Alpha to coverage

Alpha to coverage is a multisampling technique used to render dense foliage or grass using partially transparent textures ^[1] .

Alpha to coverage interprets the transparency obtained from the alpha channel of the texture (the Alpha ) as the number of subpixels covered by a partially transparent object (the Coverage ). Like Alpha testing, this technique does not require pre-sorting of textured polygons, but gives a higher image quality due to multi-level transparency (Alpha testing uses only two levels of transparency).