VRAD (Source 2)
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VRAD3 is the command-line tool that calculates and embeds lighting data into compiled maps. It is the 
Source 2 counterpart of 
Source 1's VRAD.
Earlier Source 2 games use VRAD2 to preview baked lighting in Hammer.
In 
Counter-Strike 2, VRAD3 now requires a GPU with ray tracing support (NVIDIA RTX, Intel Arc or AMD Radeon 6xxx+ series) to both preview and bake lighting[confirm]. VRAD2 and the old CPU lighting compiler have been removed.
Todo: Add more information about Source 2's VRAD2/VRAD3 lighting.
