The flame from the first slide in the review had the parametrization
r(t,s) = (cosh(t) sin(3 A s), sinh(t) sin(3 A s), cosh(s))where A is a parameter which is changed for seeing the movie. The cosh(x) function is defined as cosh(x) = (exp(x)+exp(-x))/2 and sinh(x) = (exp(x) - exp(-x))/2. |