CFrame Help (Rainbow Effect)

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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.

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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.