This paper analyzes the simulation operation flow of Bullet physics engine. Based on this analysis, four kinds of multi-rigid-body game characters are designed. This paper also profiles the performance metrics such as the CPU utilization, the memory usage, and the computation time by multi-rigid-body character simulations. For the CPU utilization, the Tongs Vehicle is the best and provides 45.1% less than the other character simulations. The computation times of the Four-leg robot and the Dragon are longer than those of the others. The memory usage of the Dragon simulation is the largest, which is average 1.32 times more than the others. Because all parts of Dragon are composed of triangular mesh models in 3DMax. The performance profiling with the criteria such as reducing the computation time and the computing resources, the complexities of the collision shapes, and the number of rigid bodies takes an important role in the design of the multi-rigid-body game characters.

Purpose: The purpose of the current study was to provide preliminary evidence for reliability and validity of a new golf performance profiling technique. The technique was designed to assess both ideal need states required for successful performance in competition and present performance states of an athlete. Methods: Two groups of golfers responded to the golf performance profile comprised of important elements of golf skills, physical fitness and psychological skills. An additional group of golfers participated in psychological skills training (PST) sessions. Scores on need state, current state were measured before and after the PST sessions. The number of weeks until the golfers who attained their optimal zone on their performance elements actually showed their personal best performance was monitored. Results: The results from test and retest (1 week and 4 week distance) showed temporal stability across different performance elements. Golfers who participated in PST demonstrated improved scores on the majority of the elements, which could be an evidence of validity. Those reached optimal zones in the performance profile achieved their personal best performance within an average of 17 weeks. This golf performance profiling technique would be a useful tool for motivating athletes’ preparation toward competition and predicting their successful performance.