thats what lua scripts are for
Falling particles make some pressure
Pressure can give small velocity to particles
Problem solved with vsns or whatever the #### you use to measure velocity of a particle
Just use PHOT
I think he means the wavelength of the PHOT,which can be read with DTEC.
but it has no wavelength, and messes up electronics
use GRVT with TMP of 1, which i dont know how you can make it actually you can, throw a phot at TEMP 0 gpmp and voila you have GRVT with TMP of 1