摘要:随着建筑信息化模型的普及，工程项目审查脱离二维图纸进行建筑信息模型审查成为发展趋势。建筑信息审查从信息数据到实际审查的数据，通常需要借助算法来完成。本研究基于Revit平台，采用RevitAPI对Revit样例模型的房间轮廓线数据，研究了凸包算法在建筑外轮廓线计算中的应用；根据凸包算法的计算思路，提出一种基于线集合数据的通用计算方法-凹包算法，并研究了凹包算法在建筑外轮廓线计算中的应用；根据建筑模型的常用建模方式，提出一种更为适合计算建筑外轮廓线的方法——基于房间信息计算方法；对比了三种外轮廓线计算方法的精确度，给出了更适合计算建筑外轮廓线的算法。

Abstract: With the popularity of BIM technology and its application, project review and approval based on the trend that BIM has increasingly developed, instead of 2D drawing. BIM checking from model information data to checking data usually needs to apply kinds of algorithms. Based on Revit platform and RevitAPI, this paper studied the application of convex hull algorithm in the calculation of building contour. According to the convex hull algorithm, this paper proposed a general algorithm called concave envelope algorithm on the basis of MultiLineString data and explored the application of concave envelope algorithm in the calculation of building contour line. Depending on the common modeling methods of building models, this paper further presented a more suitable method for calculating the building contour with room information. Comparing the three calculation methods, a more suitable algorithm for building contour calculation was given in paper.