#define MOVE_NOTHING -1
entity WarpZone_trace_forent; // temp, callback is allowed to change it
-typedef void(vector start, vector hit, vector end) WarpZone_trace_callback_t; // called on every elementary trace
+USING(WarpZone_trace_callback_t, void(vector start, vector hit, vector end)); // called on every elementary trace
var WarpZone_trace_callback_t WarpZone_trace_callback_t_null;
entity WarpZone_trace_transform; // transform accumulator during a trace
entity WarpZone_trace_firstzone; // first warpzone hit by a trace (can differ from the requested zone in case of _ThroughZone, the trace is aborted then)