Shield Interception Tag Use

Shield Interception Tags

The two following tags can be used to control what types of shields can intercept what types of weapons:

InterceptedByShieldType: This is defined in the weapon that is to be intercepted. It represents a bitfield that is checked against a similar bitfield on the shield for a positive or negative interception (see examples).

ShieldInterceptType: This is defined in the shield. It represents a bitfield that is checked against a similar bitfield on the weapon to determine a positive or negative interception (see examples).

Examples

In order to check for shield collisions, the two tags above are converted into binary format, for example:

InterceptedByShieldType=5; becomes 101 in binary
ShieldInterceptType=7; becomes 111 in binary

To then check that weapon's interception status against the shield, the bitfields need to be lined up as follows:

101 (Weapon)
111 (Shield)

If any of the columns made by this line-up contains two ones, the shield will positively intercept the weapon. In this case there are two columns with two ones in them, so the weapon is intercepted. A final example:

InterceptedByShieldType=7; becomes 111 in binary
ShieldInterceptType=24; becomes 11000 in binary

00111 (Weapon)
11000 (Shield)

No interception is registered because no columns contain two ones.

Charts

I (Relinquished) felt that it may help some people to have a few charts or reference tables to quickly see which shields work with what.

Table of Shield type hit detections (X's indicate a collision)

Collision Chart

Binary Collision Shield Groups

1 2 4 8 16 32 Are the only 6 possible distinct shield groups.

Anything in each of the following categories will collide with any other one in the same category:

000001 Shields:
	1	3	5	7	9
	11	13	15	17	19
	21	23	25	27	29
	31

000010 Shields:
	2	3	6	7	10
	11	14	15	18	19
	22	23	26	27	30
	31

000100 Shields:
	4	5	6	7	12
	13	14	15	20	21
	22	23	28	29	30
	31

001000 Shields:
	8	9	10	11	12
	13	14	15	24	25
	26	27	28	29	30
	31

010000 Shields:
	16	17	18	19	20
	21	22	23	24	25
	26	27	28	29	30
	31

100000 Shields:
	32