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Old 09-12-2019, 06:17 AM   #1
Scolop
 
Join Date: Jul 2015
Default Rounding DR and AD

A piece of armor has 5 DR. It gets hit by a cutting attack with Armor Divisor 2. Which one of those is true:

- DR is dropped to 2. Edge Protection is up to 4.
- DR is dropped to 2.5, which will eventually be rounded down. Edge Protection is 5.

I'm pretty sure the first option is right. Just checking to see if I need to make a house rule out of the second option and give armor a little bit more of an edge (protection. Pun intended).
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Old 09-12-2019, 06:49 AM   #2
Anders
 
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Default Re: Rounding DR and AD

I go with DR 3 and EP 5. Everything in GURPS is rounded up unless otherwise specified. But I would multiply DR by 2 before rounding, if that makes sense.
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Old 09-12-2019, 06:50 AM   #3
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Default Re: Rounding DR and AD

Basic pg 378 would seem to agree with you. "round DR down"
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Old 09-12-2019, 07:11 AM   #4
Anders
 
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Default Re: Rounding DR and AD

Hmm. Well, what do you know. I stand corrected.

In that case I would go with DR 2 and EP 5.
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Old 09-12-2019, 08:04 AM   #5
Anaraxes
 
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Default Re: Rounding DR and AD

Rounding is the last step. Do all the math in full, then round.
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Old 09-13-2019, 01:33 PM   #6
Plane
 
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Default Re: Rounding DR and AD

I don't recognize the expression 'edge protection', does that have something to do with that rule somewhere about armor converting some amount beyond its DR of cutting damage into crushing for its wearer? I can't remember where I saw that before, one of the low-techs I think
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Old 09-13-2019, 02:13 PM   #7
Anders
 
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Default Re: Rounding DR and AD

Yeah, Low-Tech in the armor chapter.
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Old 09-13-2019, 02:56 PM   #8
Anthony
 
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Default Re: Rounding DR and AD

Honestly, I would treat this as DR 5 (no EP); making your blade sharper doesn't increase the amount of crushing damage it does.

EP in general is a clunky mechanic that only exists because fixing the problem properly is politically infeasible; it's just blunt trauma, reworked because the blunt trauma rules were really designed for guns and don't produce sane results for melee weapons.
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Old 09-13-2019, 07:57 PM   #9
Plane
 
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Default Re: Rounding DR and AD

Ah, found it with fresh eyes, 102, "Blunt Armor and Edged Weapons"

So is "Edge Protection" a fan term for the "at least 1 point of penetrating damage past twice the armor’s DR" threshold or did it start getting used somewhere?
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Old 09-13-2019, 08:13 PM   #10
Anaraxes
 
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Default Re: Rounding DR and AD

The phrase goes back a long way. I think it originally came from TBone's house rules.

(See, for example, the 2007 thread http://forums.sjgames.com/showthread.php?t=24016.)
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