Free-form surface closest comparison spherical curvature radius and vertex coordinate acquisition method

The invention discloses a free-form surface closest comparison spherical curvature radius and vertex coordinate acquisition method, which comprises the following steps: S1, acquiring parameters, and generating a comparison spherical population; s2, calculating the fitness value of each individual in the step S1; s3, after the fitness value of each individual in the population is traversed, the maximum fitness individual and the minimum fitness individual in the population are obtained; s4, judging whether the most adaptive individual meets the condition or reaches the maximum genetic algebra, and if not, replacing the current maximum fitness with the current maximum fitness which is greater than the global maximum fitness; s5, if the result obtained in the step S4 is yes, outputting the most adaptive individual as the optimal result, namely the radius and the coordinate of the closest comparison spherical surface of the free-form surface; and S6, calculating the removal allowance closest to the comparison sph