I got it to work!

Thank you very, very much. The player can now hide behind the sun, without being target-able (is that even a word?).
Awesome License :P... never heard of that one before. Had to google it first.

I really missed "ll_sphere3d_initialize"
and "ll_line3d_initialize"
functions... it took me a while to understand that I can't do line.from = ll_vector3d_1; because the from and to in the ll_line3d aren't pointers...

also, this gives me a "wrong number/type of parameters":
vec_set(temp,vector(sunEnt.x,sunEnt.y,sunEnt.z));
ll_vec3d_set(ll_sunPos,temp);
even though I did
#define acknex_h
and have acknex.h included.
What's wrong with my code there?