“ 3D自拍照”现在有点像日常平常。但是，并非每天都使用3D扫描和3D打印来创造世界上最著名的政治领导人，美利坚合众国总统巴拉克·奥巴马先生的半身像。作为世界上最知名的人民之一，也是世界上最有思想的领导人之一，巴拉克·奥巴马（Barack Obama）是标志。受到勇敢的亚伯拉罕·林肯（Abraham Lincoln）的美丽形象的启发，3D Tech被用来创建象征性的3D印刷形式，以对美国总统进行象征。这些肖像将在史密森尼城堡博物馆的下议院画廊中欣赏到本月底。
It was two years ago now that the Smithsonian Institution’s Adam Metallo and Vincent Rossi outlined a vision named ‘Next Generation 3D Portraiture: A Digital Life Mask Of President Obama.’Later, theWhite House Office of Science and Technology Policy（OSTP）听说了这个概念，并继续邀请史密森尼团队产生与总统的实际相似之处。与University of Southern California (USC) Institute For Creative Technologies, who brought along their Mobile Mobile Light Stage, the Smithsonian Institute spent time taking the President’s image.
First the USC assembled their Mobile Light Stage, which encompassess some fifty light sources, eight high quality digital single lens reflect cameras — with an augmentation of addition sources to the system to include a top-down and reverse panoramic view. The digital photographic scanning system captured some eighty photographs in just one second, spread amoung ten different lighting arrangements within that brief time.
From start to finish the whole process took no more than seven minutes of Mr. Obama’s time. Between the Mobile Light Stage and hand-held three dimensional scanners, a vast amount of physical data was read, then converted into a deep resolution digital model — indeed the bust is the highest resolution digital model of a head of state ever produced at some 15,000,000 triangles.
The Smithsonian team said:“因为我们设定的果阿l was to produce a full bust of President Obama, we augmented the Light Stage technology with an additional process to capture the top and the back of the head, as well as part of the torso. For the second stage of the portrait, we asked the President to sit still while Adam and Vince circled him with hand-held scanners. These scanners capture video of a pattern of light which deforms when it is projected on a subject. Based on the deformation, algorithms reconstruct this data into color 3D geometry. As Adam and Vince proceeded with the scan, those of us in the room could see the image emerging on the laptops tethered to the scanners. Last but not least, a round of hand-held photography ensured that detail that is difficult to resolve for the hand-held scanners would not be lost.”
The final piece however was not the awesome digital render of Mr. Obama, but the Selective Laser Sintered 3D print that the digital master file was used to produce. After the Smithsonian team had taken the scans and photographs they moved on to reconcile and analyse the data. It was an all-night affair for the team as they checked through each of the myriad detailed images one-by-one for optimal rendering and missing data areas. The team share on the Smithsonian blog that they experienced more than a little sense of relief and satisfaction when their preliminary post-processing produced a positive outcome for this ground-breaking Presidential portrait. The required data set was there. It was time to move on to the next stage!
It was just the next day when the team began transferring the data to world leading 3D design software company Autodesk, who amalgamated the Mobile Light Stage, 3D scanned and photographic data in post-processing. The Autodesk team put together a 3D model by registering the various data source geometries into a single space and normalising the unified colour information to prevent seams. The last stage was the addition of the output models base plinth to create a bust profile. Just two days later and the final 1:1 scale bust file had been transferred to 3D Systems who used nylon powder based Selective Laser Sintering (SLS) to 3D print the large bust, which stands at no less than nineteen inches tall. Given the size and resolution of the bust, the 3D printing took fourty-two hours. The result is simply beautiful.
从那里开始，美国总统能够亲眼目睹他的形象。奥巴马先生对他的3D印刷总统胸像印象深刻。最终的结果也在今年夏天的第一届白宫Makerfaire上展出。
Now, the Smithsonian Museum has opened an exhibit of the advanced manufactured ultra-contemporary presidential bust, in digital form as part of their史密森尼X 3Donline exhibition and physical form at their commons gallery at the史密森尼城堡博物馆from December 2ndto 31st. You can catch the White House video release of this interesting 3D printed project below.
