Finding point on a Ray

Help and Feedback Scripting Support
1

Say you were casting a Ray

local RayLength = 50;

local Line = Ray.new(Origin,Direction.unit * 50)

How would I find the point that is only 30 studs down that ray?

1 Like
2

Which part of the ray would you want to search 30 studs down from?

1 Like
3

By ‘point’, do you mean the Vector3 position in the 3D world?

4

Yes

5

@goldenstein64
Clarification

Point

6

Rays wouldn’t help you do this; their only purpose is to get parts that are on them. Instead, you should use CFrames. Assuming you already have an origin and direction, this should do the trick:

-- create cframe with position of origin pointing in direction
-- better way to do this without lookAt constructor?
local rotatedOrigin = CFrame.new(origin, origin + direction)
-- offset 30 studs forward
local endPoint = rotatedOrigin:ToWorldSpace(Vector3.new(0, 0, -30))

endPoint will be given as a CFrame (you can use CFrame.Position to isolate the position Vector3). origin should be a Vector3, as should direction. This code is untested; let me know if there are issues.

7

Currently that code just return a point 30 studs back on the z axis.

Looking at the API reference ToWorldSpace does not have a second parameter.

8

I’ve edited the code slightly. Does it work now?

I’m not passing a second argument to the function at any point.

10

Well first of all setup a CFrame with your origin and unit vector…
CFrame.new(origin, origin+direction.Unit)

Secondly use a relative offset by multiplying a new CFrame with your 30 stud forward goal:
CFrame.new(origin, origin+direction.Unit)*CFrame.new(0, 0, -30)

Next you can use the .p or .Position component of the CFrame to get it’s vector3 position in world space.

And there you go, you’ve just done some CFrame magic.

7 Likes