Shadow maps are a widely used shadowing technique but the drawback is that they cannot be filtered in the same way as color textures, typically leading to severe aliasing. Variance shadow maps is an algorithm that approximates the occlusion by using the variance of depths over any filter region. This solves the problem of shadow map aliasing with minimal additional storage and computation. The OpenGL API-based demo with source requires EXT_framebuffer_object support.
May 02, 2006 | Category: Developers •