What rasterization is
Rasterization is the process of taking shapes described by geometry, such as the outlines and surfaces of objects, and converting them into a raster image made of pixels. A screen displays images as a grid of pixels, so graphics that are defined mathematically must be turned into this pixel form to be shown. Rasterization performs that conversion, mapping shapes onto the pixel grid.
From shapes to pixels
Graphics are often described in terms of geometry, like points, lines, and polygons that define the shapes of objects. These descriptions are precise but not yet in a form a screen can display directly. Rasterization bridges this by determining which pixels are covered by each shape and filling them in accordingly. The result is an image composed of pixels that approximates the original geometry.
Why rasterization is used
Rasterization is widely used because it is an efficient way to produce images from geometric descriptions. By systematically figuring out which pixels belong to which shapes, it can generate images quickly. This speed makes rasterization especially suitable for situations where many images must be produced rapidly, such as interactive graphics that update continuously in real time.
Rasterization and real-time graphics
Because rasterization is fast, it is a common technique in real-time graphics, where images need to be generated many times per second. The efficiency of turning geometry into pixels on the fly makes it well suited to interactive applications. This is a major reason rasterization has long been a foundational method in rendering graphics on screens.
Rasterization in the pipeline
In the process of rendering graphics, rasterization is a key stage that converts the geometric representation of a scene into the pixel image that is ultimately shown. Other steps may come before and after, but rasterization is the point at which shapes become pixels. Understanding it clarifies how described geometry becomes the picture you see on a display.
Why it matters
Rasterization is a fundamental technique in computer graphics. Understanding what it is - converting geometric shapes into a grid of pixels - clarifies how images are produced for screens. For anyone interested in how computer graphics work, it is a valuable concept to understand.
Related on Skillo
See also: What is a pixel? Explained, What is a GPU and why gamers care.
Sources
Published date reflects the original event date (2026-09-01). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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