Help Getting Point In World Space From Point On Transformed Plane

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#1

My goal is to get a position in world space, from a point relative to an infinite “plane” that is transformed (orientated). I don’t really have or want a plane, but I just use one to visualize it.

Variables I Have:

local PlaneOrigin -- The Position of the 'Plane' in world space
local PlaneDirection -- A vector describing its orientation, for context, it is equal to (SomePoint - PlaneOrigin).Unit
local PlanePoint -- A Vector2 relative to the plane

Here is an example of what I want:
image
Figure 1. Plane As 2D, Black Would Be the Origin, Red Is The Dot Wanted

image
image694×498 24.4 KB

Figure 2. Point Translated To World Space, The Red Arrow Shows the Direction, and Just Like on the 2D Plane, the Red Dot is Whats Wanted

What I have tried:
I tried 2 methods, first one was intuition, but I couldnt get it to work,

local localPoint3D = Vector3.new(PlanePoint .X, 0, PlanePoint .Y)
local pointOnPlane = PlaneOrigin + (PlaneDirection * localPoint3D)

The second method got really wonky when approaching 0,

local up = PlaneDirection
local right = up:Cross(Vector3.new(PlanePoint .X, 0, PlanePoint .Y)).Unit
local forward = right:Cross(up)

Any Help Would Be Helpful!

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#2

So first let me point out a potential issue with your representation. I can rotate your plane around that red arrow while still having the origin stay still and facing the right way. Which means there are technically infinite ways for the plane to exist and that means there are technically infinite answers.

But this is actually pretty trivial if you’re using a CFrame. There actually are functions for this. PointToWorldSpace

Where the cframe you use it on is the CFrame that represents your plane. So you would go plane.CFrame:PointToWorldSpace(positionOnPlane)

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