一种高效实用的有限元模型消隐方法

A Efficient and Applied Hidden Method for FEM Models

介绍了一种新的有限元模型消隐方法。根据有限元模型的特点 ,利用三维线框模型中点、线、面的遮挡关系和平面域上的包含性规则 ,对内部线段作直接消隐 ,对边界上的线段则通过二次坐标变换的方法检查其显、隐程度以实现最终消隐。为避免弧长法中求代数符号以加快消隐速度 ,提出了在平面域上进行点的包含性检查的新的计算公式。方法被应用于可视化通用结构分析系统 VSES中 ,取得了满意的效果 ,速度快、稳定性好。

A new hidden method for FEM models was introduced. While the characteristics of FEM models were taken in to consideration, the relation among the vertexes, the lines and the faces and the comprising rule of a point in a plane were studied so that the hidden velocity can been faster. The lines were divided into two groups inner lines and boundary lines, then were hidden respectively. Twice coordinate transfers were applied to analyse whether a boundary line should be hidden. Moreover, a new expression for comprising rule was presented. The application in a system VSES shows that the new method was feasible and effective.