Raycasting
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May 1, 2024
Updated June 27, 2025
13 minute read
An Introduction to Raycasting
At its core, raycasting is a fundamental technique in the world of computer graphics that solves a very basic problem: determining what is visible from a specific point of view. Imagine you are standing in a virtual room. To figure out what you see, you can trace imaginary straight lines, or "rays," from your eye through each pixel of your computer screen and out into the 3D scene. The very first object each ray hits is what becomes visible at that pixel. This simple yet powerful idea forms the basis for rendering 3D environments and is a cornerstone concept for anyone interested in graphics programming, game development, or computational imaging.
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