????你是不是覺得如今電影和電視里的3D技術(shù)已經(jīng)非常了不起了,？別著急，先去去看看全息沙盤再說吧,。這項技術(shù)全名叫城市光學(xué)沙盤顯示系統(tǒng)（Urban Photonic Sandtable Display）,，由美國國防部（the Defense Department）下屬的研究機構(gòu)國防高級研究規(guī)劃局（DARPA）資助，主要用于作戰(zhàn)計劃制定,，能夠產(chǎn)生360度的3D圖形（無需佩戴3D眼鏡）,。雖然負(fù)責(zé)研發(fā)該技術(shù)的Zebra Imaging公司表示，至少還需3年時間,，沙盤技術(shù)才能用于外科手術(shù)規(guī)劃,、游戲等商業(yè)應(yīng)用，但這并不妨礙我們現(xiàn)在就開始暢想各種可能性,。以下是這技術(shù)的工作原理：
????虛擬模型：使用標(biāo)準(zhǔn)設(shè)計軟件或光線偵測和測距設(shè)備（Light Detection and Ranging,，簡稱LIDAR）創(chuàng)建高精度3D渲染模型，LIDAR能夠使用不可見的激光全面掃描現(xiàn)實世界里的建筑和物體。
????準(zhǔn)備全息圖：利用安裝在普通計算機上的專有軟件插件,，將3D圖形轉(zhuǎn)換成支持全息圖的文件,。在這個階段，用戶可以放縮,、旋轉(zhuǎn)全息圖或是改變光照參數(shù),。
????顯示：顯示器內(nèi)部的處理器和圖形處理單元能處理這些數(shù)據(jù)，隨后通過光調(diào)制器和一系列鏡頭產(chǎn)生由數(shù)百萬個全息元素hogel（即3D圖形像素）組成的圖像,。 |
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????If you think today's 3-D technology in movies and TV shows is cool, wait until you see your first hologram table. Funded by DARPA, the Defense Department's research arm, for battle planning, the Urban Photonic Sandtable Display produces a 360°, 3-D image (no glasses needed). Zebra Imaging, the company that is developing the technology, says it'll take at least another three years before this table is set for business applications like surgical planning or even gaming, but that won't stop us from thinking about the possibilities now. Here's how it works.
????Virtual models: Detailed 3-D renderings are created from standard design software or Light Detection and Ranging (LIDAR) devices that sweep real-world buildings and objects with invisible lasers.
????Prepping the hologram: A proprietary software plug-in loaded onto a standard computer converts the 3-D image into a hologram-friendly format. During this stage, users can zoom in or out, rotate, or change the lighting.
????The display: Processors and graphics-processing units inside the display crunch the data and send it through a light modulator and a set of lenses to create an image made up of millions of "hogels," the 3-D equivalent of pixels. |
