A Study on Visual Simulation of Creatures in the Sky

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We built a flight model of a fluttering butterfly based on a fundamental flapping flight model that was based on a quasi-stationary state. With this model, we confirmed in a simulation test that the flight characteristics of some types of butterflies could be reproduced. In addition, we expanded this flight model to that of a bird flapping its wings, in which the flight characteristics of a bird can be reproduced.For flight control, we developed a method of setting control points in space. In this method, the control ol the vertical and lateral directions of a flying creature, of a bank, and of the frequency of wing flapping enables a simulated flying creature to pass control points in a specified order.As a method of representing a flock of birds, we developed a follow-the-leader type model and a Boid type model. In the former type, a flock is organized such that the rest of the flock follows a leader. The latter type incorporates a flock representation called a "Boid." In the Boid method, movement vectors for the movement of individuals are created to act on each member of the flock directly. However, the proposed model cannot actually enable a movement vector to act directly on each bird since birds only fly with the force they generate by flapping their wings. Therefore, we set dynamic control points for each bird, and let a movement vector act on the control points. This method enabled the display of a flock of about twelve birds in real time on a PC equipped with a Pentium 4 running at 1.7 GHz and a GeForce 3 video card.