CFrame Help (Rainbow Effect)

[anon53193547]

Hello! How can I create a cool effect like this:

Notice how the Parts spawn, and then they go in a rainbow motion through the air until it reaches a specific location? (I know how to make them spawn in a random area, but for the purpose of this lets just say that it spawns in a specific area, and THEN does the rest.)

One more thing… Those are PARTS. It isnt a beam, but individual parts.

[ComplexPriorities]

Use a beam, this isnt really anything to do with CFrame

[anon53193547]

Those are parts… I have gone under them and such. They are actual parts

[dthecoolest]

You can use bezier curves to draw something like this, however in your case the midpoint at the top of the arc should go “up” relative to the world and not “right” relative to the CFrame.lookAt from current position to target position.

Cubic Bezier Curve

Nice catch, haven’t considered it while typing the solution. For this issue instead of using a predetermined length magnitude, we can use a percentage of the length of the direction vector if you want the curve to scale in size relative to the length of the direction from the position to lookAt. This percentage, percent1,percent2 will be a decimal percentage that’s pretty arbritrary. --percent1,percent2 = 0.25, 0.25 --1/4 of the length of the positionToLookAt vector local function bezierCurvePo…

Details on the method

So here is how it goes I believe:

--percent1,percent2 = 0.25, 0.25
--1/4 of the length of the positionToLookAt vector
local function bezierCurvePoints(position,lookAt,upLength,percent1,percent2)
	local upVector = Vector3.new(0,1,0)
	
	local positionToLookAt = lookAt-position--vector from position to lookAt/Target point
	local unitDirection = positionToLookAt.Unit
	
	--find the right vector relative to the world
	local rightVector = positionToLookAt:Cross(upVector).Unit
	--find the new upvector
	local upVector = rightVector:Cross(unitDirection).Unit

	local midpoint = position+positionToLookAt/2
	
	--right length influences the length it goes "right"
	local midpointToTheSky= midpoint + upVector *upLength
	
	local p2 = midpointToTheSky- positionToLookAt*percent1
	
	local p3 = midpointToTheSky+ positionToLookAt*percent2
	
	return p2,p3
	
end

Then apply the cubic bezier curve equation with p2 and p3

function cubicBezier(t, p1, p2, p3, p4)
	return (1 - t)^3*p1 + 3*(1 - t)^2*t*p2 + 3*(1 - t)*t^2*p3 + t^3*p4
end

Another option is to use the quadratic projectile motion equation to model the arc, it should also be more physics like if you are going for a more realistic approach.

Modeling a projectile's motion

This guide was originally written for scriptinghelpers. The original can be found here. As a somewhat active member of the Scripting Helpers discord one of the most common questions I see is how to have a projectile travel an arc. Most people want to know how to do this for things like basketballs or cannon balls and so forth. Since this is such a popular question I thought it would be worth writing a blog post on it and talking about a few other things we can extend from our findings. Deriv…

[anon53193547]

Hey, Im very confused, haha.

I would prefer CFrame

[MRKYLO20]

You could try tweeting it. Try looking at this TweenService | Documentation - Roblox Creator Hub

and check out some YouTube videos on tweening.

[CoderHusk]

Use my (ok i guess you cant credit math but I kinda discovered it for myself when messing around with the vertex formula) formula for getting arc motion within specific parameters

Desmos | Graphing Calculator

Then have h be a random value with t being the distance between the start and the end. Alternatively you could also just use my Math++ library

Make your workflow easier with Math++!

Introduction Lua has a default math library, simply the class “math”. However I felt that some of the stuff I wanted and I am sure you too were missing from it. So I decided to make a math module, called Math++ to help us. Installation To install Math++ simply get a copy from it here. https://www.roblox.com/library/5901655059/Math You then need to place the Math++ module in a directory in which the script you will use to call the library can access. For access from the server and client I’d…

[ItsNathanity]

I wonder what he’s making this time

[anon53193547]

Ask me 2 months ago. Perhaps you’ll find an answer

[ItsODRJR]

To DomTheMomRBLX (Two months ago),

I wonder what he’s making this time

From,
ItsODRJR