摘要
对拱桥结构特点进行分析,依据构造实体几何法理论,提出三维图形变换结合二维面域推移生成三维实体的建模方法,利用Visual C++和ObjectARX工具,通过建模参数,创建封闭图形区域和推移路径,由推移表示法形成桥梁等截面或变截面结构立体,运用平移和镜像等变换方法组装整桥,并以拱桥建模为例实现参数化三维建模,为桥梁三维建模提供新的思路.
Based on the analysis of structural features of arch bridges and constructive solid geometry,the modeling method of combining three-dimensional graphics transformation with two-dimensional region sweeping is presented for generating three-dimensional solids.Closed graphic region and sweep path are created by utilizing Visual C＋＋,ObjectARX and modeling parameters. The solid components of constant section and variable cross-section are then formed by sweep representation.Finally,the whole arch bridge is erected by a series of transformation methods including move and mirror.An example of bow-string arch bridge is proposed to illustrate the modeling process,which provides reference for similar practices.
出处
《兰州交通大学学报》
CAS
2014年第3期150-155,共6页
Journal of Lanzhou Jiaotong University
基金
甘肃省自然科学基金(1212RJZA042)
关键词
桥梁结构
三维建模
OBJECTARX
图形变换
布尔运算
bridge structure
three-dimensional modeling
ObjectARX
graphic transformation
Boolean operations
