Roam engine, which is all-purpose and independent of model, of virtual environment is designed. Camera control, collision detecting and planar map control are discussed.

设计了较为通用的、与模型无关的虚拟环境漫游引擎，并分析了其中的相机控制、碰撞检测和二维地图控制等技术。

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Based on the theory of conformal map, map model is built for planar parametric circle, rectangle and polygon regions. The boundary of parametric region rests with the need of tool path planning.

根据协调映射的理论，建立了平面上圆形域、矩形域、多边形域等参数域的映射模型，可根据轨迹规划的需要来选择映射的边界。

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In this paper, a new planar chaos map is presented which is tent map on square, and it is applied in stream cipher.

提出了一种新的二维混沌映射—平面方体上的帐篷映射，并用于流密码的构造。

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It states that any planar map (that is to say, a flat one) can be coloured with at most four colours in a way that no two regions with the same colour share a border.

ECONOMIST: Just what does it mean to prove something?