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Alpha to coverage
View on Wikipedia | This article needs additional citations for verification. (February 2013) |
Alpha to coverage[1][2][3] is a multisampling computer graphics technique, that replaces alpha blending with a coverage mask. This achieves order-independent transparency for when anti-aliasing or semi-transparent textures are used. This particular technique is useful for situations where dense foliage or grass must be rendered in a video game.[4]
Alpha to coverage is a sub-pixel version of screen-door transparency, a technique which uses a dithering pattern to simulate transparency with only fully opaque and fully transparent pixels.[5]
Alpha to coverage multisampling is based on regular multisampling, except that the alpha coverage mask is ANDed with the multisample mask. Alpha-to-coverage converts the alpha component output from the pixel shader to a coverage mask. When the multisampling is applied each output fragment gets a transparency of 0 or 1 depending on alpha coverage and the multisampling result.
See also
[edit]References
[edit]- ^ Golus, Ben (21 October 2021). "Anti-aliased Alpha Test: The Esoteric Alpha To Coverage". Medium.[better source needed]
- ^ "Alpha to coverage | Semantic Scholar".
- ^ "Common Rendering Mistakes: How to Find Them and How to Fix Them | Oculus".
- ^ "Configuring Blending Functionality (Windows)". Microsoft Developer Network. Retrieved 2013-01-27.
Alpha-to-coverage is a multisampling technique that is most useful for situations such as dense foliage where there are several overlapping polygons that use alpha transparency to define edges within the surface
- ^ Enderton, E; Sintorn, E; Shirley, P; Luebke, D (2011). "Stochastic Transparency" (PDF). IEEE Transactions on Visualization and Computer Graphics. 17 (8): 1036–1047. doi:10.1109/TVCG.2010.123. ISSN 1077-2626.
External links
[edit]- GPU Gems 3 ‒ Chapter 4. Next-Generation SpeedTree Rendering
- Street Fighter IV PC explained in detail
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