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。

Tuan先生凭借了先前的Leica Geosystems产品的丰富经验，选择了Leica Geosybob综合app下载stems的总站，GNSS和3D Laser扫描仪的机队，以及最新的集成软件，以实现该项目的雄心勃勃的目标bob apple。

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。

现有结构的原始空间数据是使用大地设备，相机，无人机和3D激光扫描仪收集的，而技术，历史信息则来自国家档案馆和研究中心。

The second phase involved the modelling and processing of point cloud data to construct a 3D digital representation of the current status of the theatre. Additional information on colours, materials, patterns, as well as details of origin, history and cultural significance were integrated to create a complete BIM model.

第三阶段也是最后一个阶段利用BIM模型来创建精确的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：“The digitalised deliverables could only be achieved with cutting edge equipment and software. Using the resulting BIM model we created a precise reality capture visualisation using VR (Virtual Reality), AR, (Augmented Reality), and MR (Mixed Reality) techniques, ultimately sharing this with stakeholders and the public through an impressiveinteractive 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 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, oneiCON 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 laser scanner into position to capture up to 1km of the area around the opera house in High-Dynamic Range (HDR) imagery and survey-grade quality.

对于复杂的内部几何形状，尤其是在狭窄的阁楼和地下空间中，快速扫描时间，准确性，稳定性和可操作性是必不可少的Leica RTC360and theLeica BLK360were ideal.

四个Leica RTC3603D激光扫描仪用于柱，雕像，浮雕，图案，吊灯和外部细节。BLK360的光线和紧凑的设计克服了扫描位于密闭阁楼空间中的空调系统的挑战。

“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,”said Mr. Tuan.

无价的投资回报

Confidence in Leica Geosystem’s digital technology amongst Portcoast’s young engineering team has engendered a renewed sense of pride in the history and cultural values the building represents.

Mr. Tuan explains,“In the event of a catastrophe, the entire structure could be rebuilt from the digital record. When necessary in the months and years to come, the digitalised data can also be used to print 3D models needed for high accuracy casting to replicate the original decorative features. Digitalisation has ensured the beauty and majesty of the Saigon Opera House will continue to inspire future generations of residents and visitors to the city.”

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。