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Old 03-10-2011, 08:18 PM   #1
Alden Loveshade
 
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Default Powerstone Program

The Powerstone formula in GURPS Magic seems very sensible and there is a handy chart giving the typical price for many powerstones. But still, doing the formula for several stones with capacities that don't match the ones in the table takes time and, if you're like me, can involve mistakes.

I admit I only did a cursory search, but does anyone know an online or downloadable program for figuring typical powerstone costs? I'm thinking of something where you type in the capacity and it spits out a price. I could write such a program myself (it would be very basic), but if I’m too lazy to use the formula….
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Old 03-10-2011, 08:19 PM   #2
Diomedes
 
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Default Re: Powerstone Program

Quote:
Originally Posted by Alden_Loveshade View Post
The Powerstone formula in GURPS Magic seems very sensible and there is a handy chart giving the typical price for many powerstones. But still, doing the formula for several stones with capacities that don't match the ones in the table takes time and, if you're like me, can involve mistakes.

I admit I only did a cursory search, but does anyone know an online or downloadable program for figuring typical powerstone costs? I'm thinking of something where you type in the capacity and it spits out a price. I could write such a program myself (it would be very basic), but if I’m too lazy to use the formula….
I turned it into an Excel spreadsheet a while back.
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Old 03-10-2011, 10:10 PM   #3
munin
 
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Default Re: Powerstone Program

Quote:
Originally Posted by Alden_Loveshade View Post
... I'm thinking of something where you type in the capacity and it spits out a price...
Try making a favorite/bookmark out of the following as the address, then load the favorite/bookmark. It should ask you for a powerstone capacity, then bring up the answer on google.

Code:
javascript:c=prompt('Powerstone%20Capacity:','');if(c){document.location='http://www.google.com/search?q=(10*'+c+'^2%252B40*'+c+')*(54%2F53)^'+c+'%252B20*'+c};

Last edited by munin; 03-10-2011 at 10:20 PM.
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Old 03-10-2011, 11:10 PM   #4
Alden Loveshade
 
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Default Re: Powerstone Program

Thanks for the suggestions. Ironically, shortly after I asked the question I thought of another way to do it, although this might be a bit more work than your suggestions.

Enchanted Powerstone cost

Save the equation for the powerstone cost in a word processing program: ((10 * P^2 + 40 * P)/(53/54)^P) + (20 * P)

Replace All the P's with the capacity (for a 100 point powerstone P = 100; 157 point powerstone P = 157)

Then copy and paste it into an online scientific calculator such as found at http://www.ecalc.com/

Unenchanted Powerstone cost

To learn the cost of an unenchanted "stone" that would work efficiently to be enchanted to P capacity, do the same thing with

10 * P^2 + (40 * P)
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Old 03-11-2011, 06:22 AM   #5
Akicita
 
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Default Re: Powerstone Program

RPK hosts a spreadsheet on his MyGURPS site that covers both powerstones and other enchantments. It's designed to stay close to RAW while allowing the user to vary the base assumptions to personal taste.

Edit: Oops. Forget I said anything; it doesn't seem to be there. Will post again if I figure out where it is. AH, here we go:


http://www.mygurps.com/pics/Pstone_rev2010.xls
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Old 03-11-2011, 06:43 AM   #6
Bruno
 
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Default Re: Powerstone Program

Quote:
Originally Posted by munin View Post
Try making a favorite/bookmark out of the following as the address, then load the favorite/bookmark. It should ask you for a powerstone capacity, then bring up the answer on google.

Code:
javascript:c=prompt('Powerstone%20Capacity:','');if(c){document.location='http://www.google.com/search?q=(10*'+c+'^2%252B40*'+c+')*(54%2F53)^'+c+'%252B20*'+c};
I love bookmarklets. This is a very clever and marvelously portable solution!
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Old 03-11-2011, 09:25 AM   #7
Alden Loveshade
 
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Default Re: Powerstone Program

Quote:
Originally Posted by Akicita View Post
RPK hosts a spreadsheet on his MyGURPS site that covers both powerstones and other enchantments. It's designed to stay close to RAW while allowing the user to vary the base assumptions to personal taste.

Edit: Oops. Forget I said anything; it doesn't seem to be there. Will post again if I figure out where it is. AH, here we go:


http://www.mygurps.com/pics/Pstone_rev2010.xls
Thanks for the link! It looks useful for other things as well.
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My first GURPS book has been edited and is awaiting playtest. What is it? It's [REDACTED]
Exchange Students (fantasy/horror/science fiction anthology including my story set in my GURPS galaxy)
Online interview of myself and one of my published GURPS characters
Home page http://alden.loveshade.org
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Old 03-11-2011, 11:27 AM   #8
Anthony
 
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Default Re: Powerstone Program

The powerstone formula in vanilla GURPS is actually somewhat problematic because it makes no attempt to address the issue of quirks; the spreadsheet mentioned above seems to make some attempts at fixing the issues, though I have quibbles with details (notably, he leaves out the entire issue of powerstones created with cheap materials, and they actually matter a lot. I did some of my own analysis here).

Last edited by Anthony; 03-11-2011 at 11:34 AM.
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Old 03-11-2011, 01:15 PM   #9
Akicita
 
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Originally Posted by Anthony View Post
notably, he leaves out the entire issue of powerstones created with cheap materials, and they actually matter a lot
True, that. I originally did the spreadsheet for 3e, and just never got around to redoing it to account for the cheap material rule. Maybe someday...
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Old 03-11-2011, 02:46 PM   #10
Anthony
 
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Default Re: Powerstone Program

Quote:
Originally Posted by Akicita View Post
True, that. I originally did the spreadsheet for 3e, and just never got around to redoing it to account for the cheap material rule. Maybe someday...
It's an oddly different problem, because you don't have to decide beforehand how big of a stone you want. Thus, if it quirks, you might simply stop enchanting the item, because spending labor on something already flawed has lower value than spending labor on something unflawed. This depends a bit; enchantment-grade powerstones generally want to be specific sizes, so you probably can't sell a 30 point stone for much more than a 24 point stone (suitable for 200 energy enchantments), you may be better off pushing up to 32 (suitable for 250 energy enchantments).

Incidentally, humorous (due to complete wrongness) quote from 4e:
Quote:
Originally Posted by GURPS Magic p.22
Powerstones are essentially irrelevant; a professional Quick and Dirty enchanter, as we will see, performs several enchantments each day, and trying to use Powerstones is not a good return on investment.
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