// ct = col trace
// n = var
ct_nResult += (ct_nResult == 0) * ct_nDist;  //?

result = c_trace(trace_from,trace_to,IGNORE_ME);
if(!result)
{
  distance = vec_dist(trace_from,trace_to);
}
else { distance = result; }

// C-Script
var ct_nResult  = 0;
var ct_nDist = 0;
var ct_nDistD = 2;  // default in ENTITY units
var ct_nMode = 0;
//...
// set ct_nMode ?
vec_set(temp, my.x);
ct_nDist = (my.max_z - my.min_z) * ct_nDistD;
temp.z -= ct_nDist;
ct_nResult = c_trace(my.x, temp, ct_nMode);
ct_nResult += (ct_nResult == 0) * ct_nDist;	// without if construct

distance = c_trace(trace_from, trace_to, trace_mode);
distance += (distance == 0) * vec_dist(trace_from, trace_to);  // wasteful