How would I convert a direction vector to a 3D rotation vector?

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#1

I have a direction vector calculated by getting the vector from PointA to PointB .Unit. How would I convert this vector into a 3D rotation vector (36,210,-43) for use in a BodyGyro, so a part could face this point using the physics engine?

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#2

BodyGyro has a CFrame property which’ll only change to the rotational data in the CFrame.

You could construct a CFrame using the overload:

CFrame.new(Position : Vector3, LookAt : Vector3)

Then set the BodyGyro’s CFrame to this newly constructed CFrame.

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#3

This doesn’t seem to work however. I get jerky movements that don’t coincide at all with the direction I want it to face. That method is also deprecated.

#4

If you want the BodyGyro to make a part or assembly face a certain position, that should work. No direction vector is needed at all.

#5

I explained however, that it doesn’t work. Constructing a CFrame (using the deprecated method) results in incredibly jerky movements with my BodyGyro.

#6

Hmm, perhaps it may be best to use CFrame.FromMatrix for this then, it takes a rightVector and upVector to create a rotation.

Cross the directional you have with a Vector with just 1 in the Y axis to get the rightVector then you can Cross the rightVector with the directional to get a upVector.

Code example:

local Position = --// Position here
local Direction = --// Vector here
local Up = Vector3.FromAxis(Enum.Axis.Y)
local RightVector = Direction:Cross(Up)
local UpVector = RightVector:Cross(Direction)

local CoordinateFrame = CFrame.FromMatrix(Position, RightVector, UpVector)
#7

Seems to work fine for me.
https://gyazo.com/112eab1f794cfa5cced92b6d3d14a886

Maybe your BodyGyro settings are not correct.

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