mapnik/mapnik — comment on commit 2fadf1f2d333f6f4d472c9510bc70f261c4e7fab
File: include/mapnik/ctrans.hpp line 83
By xificurk:

Correct me if I'm wrong. My assumption was that all geometries are 2D, so z should remain zero, therefore there is no need to reinitialize it in every loop pass.