Some testing of Raytraced shadows and AO

[hallatore]

I only have a 1080 TI, so I wanted to see what could be achieved with as little RT stuff as possible. Here are what I ended up with so far.
I'm quite pleased with the results by just using Ray traced shadows for the sun, and ray traced AO on the post process volume. I also like the trick of using a skylight but turning of shadows for it.

Before/after images. (You can switch between Off, Shadows and Shadows+AO)

• https://imgsli.com/MzI3NQ/0/2
• https://imgsli.com/MzI4MA/0/2
• https://imgsli.com/MzI3OQ/0/2
• https://imgsli.com/MzI3OA/0/2
• https://imgsli.com/MzI3Nw/0/2
• https://imgsli.com/MzI3Ng/0/2

Some notes/settings

• r.RayTracing.Reflections is on by default. Disable it if you're not using it. (It took quite a bit of fps while doing nothing in my scene)
• I enabled r.RayTracing.Shadows and r.RayTracing.AmbientOcclusion
• On the skylight i turned off "Cast Shadows" (I let the post process RT AO handle it)
• For this scene I set the Post process volume Ambient Occlusion intensity to 1 and samples per pixels to 3.
• Since Ray tracing is mostly a per-pixel-cost, you get nice results "at any distance" like in this picture: https://imgsli.com/MzI3Ng/0/2

[hallatore]

Some comparisons of default and RT shadows and AO: https://imgsli.com/MzI4Nw/1/4

If you like the smoother edges of CSM shadows you can adjust the Source Angle of RT shadows to make them softer: https://imgsli.com/MzI4OQ