Directional influence

Directional influence, abbreviated DI, is the control that an attacked opponent has over their trajectory in Super Smash Flash 2 and Fraymakers.

When an attack sends a character flying, directional influence can be used to alter the trajectory of the target. DI cannot reduce or negate the momentum of a move's knockback; attempting to do so will only make the trajectory straighter, harming the player's chances of recovering back to the stage.

When knocked vertically, pressing the left or right key will slant the trajectory of flight sideways, causing the character to fly diagonally. Similarly, pressing up or down when knocked horizontally will slant the trajectory of flight upwards or downwards, again towards a diagonal flight path. As the corners of a stage are further away than the sides of the stage, the momentum that would kill a character when sent flying straight up or straight sideways is survivable if directional influence is used to make the character fly towards the corners of the stage.

Smash directional influence
Smash directional influence, abbreviated SDI and also referred to as nudging in Fraymakers, is a mechanic that allows players to slightly alter their position during the freeze frames of being hit by an attack before getting launched. To perform it, the player presses any direction of movement or the C-stick during the freeze frames to move the character slightly in which ever direction was input. SDI can be used to move into a wall or ceiling to tech, break out of combos, or move away from the blast line.

In SSF2, characters can attempt to use SDI during any frame of an attack's hitstop. The amount they are able to move depends on a multiplier called "sdiDistance" that is different for each move, with higher values allowing for larger distances. In Fraymakers, characters can only nudge one time during hitstop, with the distance depending on a multiplier called "hitstopNudgeMultiplier". In both games, setting the variable to 0 prevents the mechanic from being used altogether.

Trivia

 * Oddly, both SDI and DI are referred to as "sdiDistance" in the code for SSF2.