3D lighting file used by VRAD, a command line program that adds light properties to a .BSP first-person shooter game map file; stores lighting properties for materials, which define the surface appearance of 3D objects.
RAD files are specified in an XML format. They can include settings for normal LDR and HDR (high dynamic range) color and intensity.
To compile lighting properties into an existing BSP map file, use the following command: vrad -lights bspmapname.rad
Configuration file used by Citrix XenApp (formerly Citrix Presentation Server) virtualization software; saved in a plain text format and contains a reference to a hosted application profile; used for launching streamed applications, which provide software to users on demand.
RAD files are opened automatically by the Raderun.exe program included with XenApp. This program can also be run manually at the command line.
Scene file used by Radiance, a free ray tracing application; saves objects, materials, and lighting properties; serves as an input for generating an octree (.OCT) file so the scene can be rendered.
RAD files are saved in a text format, so they can be edited easily with a text editor before being converted for rendering.