RAD
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RAD is a collective name for the lighting compilers for multiple engines' map formats. The name comes from 
radiosity lighting; see RAD (technical) for more information.
| Engine | Original official compiler(s) | Modern third-party compilers |
|---|---|---|
 Quake II |
QRAD3 | ArghRad (updated version) RAD (Q2Tools-220, formerly 4RAD) LIGHT (ericw-tools) |
 GoldSrc |
QRAD | HLRAD (ZHLT, VHLT, and derivatives) LIGHT (ericw-tools, experimental) |
 Source |
VRAD | CSTRAD [ Deprecated],  Slammin' Compile Tools
|
 Source 2 |
VRAD2 and VRAD3 | N/A |
Additionally, .rad is used as as the file extension for external texture lighting metadata files used by QRAD, HLRAD, VRAD, and ericw-tools.