I was doing some work with the Spacejam calculator and gravity and I ran into a conundrum:
- Hitstun is calculated after gravity knockback is added to total
- Gravity knockback is applied only to the vertical knockback component
- vertical KB component is based on the launch angle
- launch angle can be changed with DI
which leads to the following question: can DI affect your launch angle in such a way that you received decreased gravity KB and thus less hitstun? The answer is
no, DI cannot affect how much hitstun you receive.
Here's how I tested it:
- Training mode, playing Captain Falcon against Fox. (to remove Rage and Staling from KB formula. Fox is my test subject as he has the biggest gravity KB modifier - 11.32)
- Establish constant parameters for moves to test vertical DI as well as horizontal DI
- For horizontal DI, I use the foot hitbox of Falcon's strong hit up air (10% damage, 10 BKB, 100 KBG, 70-degree launch angle.)
- For vertical DI, I use any hitbox of Falcon's down tilt (10% damage, 38 BKB, 80 KBG, 25-degree launch angle.)
- Use the Spacejam calculator to calculate raw KB values at various %s with no DI, then incorporate gravity KB to determine without-DI knockback at those %s, use that to calculate gravity-adjusted hitstun
- Up air at 0% on Fox deals 48.1786 units of gravity-adjusted KB and 18 frames of gravity-adjusted hitstun
- Down tilt at 0% on Fox deals 67.6155 units of gravity-adjusted KB and 27 frames of gravity-adjusted hitstun
- Choose a critical threshold of knockback/hitstun that can be confirmed visually
- When a target receives >32 (that is, 33 or more) frames of hitstun they will enter DAMAGEFLY/tumble state
- Calculate which %s produce the closest amounts of KB/hitstun to that threshold
- Up air at 39% on Fox deals 84.7146 units of gravity-adjusted KB and 32 frames of gravity-adjusted hitstun
- Up air at 40% on Fox deals 85.6523 units of gravity-adjusted KB and 33 frames of gravity-adjusted hitstun
- Down tilt at 26% on Fox deals 84.8369 units of gravity-adjusted KB and 32 frames of gravity-adjusted hitstun
- Down tilt at 27% on Fox deals 90.9001 units of gravity-adjusted KB and 33 frames of gravity adjusted hitstun
- Using only DI (held direction while taunting) in every direction, attempt to cross the threshold from the opposite side (i.e., trigger DAMAGEFLY before Fox's % crosses the threshold and trigger DAMAGE3 after Fox's % crosses the threshold)
I was unable to cross the threshold or otherwise affect the hitstun received with any DI angle. This means we can conclude that
DI does not affect how much Gravity-Adjusted Knockback/Hitstun you receive from an attack.