LM_Tool is a community-modified version of Tool which improves the speed of lightmaps generation (radiosity). LM_Tool achieves this by disabling some runtime debug checks present in the official Tool release, and can only be used for radiosity; all other functions are disabled.
Simply download and extract
LM_Tool.exe and place it in Halo's directory where
tool.exe would be found.
LM_Tool is used from the command line in the same way as Tool, just change the EXE name. For example:
LM_Tool.exe lightmaps levels\test\ratrace\ratrace ratrace 1 0.01
See Tool documentation for more details of using and troubleshooting lightmaps.