Loops

Loop

Loop repeats the commands up to its EndLoop, as many times as you give it. Loop(0) repeats forever, so give it a Wait or something else that takes time, and a way out with BreakLoop. This loop waits until the player is past the point where X is 100:

Loop(0)
    Call(GetPlayerPos, LVar0, LVar1, LVar2)
    IfGt(LVar0, 100)
        BreakLoop
    EndIf
    Wait(1)
EndLoop

Command	What it does
Loop(TIMES)	Repeats the commands up to EndLoop a number of times. Loop(0) repeats until something leaves the loop.
EndLoop	Ends the loop.
BreakLoop	Leaves the innermost loop.
ContinueLoop	Skips to the next repeat of the innermost loop.
RetryLoop	Starts the current repeat of the innermost loop again, without counting it.

An EVT script can have up to 8 Loop and Lerp blocks active at once.

Lerp

Lerp moves a variable from one value to another over a number of frames, running its commands once a frame with the new value. Use it to animate something, such as fading in an NPC:

Lerp(LVar0, 0, 255, 30, EASING_LINEAR)
    Call(SetNpcImgFXParams, NPC_SELF, IMGFX_SET_ALPHA, LVar0, 0, 0, 0)
EndLerp

EASING sets how the value speeds up and slows down, such as EASING_LINEAR or EASING_QUADRATIC_OUT. START and END can be whole or decimal numbers.

Command	What it does
Lerp(VAR, START, END, FRAMES, EASING)	Repeats once a frame, setting VAR to a value moving from START to END.
EndLerp	Ends a Lerp, and waits a frame before the next repeat.

The commands run for each frame from 0 to FRAMES, so you don't need a Wait. BreakLoop leaves a Lerp early, but ContinueLoop and RetryLoop can't be used inside one, and one Lerp can't be inside another.