> Could you share this "hack"?

Comment out this conditional part from do_phong

if (Cos_Angle_Of_Incidence > 0.0)
  {
  }

If you look near the top of lighting.c, you'll notice that phong,
specular, and other functions execute if the object bears the
double_illuminate flag, the highlights are just skipped inside each
function if the light is behind the point.

-Mike

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