[Gurps Fan]

Thank you all for replying!

I came to support the view that this question relates to wounding multipliers -- as pointed out by Kraydak and Kromm -- as opposed to HP and DR. The "Homogenous or not?" view is essentially an issue of wounding multipliers, but lacking Homogenous seems to open another can of worms: Do bottles have brain and vitals? Where is the borderline between "*1/5 vs. pi" (Homogenous) and "*1 vs. pi" (lack thereof)? This would be a sudden, big gap.

The simplest way to assign a boosted wounding muliplier is to give Vulnerability disadvantage (p. B161). Vulnerability is a leveled trait (*2/*3/*4), so we can fine-tune the multiplier, e.g., from *0.2 through *0.4 and *0.6 to *0.8 (vs. piercing damage) by combining it with Homogenous, without adding any moving parts or living organs to inanimate objects.

For example, if we assume the glass bottle in question (DR 1 and HP 3; Low-Tech, p. 34) have a Homogenous and Vulnerability (*4; cr, cut, imp and pi), it takes an injury of (9 - DR 1) * 4 (for Vulnerability) * 1/5 (for Homogenous) = 6.4 points. An injury of 6 points is necessary and sufficient to force the said bottle to make a death check.