Turtle shape function for openSCAD

gistfile1.txt

function sum(parts, i=0) = (i < len(parts)-1) ? (parts[i] + sum(parts, i+1)) : parts[i];
function turtlePoints(
	commands,
	i = 0,
	prev = [0,0]
) = let(
	s = sum(commands[i]),
	current = i == 0 ? s : (prev + s)
) concat(
	[current],
	(i < len(commands)-1) ? turtlePoints(commands, i+1, current) : []
);