About 3D computer graphics

surface: http://en.wikipedia.org/wiki/3D_computer_graphics
3D computer graphics (in contrast to 2D computer graphics) are graphics that use a three-dimensional representation of geometric data (often Cartesian) that is stored in the computer for the purposes of performing calculations and rendering 2D images. Such images may be for later display or for real-time viewing.
Cartesian = 笛卡爾或卡氏幾何

三維電腦圖形（相對於二維電腦圖形(2D computer graphics)），是於電腦內部記憶體儲了幾何資料(geometric data)的三維表示，用於計算和繪製二維影像。此類圖片可能會後顯示或實時觀看。

Despite these differences, 3D computer graphics rely on many of the same algorithms as 2D computer vector graphics in the wire-frame model and 2D computer raster graphics in the final rendered display. In computer graphics software, the distinction between 2D and 3D is occasionally blurred; 2D applications may use 3D techniques to achieve effects such as lighting, and primarily 3D may use 2D rendering techniques.

儘管這些差異，三維電腦圖形依賴許多相同演算法( algorithms)的二維向量圖形( vector graphics)的線框模型(wire-frame model )及二維點陣圖形(raster graphics )呈現在最後的顯示。在電腦繪圖軟件，二維和三維兩者之間的區別有時很模糊;二維應用程式使用三維科技來達到特定效果，譬如燈光，主要是三維的應用程式採用二維的渲染技術。

3D computer graphics are often referred to as 3D models. Apart from the rendered graphic, the model is contained within the graphical data file. However, there are differences. A 3D model is the mathematical representation of any three-dimensional object (either inanimate or living). A model is not technically a graphic until it is visually displayed. Due to 3D printing, 3D models are not confined to virtual space. A model can be displayed visually as a two-dimensional image through a process called 3D rendering, or used in non-graphical computer simulations and calculations.
三維電腦圖形通常被稱為三維模型(3D models)。除了提供圖形，模型都包含在圖形數據文件。但是，它門是不同的。三維模型是任何三維( three-dimensional)物體（無論是無生命或生活）的數學表示。 模型並非是技術上的圖形而是直觀顯示的。由於立體印刷( 3D printing)，三維模型並不限於虛擬空間。一個模型可以顯示視覺為二維圖像，通過這個過程被稱為3D渲染(3D rendering)，或使用非圖形電腦模擬( computer simulations)和計算。

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