May be easily integrated into any modern graphics pipeline.No CPU usage вЂ“ it can be executed completely on the GPU.

Works in the same consistent way for every pixel on the screen.No data pre-processing needed, no loading time and no memory allocations in system memory.Such a solution allows a reduction in the number of depth samples per pixel to about 16 or fewer while maintaining a high quality result, and allows the use of SSAO in soft real-time applications like computer games.Д¬ompared to other ambient occlusion solutions, SSAO has the following advantages: In the end this high frequency noise is greatly removed by a Nx N post-process blurring step taking into account depth discontinuities (using methods such as comparing adjacent normals and depths). The kernel orientation is repeated every N screen pixels in order to have only high-frequency noise in the final picture. In order to get high quality results with far fewer reads, sampling is performed using a randomly rotated kernel. This is not acceptable for real-time rendering on current graphics hardware. Without additional smart solutions, such a brute force method would require about 200 texture reads per pixel for good visual quality. In its simplest implementation, the occlusion factor depends only on the depth difference between sampled point and current point. For every pixel on the screen, the pixel shader samples the depth values around the current pixel and tries to compute the amount of occlusion from each of the sampled points. The algorithm is implemented as a pixel shader, analyzing the scene depth buffer which is stored in a texture.

Ssao on vs off