No dude, make it like this:
Code:
VECTOR end_pos;

vec_set(end_pos,vector(10,0,my.max_z + 10));
vec_rotate(end_pos,my.pan);
vec_add(end_pos,my.x);

c_trace(my.x,end_pos,IGNORE_ME|IGNORE_PASSABLE);
if(trace_hit){/* DON'T JUMP*/}else{/*JUMP*/}
This is not tested, but should give you an idea. This is same as making player climb things, but there you would need second trace from players center.

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