_tint.vmt

"VertexLitGeneric"
{
// Purpose: sample of dynamic tint HDR Overbright based where the player/entity is looking
  $lighting ".499"

  $MinLighting ".432"
  $MaxLighting ".897"

  $LightBoost ".9"
  $clr ".0"
  $zro ".0"
  $color " [ 1 1 1 ] "

  Proxies
  {

    // Split $color vector otherwise it doesn't work in Gmod
    Clamp 
    {
      srcVar1 $zro
      min "$color[0]"
      max "$color[0]"
      resultVar "$color[0]"
    }
    Clamp 
    {
      srcVar1 $zro
      min "$color[1]"
      max "$color[1]"
      resultVar "$color[1]"
    }
    Clamp 
    {
      srcVar1 $zro
      min "$color[2]"
      max "$color[2]"
      resultVar "$color[2]"
    }

    // drive $lighting
    Pupil
    {
      TextureVar $basetexture
      TextureFrameNumVar $frame
      PupilCloseRate .08
      PupilOpenRate .08
    }

    Subtract
    {
      srcVar1 $LightBoost
      srcVar2 $lighting
      resultVar $clr
    }

    // Clamp for limit and prevent to bright/dark
    Clamp
    {
      min $MinLighting
      max $MaxLighting
      srcVar1 $clr
      resultVar $clr
    }

    // Transfer the calc light from Pupil to $color
    Equals
    {
      srcVar1 $clr
      resultVar "$color[0]"
    }
    Equals
    {
      srcVar1 $clr
      resultVar "$color[1]"
    }
    Equals
    {
      srcVar1 $clr
      resultVar "$color[2]"
    }

  }
}