Made a custom ReShade preset with ray tracing for my recent Portal 2 play through
using Pascal Gilcher Ray Tracing shader. Used the following ReShade
effects in order:

ReVeil_Top
MXAO
RTGlobalIllumination
SSR
ReVeil_Bottom
SMAA
FXAA
FilmicAnamorphSharpen,
AmbientLight
Colourfulness
Tint
Levels
Deband


NOTES:
1. I recommend using RTGI version 0.23. Versions 0.24 and after do not seem to work. (This may work with later versions now but I haven't tried.)
2. This mod does not contain the RTGI plugin files. You will need to procure those on your own.
3. RTGI plugin is made by Pascal Gilcher and can be found here.
4. ReShade can be found here.


INSTALLATION:
Install ReShade to the Portal 2 exe (portal2.exe) and check all all effects.
Next install the RTGI shaders by dropping them into the "reshade-shaders" folder.
Drop the preset ini file into the same folder ReShade is installed in (should be "/portal 2/bin".
Start Portal 2.
Press Home to open ReShade then load the preset from the drop down.
Be sure to disable Anti-Aliasing in the in-game options in order for RTX to work.


TROUBLESHOOTING:
If the RTGlobalIllimination plugin is not visible within ReShade then it is not installed correctly.
Most common issue with RTGI not working once installed are the ReShade depth buffer settings.