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How can I detect when a player goes near to a part?

Asked by 9 years ago

I want to detect when a player moves, say, within 20 studs of a part. How would I do this? Are there any methods I could use or is this something that is hard, if not impossible, to do within ROBLOX?

Help much appreciated.

EDIT: I'm aware of .magnitude and how it could be used in this scenario, but as I'd be checking for distances from many parts, I wanted to know if there was an event such as .changed that would fire if the player came within a certain distance of a part.

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I'm not quite sure what you should do. You could possibly make a CanCollide = false Invisible part to represent the range and use touch to see if they're in that spot, but this is a hacky way to go at it.. You probably would need to use Magnitude/DistanceFromCharacter. I would think Region3 would be perfect for your problem, but I have been told otherwise, I do not know how to use Region3 either. alphawolvess 1784 — 9y
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I'll play around with it. I currently use the invisible blocks but they're a bit hacky. Region3 could be promising I guess. I'll take a look. MasterDaniel 320 — 9y

3 answers

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Answered by
Marios2 360 Moderation Voter
9 years ago

What you're asking for is indeed very difficult.

Your thing must be done with one line. ONE. LINE. What i said is just a sample of how frustratingly hard it is to get the distance between parts.

The only thing that makes it easier is that there are two ways to get that distance:

.magnitude

This is a Vector3 property, which obtains the distance between the vector and the origin (0,0,0). Chances are, however, you will not want the origin, but the part's position. This is unfortunately quite hard to obtain: Keep up with me here, the method will be very extensive:

You reduct any two Vector3s and "magnitude" them altogether.

print((workspace.PartA.Position - workspace.PartB.Position).magnitude)

DistanceFromCharacter()

This is a faster, albeit difficult function to use. It is a function that calculates the distance inbetween the player's character's head and the inputted Vector3. If the player's character does not exist on that time, it returns 0 instead of breaking the script.

print(game.Players.MasterDaniel:DistanceFromCharacter(workspace.Marios2.Head.Position))

Hopefully this helps, if your mind is not melted already by trying to figure out all of this.

(Moral: Don't underestimate any programming language. That's what i did with Brainfuck (the language, literally) and then i saw a clock that tells the time made with it.)

(Note: I am not making the above up.)

(Note #2: I mean no offense on this answer. The sarcasm on how simple it is is there for entertainment.)

*Edited .magnitude as of 12/12/15.

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I'm well aware of .magnitude. As I said to the above response, "I was thinking there might be an event such as .Changed that fires if a player enters the radius." MasterDaniel 320 — 9y
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Well there is no such event. However, you can instead use an invisible and intangible part in place of the radius and use the Touched event. Yes, that event fires even when you disable collision. Marios2 360 — 9y
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Answered by 9 years ago

This tells if your in range of something

brick = (put a location)
range = 20 -- the range

while true do
        wait(.1)
    plrs = game.Players:GetChildren()
    for i,plr in ipairs(plrs) do
        if plr.Character ~= nil then
            tor = plr.Character.Torso
            if (brick.Position-tor.Position).magnitude <= range then
                print(plr.Name.." is in range")
            end
        end
    end
end
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Your answer is indeed correct, except it's .magnitude with a D after the U. Mine is more extended however. Anyway, here's an upvote for the effort (And no, you're not bad at all at scripting compared to others). Marios2 360 — 9y
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Oh yes misspelled. Anyways thank you for the support aaron8888 3 — 9y
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Hmm, I was looking for a way to do it without the while loop, as I'd be replicating this code throughout my game for many different bricks. I was thinking there might be an event such as .Changed that fires if a player enters the radius. My fault - the question wasn't clear. MasterDaniel 320 — 9y
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You should add a comment to each line, explaining what they do, and cite some reference sources for the methods you use. drahsid5 250 — 9y
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Answered by 6 years ago

I know this is 3 years later, but this may be helpful to anybody else coming across this issue.

If you want to find when a player is in range of something, with an event.. the only way I have found is touched(). Now what is the efficient way?

Anytime the part in the radius is touched, or touchended run your magnitude script. This way, it won't be going constently, but goes when it is necessary. Dont want to use a part? then have fun running a function constantly :c

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well hi Igoralexeymarengobr 365 — 5y

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