Not sure what the question and I am not sure how exactly the mechanics are coded but I will try to explain the best way I can.
Lets a weapons fire at vehicles:
1) A "dice" it rolled to check if the weapon has scored a hit.
2) If the weapons misses a dice is rolled to determine angular scatter and another linear.
3) Then there is a collision hit check, to see if the projectile score a "collision" hit.
4) If the projectile scored either a "natural" hit or a "collision" hit another dice is role to check if the weapon penetrated or not.
