thx i tried somthing else

from

c_trace(my.x,vector(my.x,my.y,my.z-100),use_box && get_hitvertex);
to
c_trace(my.x,vector(my.x,my.y,(my.z-100)),ignore_me | get_hitvertex);

now it works
i think its the use_box
it wasnt ignore_me
thx all

"empty"