This Tut Was Just typed by Me HYDro

Go to ur Opengl.cpp
Look For void APIENTRY pglBegin(unsigned int mode)
and in it place this
Code:
   if(cvar.whitewall)
   {
      if(mode == GL_POLYGON)
         glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_DECAL);
   }

now go to your cvar.cpp and out in
REGISTER_CVAR_INT( whitewall ,1)
Now go to you cvar.h and put in
int whitewall;