Made a custom ReShade preset with ray tracing for my first Black Mesa play through. Black Mesa ReShade using Pascal Gilcher Ray Tracing shader using the following ReShade effects. Thank you and hope you enjoy the mod.

ReVeil Top
MXAO
RTGlobalIllumination
Screen Space Reflections
ReVeil Bottom
SMAA
FXAA
Filmic Anamorphic Sharpen
Ambient Light
Colourfulness
Deband

NOTES:
1. This was made using RTGI 0.23 and ReSahde 4.9.
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.
5. Make sure to disable Anti-Aliasing in the in-game options. Also, I would recommend turning off screen space reflections within ReShade for outdoor Earth scenes.


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


TROUBLESHOOTING:
1. If ReShade does not load when starting the game find the d3d9.dll file in the Black Mesa directory and move it into the bin folder and it should work.
2. If the RTGlobalIllimination plugin is not visible within ReShade then it is not installed correctly.
3. Most common issue with RTGI not working once installed are the ReShade depth buffer settings.
4. Make sure to disable Anti-Aliasing in the in-game options. Also, I would recommend turning off screen space reflections when outdoors on Earth for better immersion.
5. Lastly, check this mods Posts tab for troubleshooting tips.

My Portal 2 ReShade

My YouTube channel