虚拟实体对象建模语言SCPL

本文给出一种新的虚拟实体对象建模语言ＳＣＰＬ。这种语言以基于控制论的行为模型ＳＣＰ为中心组织虚拟实体对象的建模，具有实现连连续和更复杂行为的能力，适用领域广。

VIRTUAL ARTIFACT MODELING LANGUAGE SCPL

As a major approach to develop virtual reality applications, many virtual reality modeling languages have been proposed and implemented. However, these modeling languages still have some shortcomings, such as the lack of supporting behavior reuse or using artifacts with behaviors as sub artifacts, which restrict their wider application. For this reason, a new virtual artifact modeling language called SCPL, is proposed to solve these problems. Its principles, grammar, features, and some implementation details are given in this paper. SCPL is based on a Cybernetics based behavior model SCP. It is capable of describing complex behaviors such as continuous ones. In SCPL, the control of behavior is encapsulated inside artifact. The control mechanism such as events gathering, transmitting and reacting are all done by artifact itself. This feature makes artifacts' behaviors relatively independent and concurrent. Another noteworthy feature of this language is that behaviors can be defined outside of any artifacts, since the behaviors can be reused independent of artifacts. In addition, even nested sub artifacts with behaviors are supported naturally in SCPL. Finally, some comparisons between SCPL and some other virtual reality modeling languages are given. The results show that SCPL programs are more succinct and can run faster at run time.