In curve design, it is important to grasp macroscopic shape information that emerges from the interaction of shape elements and to control it appropriately, due to the human characteristic of recognizing the whole shape feature macroscopically. However, in conventional curve design using CAD, the information that represents microscopic shape feature quantitatively is mainly displayed, and the macroscopic shape information is grasped and controlled based on the experience and intuition of the designer. From these backgrounds, we have advanced our research for the construction of quantification method of "complexity", the macroscopic shape information, and that of curved profile generation method that allows manipulation of "complexity." This paper describes the cognitive experiment on the influences of human characteristics, such as individual difference in recognition, and of environmental characteristics, such as change of displaying size and direction. Based on the result of the cognitive experiment, this paper shows that "complexity" cannot be easily influenced by human characteristics or environmental characteristics, and may be quantified only in physical quantity computed from the whole curved profile.
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