A Study on Visual Simulation of Creatures in the Sky

基于准稳态的基本振翅飞行模型，建立了振翅蝴蝶的飞行模型。利用这个模型，我们在模拟测试中证实，某些类型的蝴蝶的飞行特性是可以复制的。此外，我们将该飞行模型扩展到鸟类拍打翅膀的飞行模型，从而可以再现鸟类的飞行特性。对于飞行控制，我们开发了一种在太空中设置控制点的方法。在这种方法中，控制飞行生物的垂直方向和横向方向、倾斜方向和拍打翅膀的频率，使模拟飞行生物以指定的顺序通过控制点。作为一种表示鸟群的方法，我们开发了一个follow-the-leader型模型和一个Boid型模型。在前一种类型中，一个群体被组织起来，其余的群体跟随一个领导者。后一种类型包含称为“Boid”的群体表示。在Boid方法中，为个体的运动创建运动向量，以直接作用于群体的每个成员。然而，所提出的模型实际上不能使运动矢量直接作用于每只鸟，因为鸟类只能通过拍打翅膀产生的力来飞行。因此，我们为每只鸟设置动态控制点，并让运动向量作用于控制点。这种方法可以在配备了运行频率为1.7 GHz的Pentium 4和GeForce 3显卡的PC上实时显示大约12只鸟。

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.