電影分2D, 3D & 4D是怎樣分?

三維電腦圖形（3D computer graphics）是電腦和特殊三維軟體幫助下創造的藝術作品。一般來講，該術語可指代創造這些圖形的過程，或者三維電腦圖形技術的研究領域，及其相關技術。

三維電腦圖形和二維電腦圖形的不同之處在於電腦記憶體儲了幾何數據的三維表示，用於計算和繪製最終的二維圖像。

一般來講，為三維電腦圖形準備幾何數據的三維建模的藝術和雕塑及照相類似，而二維電腦圖形的藝術和繪畫相似。但是，三維電腦圖形依賴於很多二維電腦圖形的相同演算法。

電腦圖形軟體中，該區別有時很模糊；有些二維應用程序使用三維技術來達到特定效果，譬如燈光，而有些主要用於三維的應用程序採用二維的視覺技術。二維圖形可以看作三維圖形的子集。

4D - Time-lapsed series of 3D earth models
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4D consists of time-lapsed 3D series of solid models generated from measured data, to represent the state of the subject body at two or more different times. This method is often used in petroleum exploration and production as well as in medical imaging to observe the changes that has taken place over time.

In petroleum production, 4D is accomplished by re-acquisition of 3D seismic data over a producing field, for comparison with one or more earlier surveys in order to visualize how effectively the oil reservoir has been drained, and to identify areas of by-passed petroleum that should be targeted.

2007-05-05 13:05:21 補充：
簡單來說:2D --- 平面 (一般戲院看到的)3D --- 視覺上立體，要用3D眼鏡 (一般戲院看的)4D --- 視覺上立體，要用3D眼鏡，要到特別機械入面睇(會搖擺的)