But you can also see that the first point (3,3) can be moved (or translated) closer to or farther away from the origin. If we draw a line from the origin at (0,0) to (3,3) we get the following:Īs you can see, the introduction of the origin as the second point gives our vector a direction. So what is the second point? The missing point is the origin located at (0,0). We all know that it takes two points to form a line. To understand how this represents a direction you need only look at the following graph. One of the toughest things beginners have difficulty with when it comes to vectors is to understand how something that seemingly looks like a point in space can be used to describe a direction. ![]() 4D vectors can be used to describe something else, for example a color with an extra alpha value. Vectors can be 1D (contain only x), 2D (contain x, y), 3D (contain x, y, z), even 4D. They typically contain one or more components such as x, y and z. You would usually find a vector object as part of some math or physics library. In game development it often can be used to describe a change in position, and can be added or subtracted to other vectors. In mathematics, a vector is a construct that represents both a direction as well as a magnitude. Article assumes familiarity with algebra and geometry, some programming language, a basic knowledge of OOP. Even though it focuses on 3D, most things explained here also work for 2D. ![]() ![]() This article will introduce you to 3D vectors and will walk you through several real-world usage examples. You may recognize our old friend here - a vector. We have other tools which are easier to understand and use. 2D on paper was hard enough, but now, geometry in 3D? Good news: use of trigonometry in graphics is rare and avoided for multitude of reasons. For a beginner, geometry in 3D space may seem a bit daunting.
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