Browsing by Author "KO, MT"

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AN INTERACTIVE APPROACH TO PLANNING SNAKE MOTION
(1994-07-01)
LIU, WB
;
KO, MT
;
CHANG, RC
;
資訊工程學系
;
Department of Computer Science
One of the most challenging research topics in computer animation is to model the motion of living animals, such as snakes. In this paper, we propose a new structure for modeling a snake's body and use an approach called sequential-goal constraints to simulate various motions of snakes. With this model, a snake's motion is simulated by assigning a sequence of control points along the snake's path and scheduling the times at which the snake passes through these points. The velocity of the snake's motion and the type of movement can be adjusted to meet the requirements of various animated scenarios. The outcome of the animation sequence is smooth and realistic.
SEQUENTIAL-GOAL CONSTRAINTS FOR COMPUTER ANIMATION
(1993-07-01)
LIU, WB
;
KO, MT
;
CHANG, RC
;
資訊工程學系
;
Department of Computer Science
The dynamic constraints technique has been proposed for building geometrical models composed of rigid bodies, which are made to act naturally, according to Newtonian laws, by specifying constraints on their states. In computer animation, the dynamic constraints technique alleviates the work-load of animators who formerly had to plan animated sequences in detail by intuition alone. Nevertheless, for some real-world applications, it is desirable to have a mechanism that makes physically-based elements move according to a given scenario by providing some control states. The control states can be represented by transient constraints that are to be met and then released immediately. In this paper, a technique called the sequential-goal constraints technique is proposed to provide such a mechanism. With the sequential-goal constraints technique, it is easy to specify transient constraints according to a given scenario and derive proper forces and torques to drive an element to meet each transient constraint exactly at a specified time so that the whole motion of the element is continuous and integral.