Fig. 2. The datasets used in this study. (a): surface mesh represents real pelvis. (b): surface mesh represents real knee. Fig. 1. Graphical illustration of Dice similarity coefficient. Fig. 3. General Schema of the Evaluation Process. International Journal of Computer Applications (0975 - 8887, Volume 183 - No.9, June 2021 Table 4. Evaluating DSC on different size-reduced versions (surface-simplified). (using UMR approach) Figure 5 plots, for the PSR technique, the value of DSC for diverse values of a . The value at which parameter a amounts to the largest DSC possible value are illustrated using red ellipses in Figure 5. It is clear from Figure 5 that selecting a value for a in the interval [00.90 - 01.00] is the optimal selection to keep the quality of the reduced mesh close to the quality of the original one. Fig. 5. DSC for various Offsetting values. Red ellipses represent the value at which a amount to the largest value of DSC.