is anyone here good enough at maths to do it? Segments vary in size, flexibility, and density/thickness(difference doesn't matter), by the way.