A new algorithm was presented herein to solve the highlight line, which was based on the arc-length parameterization.It transfers the traditional algorithm which uses surface-plane intersection to solve highlight lines, and improves the algorithm’s efficiency. In the new algorithm highlight line was obtained by numerically solving the initial-value problems for a system of first-order ordinary differential equations. Thereby, the new algorithm can be solved by ODE45 function of powerful MATLAB, which is based on adaptive 4-5-order Runge-Kutta algorithm.Finally, implementation examples

were also given to demonstrate its effectiveness and its efficiency was analyzed.

highlight line, surface interrogation, arc-length parameter, 4-5-order Runge-Kutta algorithm