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Computer graphics lighting is the collection of techniques used to simulate light in computer graphics scenes. While lighting techniques offer flexibility in the level of detail and functionality available, they also operate at different levels of computational demand and complexity.
Bloom lighting has been used in many games, modifications and game engines such as Quake Live, Cube 2: Sauerbraten and the Spring game engine. The effect was popular in 7th-generation games, [9] which were released from 2005 through to the early 2010s. Several games from the period have received criticism for overuse of the technique.
Overlay combines Multiply and Screen blend modes. [4] Where the base layer is light, the top layer becomes lighter; where the base layer is dark, the top becomes darker; where the base layer is mid grey, the top is unaffected. An overlay with the same picture looks like an S-curve.
In computing, hardware overlay, a type of video overlay, provides a method of rendering an image to a display screen with a dedicated memory buffer inside computer video hardware. The technique aims to improve the display of a fast-moving video image — such as a computer game , a DVD , or the signal from a TV card .
When creating lightmaps, any lighting model may be used, because the lighting is entirely precomputed and real-time performance is not always a necessity. A variety of techniques including ambient occlusion , direct lighting with sampled shadow edges, and full radiosity [ 4 ] bounce light solutions are typically used.
In computer graphics, spectral rendering is a technique in which a scene's light transport is modeled with real wavelengths. This process is typically slower than traditional rendering, which renders the scene in its red, green, and blue components and then overlays the images.