This:

cloudpointer.pan=0;
cloudpointer.roll=0;
cloudpointer.tilt=360;

let the clouds always facing the camera,
if you use simple sprites ( image files instead of .mdl files).
f.e:

void cloud_func()
{
my.pan=0;
my.tilt=0;
my.roll=360;
}

void main()
{
load_level("");

ent_create("cloud.png",nullvector,cloud_func);
}