How would I code the trajectory of an object?

Help and Feedback Scripting Support
1

I’ve already attempted this, but the code, for one, sends the projectile through an arc ending at the mouse’s hit point, and two, due to me using lerp as I don’t know how else I would move the rock, it slows down greatly before hitting the end point.
How could I make the rock follow the angle of fire and move at a constant speed?
Code:

while 5==5 do
		pChar=player.Character
	
		local P1=pChar.HumanoidRootPart.Position
		local sH=(mhit-P1).Magnitude
		local sO=mhit.Y-P1.Y
		local theta=math.asin(sO/sH)
		ex=( Vector2.new(rock.Position.X,rock.Position.Z) - Vector2.new(mhit.X,mhit.Z) ).Magnitude
		local rockheight=(ex+math.tan(theta)-
			((workspace.Gravity*ex^2) / ( 2*(Velocity^2)*( math.cos(theta)*math.cos(theta) )) )
		)
		desiredpos=Vector3.new(mhit.X,rockheight,mhit.Z)
		
		rock.CFrame=rock.CFrame:Lerp(CFrame.new(desiredpos),.1)
		
		print("(",P1,")",theta,ex,rockheight,"	(",rock.Position,")")
		task.wait()
	end

Incase there’s any confusion, this is encased in a function with “player:Player, mhit:Vector3, rock:Instance” in the parenthesis.

1 Like
2

You could tween it instead, and pass down a TweenInfo that uses a constant easingStyle.
Though, tweening CFrames on the server, especially if done with multiple instances, can be quite performance heavy. I’d recommend you run this logic on the client.

3

I highly recommend this article: Modeling a projectile's motion

What you’re doing is pretty over-complicated and inefficient.

4

What would I tween though? Like would I make a table of points along the trajectory and tween to each one? and if i did how would i get the points?

5

Essentially yes, but that would probably end up looking mechanical and isn’t the most performant.
If what you are looking for is a projectile for combat or something that requires a more natural feel, you should adapt the method suggested by @doomguy2164, or you could try using a Vector3Curve.