ambient occlusion

bounce light

GTAO implementation based on Asylum Tutorials work here.

Demo here

• horizon sample reuse
• Code cleanup
• Fix loop unroll
• separable blur
• Manually assignable rotation and radius offsets
• expose offset variables explicitly
• toggle normal map / alpha map support
• Use depth texture

Noise

• Disocclusion Blur (https://www.youtube.com/watch?v=3EdE38iRn2A @ 3:08)

Features

• See toystory presentation on sample reuse.
• Manually assignable rotation and radius offsets

Performance Knobs

• option to generate normal / use normal in upscale
• seperable blur
• switch float depth buffer to simpler type
• toggle normal map / alpha map support
• consider a single sample per tap? Reuse horizon?
• merge depth and normal maps?
• improve gpu memory use

More

• expose offset variables explicitly
• Check out https://github.com/MaxwellGengYF/Unity-Ground-Truth-Ambient-Occlusion
• toggle normal map / alpha map support
• http://www.klayge.org/material/4_1/SSGI/SSDO.pdf
• https://80.lv/articles/ssrtgi-toughest-challenge-in-real-time-3d/
• https://www.reddit.com/r/Unity3D/comments/a64ybh/ssil_lighting_in_screen_space/
• https://twitter.com/marcinignac/status/1266307922679775234
• https://github.com/haolange/Unity_ScreenSpaceTechStack

• https://github.com/haolange/Unity_ScreenSpaceTechStack
• https://www.reddit.com/r/Unity3D/comments/a64ybh/ssil_lighting_in_screen_space/
• http://www.klayge.org/material/4_1/SSGI/SSDO.pdf
• https://80.lv/articles/ssrtgi-toughest-challenge-in-real-time-3d/
• https://github.com/MaxwellGengYF/Unity-Ground-Truth-Ambient-Occlusion
• https://github.com/asylum2010/Asylum_Tutorials/blob/master/ShaderTutors/54_GTAO/main.cpp
• https://github.com/asylum2010/Asylum_Tutorials/blob/4f2bc39a8ae69db1ceb59e9a763ef91c7b3dc6de/ShaderTutors/Common/gtaorenderer.cpp
• https://github.com/asylum2010/Asylum_Tutorials/blob/master/Media/ShadersGL/gtao.frag
• https://www.youtube.com/watch?v=mIE3DNbeVvY
• https://www.youtube.com/watch?v=7VPb8mZiIrs
• http://developer.download.nvidia.com/assets/gamedev/files/sdk/11/SSAO11.pdf
• http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.214.6686&rep=rep1&type=pdf
• https://github.com/scanberg/hbao
• http://guitarjawa.net/?page_id=789
• https://docs.nvidia.com/gameworks/content/gameworkslibrary/visualfx/hbao/product.html
• https://developer.download.nvidia.com/presentations/2008/SIGGRAPH/HBAO_SIG08b.pdf
• http://advances.realtimerendering.com/s2010/Ownby,Hall and Hall - Toystory3 (SIGGRAPH 2010 Advanced RealTime Rendering Course).pdf