遗产bim模型未来证明歌剧院

Author:Hazlinda Mohd Nuron

The Saigon Opera House, one of Ho Chi Minh City’s most elegant and historical cultural assets, has a new digital identity to manage, preserve and protect this iconic building.

Built in 1898 by architect Eugene Ferret, and modelled on the Petit Palais in Paris, the much-loved municipal performing arts venue is also a heritage tourist attraction. The building was identified as being at risk because of its location in the heart of South Vietnam’s busy city.

Work carried out on the Metro beneath the theatre might further degrade the historic structure. Accurate digital condition surveys were needed to help the authorities successfully manage future renovations or even a complete reconstruction.

News of the fire that almost destroyed Notre Dame Cathedral in Paris gave the project an added impetus.

The General Director of Vietnam’s Portcoast Consultant Corporation, Mr Pham Anh Tuan, took responsibility for the work, assembling a 30-strong survey and engineering team to tackle it.

With vast previous experience of Leica Geosystems products, Mr Tuan chose a fleet of Leica Geosystems’ total stations, GNSS and 3D laser scanners, together with the latest integrated software, to deliver the project’s ambitious goals.

A three-phased approach

The first phase of work was to construct a base heritage-BIM model. As the original design documents and structural drawings had been lost over time, two data sets from different sources were required.

The raw spatial data of the existing structures was collected using geodetic equipment, cameras, UAV and 3D laser scanners, while the technical, historical information was sourced from national archives and research centres.

第二阶段涉及点云数据的建模和处理来构建剧院当前状态的3D数字表示。集成了有关颜色，材料，图案以及来源，历史和文化意义的详细信息的其他信息，以创建完整的BIM模型。

第三和最后阶段利用BIM模型to create a precise 3D visualisation, which could be shared with stakeholders, usingLeica TruViewand JetStream Viewer.

图安先生说：“只有使用尖端设备和软件才能实现数字化交付成果。使用由此产生的BIM模型，我们使用VR（虚拟现实），AR，（增强现实）和MR（混合现实）技术创建了一个bob综合app赌博精确的现实捕获可视化，最终通过令人印象深刻的是与利益相关者和公众分享这一点interactive virtual tour,featuring an accurate 3D model of the Saigon Opera House.”

该项目的所有阶段都使用了广泛的Leica Geosystems软件组合：Leica Infinity对于地理发射点云数据，LeicaCyclone 3DRto create the digital model of the statues and reliefs and the LeicaCloudworxplug-in for Revit to add the top roof frame truss system to the BIM model.

Capturing reality inside and out

用一个Leica Nova TS60，twoGNSS GS18 t, one图标ICR80和两个iCON gps70,the survey team set up over 350 georeferenced scanning stations to accurately capture point cloud data, from the stage and auditorium to the roof dome, basement, and outer walls.

As it was not possible to physically climb onto the roof, a crane was used to lift aLeica扫描仪P503D激光扫描仪可以捕获高动力范围（HDR）图像和测量级质量的歌剧院周围地区多达1公里的区域。

For the complex interior geometry, particularly in the narrow attic and basement spaces, where fast scanning time, accuracy, stability and manoeuvrability were essential, the徕卡RTC360and theLeica BLK360were ideal.

四个徕卡RTC3603D laser scanners were used for the columns, statues, reliefs, patterns, chandeliers and exterior details. The light and compact design of the BLK360 overcame the challenge of scanning the air-conditioning system located in the confined attic space.

“The accuracy of measurement and the density of the measured points was a key factor in our choice of hardware. High efficiency, flexibility and reliability of this equipment saved us time and manpower in every aspect of the project from initial control and georeferencing to the laser scanning and registration process,”图安先生说。

A priceless return on investment

Portcoast的年轻工程团队对Leica Geosystem的数字技术充满信心，这对建筑物所代表的历史和文化价值观产生了新的自豪感。

Mr. Tuan explains,“如果发生灾难，可以从数字记录中重建整个结构。在未来几个月和几年的必要时，数字化数据也可用于打印高精度铸造所需的3D型号，以复制原始的装饰功能。数字化确保了西贡歌剧院的美丽和威严将继续激发后代的居民和城市的游客。”

在这个遗产项目取得成功之后，市政当局现在有范围考虑将数字文档方法应用于胡志明市的大约150座历史，文化和艺术意义的建筑物。