mat_hdr_enabled
mat_hdr_enabled
is a console variable available in all Source games.
This command is used to enable or disable HDR lighting. This command is not available in Left 4 Dead engine branch or above (except in
Portal 2, despite all Portal 2 maps are not compiled with LDR lighting).
If set to 0, disable HDR completely.
If set to 1, LDR (SDR) with Bloom is enabled.
If set to 2, HDR is enabled.