...
	while(me)
	{
		...
		
		//calculate 'START-of-trace' vectors
		vec_set(s_leftV, vector(0,0, my.min_z));		//local co-ord of feet
		vec_rotate(s_leftV, my.pan);						//rotate to players facing direction
		vec_add(s_leftV, my.x);								//position 'around' player
	
		vec_set(s_backV, vector(0,0, my.min_z));		//local co-ord of feet
		vec_rotate(s_backV, my.pan);						//rotate to players facing direction
		vec_add(s_backV, my.x);								//position 'around' player
	
		vec_set(s_rightV, vector(0,0, my.min_z));		//local co-ord of feet
		vec_rotate(s_rightV, my.pan);						//rotate to players facing direction
		vec_add(s_rightV, my.x);							//position 'around' player
	
		//
		//calculate 'END-of-trace' vectors
		vec_set(e_leftV, vector(0,-500, my.min_z));	//trace distances (from feet)
		vec_rotate(e_leftV, my.pan);						//rotate to players facing direction
		vec_add(e_leftV, my.x);								//position 'around' player
		
		vec_set(e_backV, vector(-500,0, my.min_z));	//trace distances (from feet)
		vec_rotate(e_backV, my.pan);						//rotate to players facing direction
		vec_add(e_leftV, my.x);								//position 'around' player
		
		vec_set(e_rightV, vector(0,500, my.min_z));	//trace distances (from feet)
		vec_rotate(e_rightV, my.pan);						//rotate to players facing direction
		vec_add(e_leftV, my.x);								//position 'around' player
	
	
		c_trace(s_leftV, e_leftV, IGNORE_ME);			/*	debugging --> */	draw_line3d(s_leftV, NULL, 100);	draw_line3d(e_leftV.x, vector(0,255,0), 100);
	
		c_trace(s_backV, e_backV, IGNORE_ME);			/*	debugging --> */	draw_line3d(s_backV, NULL, 100);	draw_line3d(e_backV.x, vector(0,0,255), 100);
	
		c_trace(s_rightV, e_rightV, IGNORE_ME);		/*	debugging --> */	draw_line3d(s_rightV, NULL, 100);	draw_line3d(e_rightV.x, vector(255,0,0), 100);
		//
		//
		wait(1);
	}
...