Contour-based polygonal ambient occlusion using a single-depth texture

摘要

We present a novel approximation of a global illumination technique called contour-based polygonal ambient occlusion, an approach that darkens by only using a depth texture as screen-space ambient occlusion without additional information such as a normal buffer. We introduce a discrete level structure to calculate the amount of occlusion by using the contour level, an integer value derived from the depth difference of neighboring texels. We use the uniform sampling to define the positions of the neighboring texels in the depth texture. Our method does not depend on geometric complexity because our method works in screen space and works well for both static and dynamic scenes without any precomputation. Copyright (c) 2013 John Wiley & Sons, Ltd.