Implment Bloom in Thumbnails

[arcandio]

• SSAO works in thumbnails because it's a "render feature" not a "post processes".
• https://discussions.unity.com/t/how-to-get-post-processing-on-camera-render-in-urp/1600652/5
• find a way to get bloom as a "render feature" instead of as a "post process" OR
• find a way to get "post process" effects on Camera.Render() output.

[arcandio]

create a render feature for URP?

• https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@16.0/manual/renderer-features/renderer-feature-full-screen-pass.html
• https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@16.0/manual/post-processing/post-processing-custom-effect-low-code.html
• https://www.cyanilux.com/tutorials/custom-renderer-features/#oncamerasetup