rasterointiprosessia

Rasterointiprosessi, also known as rasterization, is a fundamental process in computer graphics used to convert vector graphics into raster graphics, or bitmap images. Vector graphics are defined by mathematical equations representing lines, curves, and shapes, while raster graphics are composed of a grid of pixels. Rasterization's primary role is to determine which pixels on the screen or in the image should be illuminated and what color they should be to accurately represent the underlying vector data.

The process typically involves several stages. First, geometric primitives such as lines, triangles, or polygons are transformed into a viewable space, often a 2D projection. Then, these transformed primitives are clipped to ensure they are within the boundaries of the rendering area. The core of rasterization involves determining which pixels are covered by each primitive. For triangles, this often involves checking if a pixel's center lies within the triangle's boundaries using barycentric coordinates or other methods. Once a pixel is identified as being covered, its color is determined. This color can be a solid color, or it can be interpolated across the primitive based on vertex attributes like color, texture coordinates, or normals. Shading models are then applied to calculate the final pixel color, incorporating factors like lighting and texture mapping. This pixel-by-pixel calculation is what transforms the smooth, scalable vector data into the discrete, fixed-resolution pixel grid of a raster image.