遗产bim模型未来证明歌剧院

作者：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.

大火几乎摧毁了巴黎的巴黎圣母院大教堂的消息给了该项目的额外动力。

越南Portcoast顾问公司的总主任Pham Anh Tuan先生负责这项工作，组建了一个30人的调查和工程团队来解决该工作。

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

工作的第一阶段是构建基本遗产bim模型。由于原始的设计文档和结构图随着时间的流逝而丢失，因此需要两个来自不同来源的数据集。

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。

第三阶段也是最后一个阶段利用BIM模型创建精确的3D可视化，可以与利益相关者共享，并使用Leica 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，Leica旋风3dr创建雕像和浮雕的数字模型和莉卡Cloudworxplug-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,调查团队设置了350多个地理参与扫描站，以准确捕获从舞台和礼堂到屋顶圆顶，地下室和外墙的点云数据。

As it was not possible to physically climb onto the roof, a crane was used to lift aLeica扫描仪P503D激光扫描仪位于高动力范围（HDR）图像和测量级质量的歌剧院周围最多1公里处。

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

四个Leica 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。