Yes, but no... sorry I found... you must see the file:
ZzzEffectNoUse.cpp (original source not louis version modified):
void RenderFog(vec3_t Position,int Flag,float Height,float u,float v)
{
float UV[4][2];
TEXCOORD(UV[0],0.f+u,0.f-v);
TEXCOORD(UV[1],0.f+u,2.f-v)...