How would you rule a grenade shock wave rebound in a non-standard room?

How many walls can affect the blast strength?

What about if the grenade exploded in a triangular shaped room?

What about a circular room?

It only matters if the walls are really tough and the room quite small. A conventional construction building will have the walls blown out and the ceiling collapse if you set off an explosive charge in it.

I prefer the "Chunky Salsa" rules. You're in a small room without cover when a grenade goes of and you're not a troll in heavy armor then you should order a shoebox for your remains. I hate excessive math

additionally, if you're experiencing chunky salsa effect, i'd say it's a bit of a moot point whether you take 30 damage or only 20

[edit] drat, beaten to the punch! [/edit]

I rock AND roll

Man, I don't know. The difference between 30 and 20 DV would be pretty big for the troll in my group. He's scored 15 hits on damage resistance before. (To be fair, Edge was involved.)

That said, I'd never spend too much time worrying about the math/geometry of bouncing explosions. I'd make a quick decision about what makes sense, check who dies, and move on. That's mostly because I'm bad at the math stuff, though.

What about multiple gernades or a burst or full auto shot from a auto gernade launcher. Were now seeing shotgun shell sized gernades how about 60 yrs from now. Not to mention the MK19 full auto gernade launcher thats been around for a long time.

In the latter case we treat it as full auto attack with +1 meter per round effect.

If something like that is an issue, I doubt you are still playing Shadowrun.

For those of us who want the RAW to be used *only* for runners of 200-400 BP plus 0-200 Karma, and not, within that, any vehicular combats, nor trolls with full body armor, bone density, and Toughness, nor dragons as published in RAW, nor cyberzombies as published in Augmentation, etc., then sure, you can just say that such situations are "off the map". If the guards use a MK 19 grenade launcher, the GM can rule that the PCs are dead with no saving throw. But then again, flash-bangs are 6S; you really think that ANY target caught in an enclosed space with a flash-bang is auto-insta-killed? Some of the stock characters in BBB might survive and be conscious (although really looking forward to some rest and recovery), if several meters away from the flash-bang.

For those of us who want the rules to be a toolkit, it's interesting to see things scale up and down. Also, for those of us who might ever run an adventure including any of the situations listed above, eg a vehicular combat that involves going through a tunnel. (Bulldog has 24 dice to soak, Citymaster has more.)

I don't think shape would make any difference, other than whether the shockwave has a direction in which it can disperse, or is fully confined. Even within a theoretical perfectly square room, with all doors closed and having exact same qualities as the walls, calculating four reflections is still an approximation of complex phenomena. I'd defer to those with more Demolitions knowlege.