| OCR Text |
Show ,68 W{i). Roughly, ratio of the specular reflection of the reflected material like aluminum is about sixty light. The reflection coefficient Appendix a is II will around give is four. case ten of percent For. the highlY a incident white flat white paint, the specular a percent, and the power is n equal to two, values for the ratio W(i) and the power some n for sample of various materials. IV. 5 Other interpolation As Was does not give non-linear I in that n power light simulating pointed out previously, the linear interpolation function shading a interpolation scheme interpolation resulting schemes. in increased polygonal some computation description Two model. undesirable time and possible Unfortunately, Problems unsolvable non-linear exhibit these problems are presented here: (1) . the normal continuous first derivative, thus a may be desirable. present cur7s with of a higher a degree of additional conditions due problems interpolation to the schemes which (2) and spline under tension a cubic function. The notion of spline under tension It is attempt an production can be to imitate cubic of extraneous inflection physically compared to a splines, points light introduced was with the in the curve. by Schweikert advantage of avoiding the A occurrence of extraneous inflection and flexible bar which passes points can tension under spline given points and which responds to the tension produced by pulling The [28J. be then avoided throug the on its ends. by varying the tension. A representation of the spline under tension is given bY' Cline [29), |
