The aim of Black Mesa: HECU is to provide a completely new experience that fills in the narrative spaces left by the military during Black Mesa incident... very much how Opposing Force did in its heyday.
It looks like you are using -realskylight to have ambient sky light. This param. only for xen levels initially, it doesn't looks good with earthbound outdoor levels due to brightness, add -realskylightscale 0.2 to have more accurate ambient sky light in your earthbound outdoor levels.
Amazing stuff!
Fantastic additions and enhancements... A lovely screenshot.
It looks like you are using -realskylight to have ambient sky light. This param. only for xen levels initially, it doesn't looks good with earthbound outdoor levels due to brightness, add -realskylightscale 0.2 to have more accurate ambient sky light in your earthbound outdoor levels.