Signed Distance Field Technique
【 Distance Field Technique 】 一种小纹理高清放大的技术。 A distance field is generated from a high resolution image, and then stored into a channel of a lower-resolution texture. which has been previously used to develop games such as the Half- Life 2 series, Counter-Strike: Source and Day of Defeat: Source. In the simplest case, this texture can then be rendered simply by using the alpha-testing and alpha-thresholding feature of modern GPUs. The distance function stored in an 8-bit channel. By doing so, we are able to take advantage of the native bilinear texture interpolation. Once