[tranvantrung551987]

hello everyone
I'm studing about function udf in the softwave fluent. Do you know with this chunk code ?. Can you interpret for me all line.
thank you very much !
this chunk code
real hy_get_face_force(int tid1)
{
Thread *t1;
face_t f1;
real force1;
real NV_VEC (A1);

t1 = Lookup_Thread(root_domain, tid1);
force = 0.0;
begin_f_loop (f1, t1)
{
F_AREA (A1, f1, t1);
force1 += F_P (f1, t1) * NV_MAG (A1);
}
end_f_loop (f1, t1)

return force1;
}

[Centurion2011]

try here