how do I trace in a direction reletive to the players pan?

this is how i'm tracing: but it trases absolutly not reletivly


result = trace(vector(player.x,player.y,player.z - 30),vector(player.x+30,player.y,player.z));
IF (result > 0) { player.force_x = 0;}

vec_set(temp,vector(30,0,0));
vec_rotate(temp,player.pan);
vec_add(temp,player.x);
result = trace(player.x,temp);
IF (result > 0) { player.force_x = 0;}