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Rasterisation (or rasterization) is the task of taking an image described in a vector graphics format (shapes) and converting it into a raster image (pixels or dots). The rasterised image may then be displayed on a video display or printer, or stored in a bitmap file format. Rasterisation may refer to either the conversion of models into raster files, or the conversion of 2D rendering primitives such as polygons or line segments into a rasterized format.
Rasterisation of 3D images
Compared with other rendering techniques such as ray tracing, rasterisation is extremely fast. However, rasterization is simply the process of computing the mapping from scene geometry to pixels and does not prescribe a particular way to compute the color of those pixels. Shading, including programmable shading, may be based on physical light transport, or artistic intent.
The process of rasterising 3D models onto a 2D plane for display on a computer screen ("screen space") is often carried out by fixed function hardware within the graphics pipeline. This is because there is no motivation for modifying the techniques for rasterisation used at render time[clarification needed] and a special-purpose system allows for high efficiency.
- Image tracing
- Hidden surface determination
- Bresenham's line algorithm for a typical method in rasterisation
- Scanline rendering for line-by-line rasterisation
- Rendering (computer graphics) for more general information
- Graphics pipeline for rasterisation in commodity graphics hardware
- Raster image processor for 2D rasterisation in printing systems
- Vector graphics for the source art
- Raster graphics for the result
- Raster to vector for conversion in the opposite direction
- Triangulated irregular network, a vector source for topography data, often rasterized as a (raster) digital elevation model.
- Display list