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Two dimensional array

Hey !

I would like to know if there's any two dimensional array in Blueprint scripting. I looked all over the official documentation and I only found that Array is one dimension only.

Thanks in advance !

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asked Mar 01 '15 at 09:26 PM in Blueprint Scripting

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4 answers: sort voted first

Just as small heads up.

You can use an array of structs containing another array of another variable.

So two dimensional is very much possible. I'm not quite sure how it handles more dimensions than that though as I've never tested it but I can't imagine that it'd just break.


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answered Mar 02 '15 at 12:21 AM

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avatar image sick Feb 18 '16 at 07:03 PM

It reminds me of hack used back in UnrealScript :D but yes, it's viable

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i think he got result already, but for people who may find this, solution is really simple:

  1. make 1 structure blueprint and add into it only 1 variable array of base type you need (integers for example)

  2. make 2 array variables, first should have type of you sturuct, second same like in your structure

  3. don't use "set array item", because somehow it makes your arrays "read only", so to fill your 2d array with values you must use "add" for arrays

here's screenshots:

filling such 2D array


get 2D array elements like [index1][index2] and printing values


see how printing look in game


what i didn't try:

set value in 2d array at already exist index (actually we didn't need it for our purpose, because generation of heigh map doesn't require changing after first fill), but i will try use "set array item" to see is i can set value of already exist 2d array element like [row1][column2]

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answered Jul 30 '15 at 11:14 PM

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UE4 reflection system does not support array in array (even in C++, regardless of fact that C++ allows to do so), so it's impossible to make multi dimensional array. But there very simple workarounds which makes single dimension array to work like two dimensional array, by playing allocation numbers. If one dimension has static size, you can multiply that size in allocator by number of y postions, like this:


Ofcorse you need to watch out to x not being higher or same then x_size or else it will read or set other y row. You can make functions to make it a lot cleaner and simpler

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answered Mar 01 '15 at 10:46 PM

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avatar image Atemu Mar 01 '15 at 10:53 PM

That's weird :/ I thought of doing it in C++ but if you say that it's the same problem than in Blueprint then I'll go for the one dimension array. Thank you for the tips ;)

Do you know if this will be added in the future ?

avatar image Shadowriver Mar 02 '15 at 12:41 AM

Erasio solution seems better, i forgot you could do that ;]

avatar image HollingsworthDan Aug 28 '18 at 11:15 PM

Apparently this is still an issue. Has no one written any recursion before?

I have..

TMap> MyTableOfArrays;

I suppose I should try and do this with a single TArray?

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answered Jun 16 '19 at 08:41 AM

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