ENTITY* mountain_cube =
{
  type = "NACHT+6.tga";
  flags2 = SKY | CUBE | SHOW;
  layer = 2;
  z = 30; // move 30 pixels upwards
}

ENTITY* mountain2_cube =
{
  type = "skyday+6.tga";
  flags2 = SKY | CUBE | SHOW;
  layer = 2;
  z = 30; // move 30 pixels upwards
}

function change_cubes()
{
sky+=1;
if(sky>1)
sky=0;

if(sky==0)
{
reset(mountain2_cube,CUBE);
reset(mountain2_cube,SKY);
reset(mountain2_cube,SHOW);

set(mountain_cube,CUBE);
set(mountain_cube,SKY);
set(mountain_cube,SHOW);
camera.ambient=-100;
}

if(sky==1)
{
reset(mountain_cube,CUBE);
reset(mountain_cube,SKY);
reset(mountain_cube,SHOW);

set(mountain2_cube,CUBE);
set(mountain2_cube,SKY);
set(mountain2_cube,SHOW);
}
}