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在由三维模型自动生成二维工程图的过程中 ,可以根据三维模型的信息实现在二维工程图上的自动尺寸标注。然而这些自动标注尺寸往往十分杂乱 ,无法满足尺寸布局的要求。在对尺寸和视图进行几何简化的基础上 ,建立了尺寸布局的几何模型。针对工程图中大量存在的水平尺寸和竖直尺寸 ,提出了一种基于尺寸子集划分的自动布局算法。在寻找最佳尺寸布局时采用了模拟退火算法。该方法已在自行研制的三维 CAD系统中实现
In the automatic generation of 2D drawings from 3D models, automatic dimensioning on 2D drawings can be realized based on the information of 3D models. However, these automatic dimensioning is often very messy, unable to meet the size layout requirements. Based on geometric simplification of size and view, a geometric model of size layout is established. Aiming at the existence of a large number of horizontal and vertical dimensions in engineering drawings, an automatic layout algorithm based on the size subset is proposed. Simulated annealing algorithm was used to find the best size layout. This method has been implemented in a self-developed 3D CAD system