Rescue Mission: Using reality capture to plan the re-development of a former convent

作者：AndréAzevedo

Next to the Carmo Church in Braga, Portugal, sits a former Carmelite Convent founded in 1653. No longer occupied and in need of significant repair, the convent compound was acquired by property developer and renovation experts, Fortera.

为了确定包括保险库，阁楼和水功能在内的复杂网站的最佳方法，Fortera询问了土木工程公司构建to carry out a complete geometric survey. To capture the data needed to build a BIM model, André Azevedo, technical manager at Buildgest used a Leica Geosystems 3D laser scanning solution.

Visualising the environment as it is in 3D

修道院有一个复杂的内部和exterior made up of multiple buildings, levels and outdoor space. Before Buildgest was appointed, Fortera had already commissioned a 2D survey. Unfortunately, this didn’t capture sufficient detail for them to move into the design phase of the development confidently. Azevedo explains, “The classic 2D survey has some flaws, so we proposed a laser scanning survey and an accurate architectural model for the building. This Building Information Model (BIM) will help the client´s architect team to study different intervention scenarios.”

使用简化的现实捕获解决方案在现场更快的扫描速度bob综合app赌博

With a potential construction area of 5,000 square metres, complex geometry and a six-week deadline, Buildgest needed to carry out their fieldwork quickly. If they took too long, their modelling team would not have enough time to complete the work.

Already a Leica Geosystems users, Azevedo chose theLeica BLK360imaging laser scanner,旋风寄存器360，，，，旋风场360，3dreshaper（Cyclone 3DR) andJetstream观看器software elements.

“We needed equipment that can produce interior scanning quickly and accurately. The scanner is small and light compared to other equipment and that facilitated transportation to difficult zones of the buildings like attics and caves. The workflow between the products and software is smooth and quick. For example, Cyclone FIELD 360 pre-registers the scans automatically. That gives us faster scanning in the field,” explains Azevedo.

600 scans in seven days

Azevedo and his team used two BLK360 scanners in parallel for seven days to scan the convent buildings. The BLK360 - the smallest and lightest imaging laser scanner of its kind - captured the site with full-colour panoramic images overlaid on a high-accuracy point cloud. To make sure that the overall point cloud was accurate, Buildgest established a survey control network with laser scan targets around the building and in the interior.

总共进行了600张详细的扫描。为了提高效率，Azevedo使用Cyclone Field 360移动设备应用程序在仍在现场时预先注册点云。用他的话说：“对现场收集的信息进行预注册为后处理任务节省了时间。”

易于同步，互操作性和处理

Back in the office, the Buildgest team used Cyclone REGISTER 360 to clean and register the scans, creating a unified point cloud. Azevedo says, “The synchronisation between Cyclone FIELD and Cyclone REGISTER is good and makes it easy to use.”

Processing included giving some shapes more definition. “Ornamental details, like the central water fountain that lies on the internal patio was modelled with the help of 3DReshaper,” Azevedo explains. The data was then processed further by a team of two modellers over a period of five weeks to create a complete architectural BIM model for the client. Azevedo explains the value of accurate scan data to this process, “Modelling the existing vaults of the convent was challenging and the use of point cloud helped us to have a complete understanding of the geometry of these elements.”

“通过摄影记录来查看模型很有帮助”

几何调查时完成,Buildgestpresented their findings to Fortera. As well as delivering the BIM model, and an LGS file of the data, Buildgest used a Cyclone Publisher Pro and JetStream Viewer to show the client how to explore and move the point cloud. They see this as the best way to communicate the results.

“我们始终向客户推荐Jetstream观看器，因为使用摄影记录来查看模型更为具体和有用。使用查看器，客户端能够看到在扫描过程中捕获的360张图像。此外，它使他们可以选择使用简单的直观工具导航点云。” Azevedo解释说。JetStream Viewer Portable是一个免费的，不安装的版本，旨在轻松可视化，以便没有调查培训经验点云数据的人。

构建was able to complete the project quickly without compromising on quality. Pedro Ferreira, chief engineer at Fortera, says, “Fortera was truly satisfied with the amount and quality of information that was delivered.” Now it’s over to the developer’s architects to plan a reinvention of the buildings, adding another chapter to the convent’s 350-year story.