d20 or OGL Materials and Objects rules: Hardness, Hit Points, etc.

[Zoatebix]

I was wondering if anyone had deconstucted "material science" as presented in the core d20 and d20 modern rules. Has anyone compared the hardnesses and hit-points the rules give to "real world" data? Has anyone come up with a "better" or more complete set of hardnesses and hit points?

Inquiring minds want to know!
-George

 

[Prest0]

If you come up with such a thing, we'd consider publishing it.

 

[tjoneslo]

I know of a few references to things, and depending upon how far from the D20 modern you wanted to go, I could probably generate something. But it would be pretty rough.

The Building Vehicle Statistics has a table to convert mass into hit points.

In the Traveller D20 book, under combat, is a chart to calcuate the Armor Values and Hit Points of various material for cover and demolitions purposes. I think this falls into the OGL material in the book.

The other place I would start would be the Stronghold Builders guide. I know there is a listing of various materials (some fantasy) with their hardness and hit points. None of this is OGL however.

These are the places I'd start were I to build something. But most people don't seem interested.

 

[D_Sinclair]

Alternate Realities Publications has crunched most of the numbers you mentioned. Big Bang: The Mostly Illustrated RPG Guide to Modern Weapons has presented numerous rules modifications for various aspects of modern combat over the last 2 1/2 years. Everything from taking actual firearms performance to properly calculate damage specific to the performance of the firarm and ammunition, to new and relatively simply shotgun rules that accurately model the effects of pellet dispersion, to a complete new set of rules for developing hardness stats for armored vehicles and penetration effects for anti-armor weapons, to rules for the use of mortars and artillery in the game. Off the top of my head, in the last two months, the line has added rules for water cannons and advice for the use of "plot device weapon systems" inside your game.

Along with the numerous modifications, the line provides the most detailed weapon and military vehicle entries you'll ever find in an RPG supplement, and has covered in excess of 800 weapons and 100 military vehicles thus far.

Learn more here

 

[tjoneslo]

Your link is broken.

 

[D_Sinclair]

The wonders of posting in the middle of the night after six hours of playtest participation. The link is fixed.

 

[Zoatebix]

Ooh! All good stuff. I have T20, and I've read previews of and have some Big Bang products on my wish list. That wizards' website page has some ideas that mesh with stuff I've already been considering.

Just to have a complete list of resources on the record in this thread, Dave Pulver's (of GURPS Vehicles fame) Military Vehicles book (based on his d20 Mecha rules, both published by Guardians of Order) has some great design parameters and several conversion formula for statting real-world vehicles and weapons from known real-world values.

 

[D_Sinclair]

Ooh! All good stuff. I have T20, and I've read previews of and have some Big Bang products on my wish list. That wizards' website page has some ideas that mesh with stuff I've already been considering.

Just to have a complete list of resources on the record in this thread, Dave Pulver's (of GURPS Vehicles fame) Military Vehicles book (based on his d20 Mecha rules, both published by Guardians of Order) has some great design parameters and several conversion formula for statting real-world vehicles and weapons from known real-world values.

Good time to clean out that wish list, since there be stuff on sale, for $2 or less, until the end of gencon, anyway.

 

[JBowtie]

Stone to Steel has an appendix on materials that covers deriving hardness and hit points, and their master chart covers those stats off for all the weapons introduced. It's been brought out in PDF form recently (I bought a copy) and I am suitably impressed.

ST COoley also put out a book some time back - Treasures and Objects d'Art, I believe - that has a ton of materials, an alternate crafting system, and was apparently pretty deeply researched - most of the hardness/hot point numbers were calculated from real-world data and normalized to d20 values. It's a bit ugly layout-wise but very crunchy and includes lots of material enhancements (like lacquering) that you might not immediately think of.

 

[Zoatebix]

Thanks JBowtie and D_Sinclair! I've got a lot to find and chew on!