Mat hdr enabled/en
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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.
