I have seen planned traces of -999999, but if that is absurd, it is well placed here.

Instead of hard coded amounts, trace distances can be based on the actors size, min_z, max_z - min_z, etc. multiples.

Ignore this. It is erroneous.:
Code:
// ct = col trace
// n = var
ct_nResult += (ct_nResult == 0) * ct_nDist;  //?