Producto: Artec EVA
Industry: Design and Art
A controversial figure in the Western world, Mao Zedong stands out from the crowd of national leaders and other historical personalities for hundreds of millions of Chinese. The legacy of the founder of the People’s Republic of China is revered, thoroughly studied, and passed down from generation to generation.
A chapter in Great Helmsman’s life story was recently updated as 3D scanning technology was called upon to preserve for posterity the appearance of Chairman Mao’s favorite horse, which was taxidermied shortly after he died of old age.
What makes the horse so special?
Legend has it that the horse, nicknamed Little Blue One, saved its owner’s life during the Chinese Civil War (1927-1949). Who knows if modern China would be the way it is today if Mao’s horse had made a move at the wrong time during a military withdrawal operation called The Long March (1934-1935)
One afternoon, while Mao and his comrades were being chased by rival Kuomintang squads, Little Blue One with his owner on his back stopped under a cliff they were passing by. No one could understand why the horse simply refused to move until they heard a roar coming from afar – moments later, enemy combatants buzzed overhead. Thanks to Little Blue One, the group went unnoticed in the shadow of the cliff.
At the end of the Civil War, Mao brought his Little Blue, a horse with military merits at the time, to Beijing, where he lived his life in a special enclosure at the Beijing Zoo, until his death in 1962.
Conservation project: completed and reopened
Soon after, the Beijing Museum of Natural History ordered a taxidermy mount of the legendary stallion. After the work was done, the precious relic was taken to the Revolutionary Memorial Museum in the city of Yan’an, northwest China, where the Communist Party had its headquarters from 1935 to 1947.
As time passed, small cracks began to show up here and there, threatening to cause the entire mount to crumble, making the urgent need for restoration really pressing.
Before embarking on the project, the museum administration decided to make a high-precision digital copy of the support to compare its condition before and after restoration. The work was commissioned to Artec 3D Beijing Onrol Technology Co., Ltd. Gold Partner, who had the required experience in 3D digital archiving.
Choosing the right 3D scanner
Every day counted. The scan should be done in the shortest time possible. The Onrol team was given just one day to scan the horse in 3D and convert the collected data into a flawless 3D model.
Attaching targets to the object for better tracking was just out of the question. Even touching it was forbidden, not to mention the use of any hardware that could pose a risk to its condition.
It didn’t take much deliberation to choose Eva as the 3D scanning tool for the project. This portable scanner has been the device of choice for quality control and heritage preservation with companies and institutions ranging from Tesla to the British Museum.
Absolutely safe to use, Eva has a flash bulb and a set of LED lights, the same as in lamps found in any room, to project a structured light beam onto the surface of an object and detect its curves with a precision of up to 0.1 mm.
Along with the object’s shape, Eva captures the texture with a color depth of 24 bits per pixel, giving more than 16 million color variations – more than the human eye can perceive. Capturing Little Blue One in true color was vital to the project.
Scanning speed mattered no less than the quality of the scans. Eva can take up to 16 frames, or snapshots, per second. Each snapshot covers an area approximately the size of a sheet of paper from A4 to A3. This field of view is ideal for working with medium and large objects, such as horseback. When moving around the object, the user takes several snapshots with the scanner of it to 3D digitize the entire surface in a minimum time, preserving all the necessary details.
Ultimately the scanner is very light (0.9kg) and easy to handle, which was another factor that tipped the scales in Eva’s favor.
On-site 3D scanning
On the appointed day, Little Blue One’s taxidermy mount was taken to a designated workshop, where scan specialists from Onrol performed scans, one holding the scanner and the other holding a laptop to which data from the scanner was transmitted.
The team used Real-Time Fusion, a tool from Artec Studio’s 3D scanning and processing software that merges the raw data into scans on the fly. In most cases, especially if the object is large and has complex geometry, full processing is required after scanning, but thanks to real-time fusion, the user can see a preview of the final 3D model on their screen during the scan and immediately understand if the collected data is complete or if some parts of the surface have been lost. Since the possibility of a second scan session was ruled out, Artec Studio’s real-time fusion played an indispensable role.
Simplified 3D data processing
Initial processing of the raw data was done on-site, taking only a few minutes. After verifying that they had gathered all the necessary data, the Onrol team headed back to their office to process the scans into a high-resolution 3D model in Artec Studio.
Artec Studio is loaded with a number of powerful features, allowing you, for example, to automatically remove the base on which the object was scanned, or to organically repair and seal holes and gaps in your scans. The software even takes care of the brightness while scanning, adjusting it to avoid overexposure. When is it really useful? If the lighting conditions were far from ideal during the scan, you may end up with one side of the object being brighter than the other and then having to spend hours fixing that. With automatic brightness adjustment, there is nothing to worry about.
The finishing touch, the texture mapping, was done at a rapid pace, all thanks to the fact that version 14 of the software, which was used in the project, saw an 800% increase in the speed of mapping textures.
Now, the 3D model was ready, and its measurements (length, width, and height) were taken.
All objectives met
Obtaining the 3D model of Little Blue One, the museum proceeded to the restoration. After it was completed, the montage was 3D scanned with Artec Eva and measured in Artec Studio again. No critical discrepancies were found between the two 3D models of the horse, attesting to the high quality of the restoration work.
The Onrol scanning team and museum administration agreed to collaborate further to monitor the condition of the restored mount so that it can be preserved centuries ahead.
The timely three-dimensional digitization of precious artifacts is key to preserving cultural heritage and advancing research in anthropology, paleontology, and a number of related fields. If they are shared or posted online, the high-resolution 3D models of artifacts can be accessed by anyone with an interest, regardless of where they are located. 3D scanning technology is an easy way to create digital doubles of fossils and specimens at excavation sites, or museum exhibits, avoiding the need for any physical contact with the object. Ultimately, 3D models can be displayed through interactive virtual reality platforms, expanding the reach of museums both locally and around the world.