As we are thrown into an increasingly computer-savvy world, it seems the term “3D” comes up more and more. Whether it relates to the 3D you might see in the movies, the 3D in a brochure, or something entirely unexpected, 3D is everywhere. While you hear the term and see examples often enough, do you ever find yourself wondering “what the heck is 3D?”

Most of us realize that 3D is an abbreviation for three-dimensional— a concept we apply to everyday life and understand. We live in a 3D world where we can walk around objects, pick them up and see them from all sides. But how does this relate to computers, movies, brochures and all the media we see everyday claiming to use 3D? Perhaps the best way to understand 3D is to start with 2D.

Below we see a 2D image of a bowl of water with floating tea lights. In this image, the artist has given the illusion of depth through shading techniques. It looks as though the bowl is three dimensional, but it in fact is not. The bowl and its surrounding environment are flat, and for eternity will only be viewed from the perspective they were painted (unless the artist sketches from another angle).

Bowl of Water with Tea Lights

Here we see several images of a house created using 3D software. Next to the house is the 2D image described above. As we move around the house we can see that it has depth, whereas the 2D image is flat. Unlike 2D, 3D objects can be viewed from infinite angles, as well as moved from place to place, just like objects in the real world. The images we see below are merely “photographs” (known as renders in the 3D industry) where a 3D artist has navigated around the house on the computer and taken snapshots from interesting angles.

3D House and 2D Image from Front

3D House with 2D Image from Left Side

3D House and 2D Image from Right Side

Hopefully, the above example better defines what 3D is, but perhaps you’re now wondering why even bother. Why spend the time to build a 3D object and render it when you can take two seconds to snap a photo of its real-world counterpart and get the same result? The reason is control. It’s true, 3D can produce the same photorealistic effects a digital camera can; however, with 3D every variable can be controlled and manipulated. Imagine a photographer who could control the weather, add more branches to a tree, change the color of the sky, etc., and you would have a 3D artist. In addition to realistic objects, 3D software has the ability to create believable, non-realistic objects as we see often in movies (e.g., the fantasy characters in The Lord of the Ring movies, the cities in the latest Star Wars movies, etc.).

When trying to understand 3D, it is best to think about it in the context of real life. While 3D objects and their 3D environments may not exist outside of computer confines, they behave in the same way real-world objects do, and for all intents and purposes, can be thought of as such.