Adjusting UnitFacing for 'Arc Movement' - (SetUnitAnimation)

[Fulla]

I'm working on a projectile spell that moves in an Arc up then down, like this:

Im hoping to make the projectile's angle/facing adjust with the Arc.
Currently this is what it looks like/happens (pretty ugly):

What I'd hope it will look like eventually:

In iNfraNe's Particle System, it was done with vectors like this:

set j = R2I(Atan2BJ(udg_vectorZ[v], SquareRoot(udg_vectorX[v]*udg_vectorX[v]+udg_vectorY[v]*udg_vectorY[v]))+0.5)+90
call SetUnitAnimationByIndex(u, j)

Note the missile is a Dummmy model that has multiple animations for setting its angle/facing.

• What mathmatical figures are needed to adjust it properly?
  Is Speed, Height, Angle, X, Y enough?
• What formula can correctly set the animation / facing?

I had a little try, but failed:

set aoa = R2I(Atan2BJ(GetUnitZ(dat.missile), SquareRoot(x * x + y * y)) + 0.5) + 90
call SetUnitAnimationByIndex(dat.missile, aoa)

thx for any help

 

[Viikuna]

Is that model using degrees? I mean does it have 360 animations or what?

 

[Flare]

I believe it has 180 animation indexes (not fully sure)

I have a demo map lying around with a formula for getting the correct animation index, could take a while though since my WC3 demo maps folder is full of sh*t

 

[Fulla]

I believe it has 180 animation indexes (not fully sure)

I have a demo map lying around with a formula for getting the correct animation index, could take a while though since my WC3 demo maps folder is full of sh*t

That would be great & appreciated :thup:

 

[Fulla]

I updated the first post, making it alot clearer what I'm hoping to achieve.
(BUMP)

 

[Tukki]

call SetUnitAnimationByIndex(dummy, R2I(bj_RADTODEG*Atan2(zV, SquareRoot(xV*xV + yV*yV)) + 0.5) + 90)

dummy = your unit
zV = ZVelocity
xV = XVelocity
yV = YVelocity

Or at least I believe it's something like that.

 

[Fulla]

Yup, that did it thx