SSAO with depth cutoff parameter

Hi there,
I had artifacts on far away geometry, so I added a depth cutoff parameter to the standard ssao shader.

Have fun.
Ciao, Patrick

[edit]
Before importing this package, check if you have the standard SSAO effect files in your project.
- Standard Assets\Image Effects (Pro Only)\SsaoEffect.cs
- Standard Assets\Image Effects (Pro Only)\_Sources\Shaders\SSAOShader.shader
- Standard Assets\Image Effects (Pro Only)\_Sources\Shaders\frag_ao.cginc
Please remove these before importing the package, otherwise unity will report a problem with the script name.

 

Wow thanks man, this is exactly what I was needing.

 

Awesome! Thanks Hightree. Found a bug in your SSAO script. The filename of the script needs to be changed to be the same as the class name or it fails to compile.

 

If you're getting an error with the class name, try importing into an empty project or verify that you don't have a SSAOEffect.cs script in your project already.

 

This could be VERY useful! I love the look of SSAO, but not how it would behave with fog. Sounds like this will avoid that problem entirely huh? Awesome, thank you!!!

 

Very nice, thanks for sharing!

 

Great idea, but it does not work "Can't add script" error, always says it hasnt finished compilation and unity has been open for 7 hours

 

IIRC you need to edit something in it to get it to work properly?

 

As I posted before, this script name problem pops up if you already have the standard ssao effect in your project.
Try removing it before importing the package.

 

This works flawlessly for me. I was having some major problems with blackness on terrain, but this allows somewhat of a fix. Thanks.

 

I have uploaded another SSAO script based on what you created with the cutoff parameter. The cutoff parameter is out of the picture and I added an extra parameter which sets the fog density to the shader.

The fog density uses the exp2 formula from DirectX. The other functions are not implemented, but it could be done very easily (The linear and the exp).

 

is it working in 3.4?

 

Yes it is. I've built and tested the small example scene in 3.4.

 

Thanks, works fine on OS-X too. The original one was way too buggy to implement, but yours works fine.
Doesn't cut off as much of the framerate as the original script either, 60 vs 80FPS.

 

Great stuff guys, this should replace the original SSAO script of Unity IMHO.

 

I've heard that the new Unity 3.5 solves these issues and SSAO is rebuilt by the Unity team. It then also supports alpha blended particles to occlude SSAO. In other words: It solves this issue: http://answers.unity3d.com/questions/24974/problem-with-ssao-and-particle.html.

 

Although it's been two years, who could be useful.
"SSAO with exp2 fog" noticeably slower than "original SSAO".
But it can be fixed - frag_ao.cginc need to replace the lines:

Code (csharp):

1. float fogFactor = (1-(1/exp((normalizedDepth * 100 * _FogDensity)*(normalizedDepth * 100 * _FogDensity))));
2. return saturate( (1-occ) + fogFactor );

by this line:

Code (csharp):

1. return saturate( (1-occ) + (1-(1.07/exp2((normalizedDepth * 100 * _FogDensity)))) );

 

Refreshing again, there are problems in unity 5 with fog and ambient occlusion which draws occlusion over it.
Global fog solves this problem but global fog don't affect billboard trees on terrain (there is no TreeBillboard shader in project and anything like this, I think trees use default).

I want to use shaders posted there but unity gives error: "Shader error in 'Hidden/SSAO': 'samples': array dimensions of function parameters must be explicit at Assets/SSAO with exp2 fog/frag_ao.cginc(2) (on d3d11)"

Don't know how to repair this.

Edit:
Ok I analyzed both shaders and I edited current SSAO shader from unity 5 and now it works.
Just added cutoff variable in SSAOShader.shader file.
To frag_ao added

Code (CSharp):

1. return (depth > _DepthCutoff) ? 1f : (1-occ);

on the end return, and updated editor script for camera to controll cutoff.