Here's a quote from a useful document I wrote a while ago that may or may not help to clear things up for you:
View PostThe Complete Guide to Submunitions said:
Proximity to Target:
Submunitions will not appear unless their parent shot detonates at some distance from whatever they hit. Therefore, a weapon with a ProxRadius of 0 will not produce any submunitions on impact. Also, Point Defense weapons impacting Guided weapons cannot produce submunitions, as PD-Guidance collisions do not use proximity fuses.
It seems that the parent shot needs to explode at least at the edge of the target ship (in order to generate submunitions). I am not certain just how ProxRadius impacts are calculated, but I think I recall a statement that (ProxRadius) needs to be around 40 in order (for submunitions) to work properly with most ships in Nova. What I have tested is that 10 works about 80% of the time on a squarish ship 40 pixels on a side.
On the topic of asteroid collisions, what's the ProxRadius for the weapon when it fails to launch submunitions when hitting an asteroid, and how far away from the asteroid does it explode?
Edwards