SSAO Demo (Screen Space Ambient Occlusion)

**Luuk van Venrooij** · 03-06-2010, 08:55 AM

He all,

I have been playing arround with some SSAO shaders I found in this thread over at GameDev:

http://www.gamedev.net/community/for...25&WhichPage=9

I created 2 versions of the shaders. One using a linear depth buffer which is stored in an RGBA texture and one using the conventional depth buffer. This because I was having some problems on older hardware with the normal depth buffer.

There is some room for improvement like using a noise texture instead of calculating it in the shader. The same goes for the sin and cos functions in the sample gathering.

Controls:
-Mouse+WSDA to look arround
-F1 to switch SSAO on an off
-F2 to switch between linear RGGA depth buffer or normal depth buffer
-F3 swith mouse capture on and off

Screenshots:
Here are 2 screenshots with the SSAO turned on and off. No other lighting calculations are done here. These where made on a Geforce 7300 LE 128 mb so don`t take the FPS to serious

.
SSAO on:

SSAO OFF:

Download:
Sourcecode like always is under LGPL.
www.genesisdevice.net/ssao.zip

Chears

Luuk

**jdarling** · 03-06-2010, 12:43 PM

Hey, that's a very noticeable difference. I got the best results with RGBA and SSAO turned ON (of course). The controls are VERY touchy, but I can understand for a demo/sample that was the least of your concerns

.

**chronozphere** · 03-06-2010, 10:24 PM

It runs great on my machine. Thanks for this.

I'm glad there are still members in this community who know how to accomplish advanced graphical effects like these.

I did notice that when changing the camera orientation, the light intensity on some areas suddenly changed. There seems to be some kind of popping effect going on. Also, objects have a "dark glow" around them. I'm not sure whether this is a problem. It could be that about any SSAO implementation has this.

**dazappa** · 04-06-2010, 03:43 AM

10 FPS on my 5+ year old system. I absolutely LOVE the effect though, and turning RGBA on was necessary to make the effect look right.

**virtual** · 04-06-2010, 01:37 PM

in the picture the SSAO looks nice

it doesn't work in my machin CPU : P4 3Ghz ;
RAM : 512Mb ;
GPU : GF5200Fx (256Mb of VRAM);

its weake now days , i know

**chronozphere** · 04-06-2010, 04:27 PM

@Virtual: To run this, you'd need a Geforce 8xxx series card. The rest of your system specs are indeed not that good anymore, but they would be good enough to run the demo.