Rasterointiprosessin

Rasterointiprosessi, often translated as rasterization, is a fundamental process in computer graphics. It involves converting vector graphics, which are defined by mathematical equations and geometric primitives like lines and curves, into a raster image. A raster image is composed of a grid of pixels, where each pixel has a specific color value.

The core idea of rasterization is to determine which pixels on the screen are covered by a given vector object. For simple shapes like polygons, this involves iterating through the pixels and checking if their coordinates fall within the boundaries of the polygon. More complex objects and curves are broken down into simpler shapes or approximated by a series of lines and then rasterized.

The process typically involves several stages. First, geometric primitives are transformed into screen space, meaning their coordinates are adjusted to match the resolution and orientation of the display. Then, the rasterizer determines which pixels are affected by these transformed primitives. Finally, for each affected pixel, a color is calculated based on factors such as the object's color, lighting, and any textures applied. This pixel-by-pixel rendering is what ultimately creates the visible image on a display device. Rasterization is a key component in rendering engines for video games, 3D modeling software, and many other visual applications.