$constantdirectionallight
From Valve Developer Community
If set, constdirectionallightdot
is used to calculate light intensity rather than the normal directional dot product. Only valid if STUDIOHDR_FLAGS_STATIC_PROP
($staticprop
) is also set.

Syntax
$constantdirectionallight <scale>
Example
$modelname props_foliage\hedge_256_128high.mdl $body "Body" "hedge_256_128high_reference.smd" $staticprop $constantdirectionallight 0.15 $surfaceprop "wood_solid"