For a beginner, geometry in 3D space may seem a bit daunting. 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. We have other tools which are easier to understand and use. You may recognize our old friend here - a vector.
This article will introduce you to 3D vectors and will walk you through several real-world usage examples. Even though it focuses on 3D, most things explained here also work for 2D. Article assumes familiarity with algebra and geometry, some programming language …