sebastianhein/urp-ssao

Screen Space Ambient Occlusion implementation as a RendererFeature for Universal Render Pipeline

URP Screen Space Ambient Occlusion Renderer Feature

This is a sample implementation for SSAO as a RendererFeature in URP. The shader is highly based on this blog post. This has been created for educational purposes, not for production.

Developed and tested on:

• Unity 2019.3.2f1
• Universal RP 7.1.8
• OSX 10.14

This is how it looks:

Debug mode

SSAO active

SSAO inactive

Usage

• create or open a URP project
• open "Package Manager"
• click on the "+" icon on the top right
• "Add package from git URL"
• paste "https://github.com/sebastianhein/urp-ssao.git" into the input field
• add new SSAO RendererFeature to the URP settings
• "depth texture" must be enabled in the URP settings

Known issues/TODOs:

• HDR doesn't work, the SSAO effect uses RGBA32 rendertexture. Needs a check if the current camera target is HDR enabled.

urp-ssao's Issues

It doesnt work on play mode :/

Unity Version: 2019.3.0b12
URP: 7.1.5

The second one is in playing mode. Issue is SSAOmaterial is null in Execute method in playing mode.

found error in ssao:

Watch out, there is an error in the ssao.shader inside the frag() function:

float3 random = normalize( tex2D(_RandomTexture, input.uv * 4.123).rgb );
This has range of [0, 1]

You need to expand the range to [-1,1] which is what the original post contained, like so:

float3 random = tex2D(_RandomTexture, input.uv).rgb;
random = normalize(random*2-1); //NOTICE: normalize AFTER the expansion.

You also need to ensure your texture contains RGB color noise (not black-and-white monochrome)