Posted by: crucis
« on: November 09, 2012, 02:06:50 PM »In the interest of simplicity, why not create them seperately (to the point of giving them HI’s) – and then ignoring what type (i.e. T/ST) of planet they are….
An example method. All T-type races/planets roll HI on a d10. All ST-type races/planets roll HI on a D10+5. When it comes time to determine habitability, the type of planet is ignored (i.e. T or ST), and only the HI matters.
You can justify it by stating that the for T races finding a benign ST, that the planetary formations (i.e. high altitude platea’s) make ideal habitable zones; and for vice versa, the T planet is incredibly dense, and has a higher gravity then normal.
But first decide what your desired outcome is (see below), before trying to determine how to determine the outcome.
Matt, I tried making the above idea of ST's using an HI of 1d10+5 but it doesn't work. The math just doesn't work out. BUT... last night this idea caused variation of the idea to spawn in my mind.
As in Ultra, set the ratio of T's to ST's at 2:1 in the planetary mass table. THEN, assign Type T planets their usual 1d10 HI (i.e. 1-10), but assign ST planets an HI of 10 + (1d10/2) FTU, or 11-15. This means that the overall Habitability range is 1 to 15, with 1-10 covering 2/3's of the range and 11-15 covering 1/3 of the range, matching the 2-1 T/ST ratio.
Then when calculating HD's, you can ignore planet type and treat the HI range as a unified whole. And some Type T races could see some Type ST planets as Benign or Harsh, and vice-versa, depending on how wide the HD ranges were set. I think that this model probably works best if the Benign HD range is 0-1, the Harsh HD range is 2-3, and Hostiles are 4 or greater.
This model is NOT meant to be wrapped around, and there will be some imbalances at the extremes of 1 and 15. But the upper HI for T and the lower HI for ST are no longer extremes, since they are merged together in a way that preserves statistical balance of the environment types.
On a side note, this model might feel like it worked a little better if HI's were on a larger scale. The problem with the 1-15 scale is that HD ranges can easily swallow up the 5 point ST HI range. If the scale was 1-100 (1d100) for T's and 101-150 (100 + (1d100/2 FRU)) for ST's, it would feel like the scale wasn't quite so constricting, though statistically it'd really be the same.
What I mean by this is that on the 1-15 scale, if the HD ranges were 0-1 for B and 2-3 for Ha, then an ST race would be limited to HI's of 11 or 12 if it didn't want to lose any Benigns or Harshes off the upper end of the scale. This may make the ST HI's seem a bit restricted. But if you use a 1-150 scale, with similarly upscaled HD ranges of 0-10 for Benigns and 11-30 for Harshes, while you'd still be limited to the same amount of scale on a percentage basis, having an ST race "limited" to 101-120 might not feel quite so limiting (though it would be a bit of an illusion).
Also, one cannot fix these little imbalances by trying to use a full d10 scale for ST's because by using a 10 point scale for ST's you reduce each point in the scale to on 3.3% points, whereas 1 point on the 5 point scale represents 6.7% points, which exactly equals what 1 point on the 10 point T HI scale is when you split T/ST's 2:1. When both are using 10 point scales, any HD's that cross the T/ST boundary start becoming unbalanced when T HI points are worth 6.7% and ST HI points are worth 3.3%. The balance comes from keeping T HI points equal to ST HI points statistically speaking.
Regardless, I think that this idea has real merit, particularly for people who think that the wraparound model is unrealistic.