How Metrology 3D Scanning Technology Solves the Precision Challenge of Double-Curved Curtain Walls

Metrology 3D scanning technology is helping YuanDa Aluminium solve one of the most difficult challenges in architectural curtain wall fabrication: accurately machining and assembling complex double-curved aluminium profiles.

By integrating high-accuracy 3D scanner from SHINING 3D with five-axis machining centers, Shenyang Yuanda Aluminium Industry Engineering Co., Ltd. has developed a digital inspection and machining workflow that enables precise positioning before fabrication and accuracy verification after assembly.

The technology has been applied to some of YuanDa Aluminium’s most demanding facade projects, including the curtain wall of OPPO’s global headquarters, which was completed at the beginning of 2026. The company has also recently signed a curtain wall construction contract for 740 Eighth Avenue, a high-rise project in the heart of Midtown Manhattan, New York.

Curtain wall under construction

These projects reflect more than YuanDa Aluminium’s international project capabilities. They also demonstrate how advanced 3D scanning and digital measurement technology can help turn highly complex architectural designs into accurately manufactured and installed curtain wall systems.

Why Double-Curved Curtain Walls Are So Difficult to Manufacture

Architects are increasingly using curved and free-form facades to create distinctive buildings and more expressive city skylines. But the more complex the geometry becomes, the more difficult it is to manufacture the aluminium profiles accurately.

Double-curved profiles are particularly challenging because their geometry changes continuously in three dimensions.

“Double-curved profiles are almost like twisted strands. Their geometry is extremely irregular, and conventional fabrication methods are simply not capable of handling this level of complexity,” says Wang Yang, an engineer at YuanDa Aluminium.

Profiles for curtain wall fabrication

During the fabrication process, aluminium profiles are normally left with machining allowances. Manufacturers must determine the exact locations for cutting, end trimming, drilling, and other machining operations based on the actual geometry of the profile.

This creates two critical questions: Where exactly should the profile be machined? And how can the manufacturer verify that the finished assembly matches the original design?

Conventional measurement methods can make it difficult to establish accurate machining positions before fabrication. Once profiles are assembled, they also provide limited options for carrying out a comprehensive dimensional inspection. For complex curtain wall systems, this can create a gap between the design model, manufacturing process, and finished assembly.

YuanDa Aluminium addressed this challenge by introducing high-precision 3D scanning into the fabrication process.

High-Accuracy 3D Scanning Creates a Closed-Loop Manufacturing Process

YuanDa Aluminium uses the FreeScan Trak Pro series metrology 3D scanner from SHINING 3D and integrates it with five-axis machining centers. The fabrication team establishes a more accurate machining position before processing and then verify the finished assembly afterward.

The result is a 3D scanning, machining, assembly, and 3D inspection workflow that provides a closed loop for dimensional accuracy control.

SHINING 3D FreeScan Trak Pro series 3D scanner: a dynamic tracking system designed for large-scale objects scanning

3D Scanning Before Machining: Establishing Accurate Machining Positions

Before an aluminium profile is machined, technicians use the 3D scanner to capture its complete geometry. The scanner generates detailed 3D measurement data of the actual profile. The inspection software then compares the measured data with the original CAD or design model through data fitting and alignment.

Based on this comparison, the system determines the precise machining locations and required parameters.

The resulting data is then used by the five-axis machining center to perform the required operations. This integration of 3D scanning and five-axis machining solves a fundamental problem in complex profile fabrication: accurately locating machining features on a three-dimensional component. It also provides better control over machining tolerances and reduces the risk of positional errors being carried forward into subsequent assembly stages.

“By integrating 3D scanning with five-axis machining, we solved what had been a widely recognized challenge in the industry,” says Wang Yang.

“YuanDa Aluminium has now established multiple 3D scanning + five-axis machining workstations in our production facilities to meet production efficiency requirements.”

3D scanning of profiles

3D Scanning After Assembly: Verifying the Finished Curtain Wall Unit

Precision control does not end when machining is complete. After the aluminium profiles have been assembled into installation units, YuanDa Aluminium performs a second 3D scanning inspection. At this stage, the assembled unit can be measured as a complete three-dimensional structure and compared against the design model.

The purpose is straightforward: make sure the finished assembly is where the design says it should be.

3D scanning of profiles

Scanned data and inspection color map

Advanced Technology Supporting the Global Growth of Chinese Curtain Wall Engineering

The value of high-accuracy 3D scanning is ultimately measured by what happens on the building. YuanDa Aluminium’s experience shows how digital measurement technology can be integrated into a large-scale curtain wall manufacturing workflow.

As architectural design continues to demand more complex geometries, high-precision 3D scanning will play an increasingly important role in curtain wall fabrication and quality control.

For YuanDa Aluminium and SHINING 3D, 3D scanning technology is part of a manufacturing approach that connects digital design, precision machining, assembly, and final verification. It helps bring some of the world’s most challenging facade designs from the screen to the building.