I've never seen anywhere which says the dINT inflection points and D caps for each spell.
If you're following a spell damage formula in trying to calculate how much damage your spell will do before you cast it, it's like you're meant to guess when your dINT might pass the "inflection point", with each +1 dINT after this point being worth half, +0.5.
This is all from what I tested around a year ago:
Inflection point = can be found where D reaches exactly half-way between the value of V and the capped value of D.
Cap D = can be found by multiplying the Inflection Point dINT value by 2, then multipy by M, then add the value of V.
There's also an interesting pattern in the inflection point values too:
Code:
Stone: V=10 M=1.0 InflectionPoint=dINT+16 Cap D=42 (dINT+48)
Water: V=16 M=1.0 InflectionPoint=dINT+25 Cap D=66 (dINT+75)
Aero: V=25 M=1.0 InflectionPoint=dINT+35 Cap D=95 (dINT+105)
Fire: V=35 M=1.0 InflectionPoint=dINT+46 Cap D=127 (dINT+138)
From this point on, all caps were untested and assumed as: 2 * InflectionPoint * M + V
Code:
Blizzard: V=46 M=1.0 InflectionPoint=dINT+60 Cap D=166 (dINT+180)
Thunder: V=60 M=1.0 InflectionPoint=dINT+78 Cap D=216 (dINT+234)
Stone II: V=78 M=1.0 InflectionPoint=dINT+95 Cap D=268 (dINT+285)
Water II: V=95 M=1.0 InflectionPoint=dINT+113 Cap D=321 (dINT+339)
Aero II: V=113 M=1.0 InflectionPoint=dINT+133 Cap D=379 (dINT+399)
From this point on, all inflection points are untested and assumed according to the obvious pattern above:
Code:
Fire II: V=133 M=1.0 InflectionPoint=dINT+155 Cap D=443 (dINT+465)
Blizzard II: V=155 M=1.0 InflectionPoint=dINT+178 Cap D=511 (dINT+534)
Thunder II: V=178 M=1.0 InflectionPoint=dINT+210 Cap D=598 (dINT+630)
With the M value changing at this point, the assumptions might be less likely to be correct, but continuing:
Code:
Stone III: V=210 M=1.5 InflectionPoint=dINT+236 Cap D=918 (dINT+708)
Water III: V=236 M=1.5 InflectionPoint=dINT+265 Cap D=1031 (dINT+795)
Aero III: V=265 M=1.5 InflectionPoint=dINT+295 Cap D=1150 (dINT+885)
Fire III: V=295 M=1.5 InflectionPoint=dINT+320 Cap D=1255 (dINT+960)
Blizzard III: V=320 M=1.5 InflectionPoint=dINT+345 Cap D=1355 (dINT+1035)
Thunder III: V=345 M=1.5 InflectionPoint=dINT+381 Cap D=1488 (dINT+1143)
Stone IV: V=381 M=2.0 InflectionPoint=dINT+410 Cap D=2021 (dINT+1230)
Water IV: V=410 M=2.0 InflectionPoint=dINT+440 Cap D=2170 (dINT+1320)
Aero IV: V=440 M=2.0 InflectionPoint=dINT+470 Cap D=2320 (dINT+1410)
Fire IV: V=470 M=2.0 InflectionPoint=dINT+506 Cap D=2494 (dINT+1518)
Blizzard IV: V=506 M=2.0 InflectionPoint=dINT+541 Cap D=2670 (dINT+1623)
Thunder IV: V=541 M=2.0 InflectionPoint=dINT+626 Cap D=3045 (dINT+1878)
At the time I was doing the testing, I could only test up to around dINT+150, on RDM.
I didn't try testing in abyssea back then, but I guess now at 90~95 with better atma, abyssite and brew, it should be easy enough to test whether the assumptions above are correct?