Occlusion Pre-Pass

I implemented Occlusion Pre-Pass: ambient occlusion(AO) and directional occlusion (DO).
This idea is based on Light Pre-Pass.
I render boundary mesh in order to find screen space pixels.

Implemented occlusion types are the following:

• Sphere AO
• Tube AO
• Disk AO
• Sphere DO
• Tube DO
• Disk DO (remain incomplete)




without occlusion





with AO



with AO+DO

 

 



result

References:
[1]SphereAO [http://www.iquilezles.org/www/articles/sphereao/sphereao.htm]
[2]Lighting Technology of ”The Last of Us”. SIGGRAPH 2013