This article established the mechanism of scenechart management and Viewing Volume cut and designed the LOD model, then realized real-time display and alternating operation of the 3-d scene.
建立了场景图管理机制和视景体裁剪机制，设计了LOD模型，实现了三维场景的实时显示和交互操作。
2
In this scene system, Derive ocean geographic information database from actual electronic chart data, and according to these database build ocean terrain and entity model database.
Look at the nearby chart. It is like a photo of a mountain scene reflected in a tranquil lake. The rises and falls and horizontal meanderings of gold are nearly the negative of the dollar's.