Comparing angle difference between 2 parts

Help and Feedback Scripting Support
1

  1. What do you want to achieve? Keep it simple and clear!
    I want a beam attack in my game that the player is able to fire and once it hits a wall or the floor it creates an explosion.

    yes
    yes1152×648 18 KB

  2. What is the issue? Include screenshots / videos if possible!
    I only want the explosion to occur when the beam part and hit part have a certain difference in degrees. This is to prevent the beam to hit the ground to often when players are firing the beam.

    yes2
    yes21152×648 36 KB

  3. What solutions have you tried so far? Did you look for solutions on the Developer Hub?
    I have looked at :ToWorldSpace and other similar functions to get a relative but after testing it really doesn’t yield me the result I want. So how could I go about comparing the angles between these two parts so that the beam would only be able to hit the floor in this case when being fired forward?

2

You could use DotProduct for this.

local dot = Part1.CFrame.LookVector:Dot(Part2.CFrame.LookVector)

Basically, we get direction of one part, dot product it with other part’s direction and see if there’s a difference, for example:

if dot < 0.5 then
    -- do this
end
3

what

I took the absolute value and tried to compare it and I ended up with this.

4

Sorry for the late reply. I’m a little confused with the issue, may you please elaborate and send me your code?

5

You’ll probably want him to use the surface normal of the part rather than the look vector. I think that’s likely the issue.

7

Depending on the direction the beam is fired in Dot isn’t the same.

8

Tried looking into it but I don’t really understand it.

9

Sorry mate, I was at work. How does your system detect hits? Let’s start there.