LM_Tool is a community-modified version of H1CE 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.

The updated H1A Tool supports a -noassert flag that, with its other lightmapping optimizations, greatly outperforms LM_Tool and is now the fastest lightmapping solution.


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.