Tutorial BP Single Class Multidimensional Array

[Invius]

Hi here’s something that I think, that it could be useful for someone:
Base Class:

Variables:

//I’m using Actor (cause I need some functionality), but it can be simplified using just UObject
Initialize using this function “Setup”:

Make functions to use your multidimensional array:

Usage:
Initialize:

Get Element from array:

[llYuell]

Thank you very much.

[Bits360]

If you need to make a multi-dimensional array, structs of arrays can work too.

[Invius]

More simple yes, but less functionality and when you modify something in the structure, it has the risk of corrupting, structures are very unstable.

[Invius]

I’ve made some small changes, this new version will allow more things:
Base Class:

Variables:

//I’m using Actor (cause I need some functionality), but it can be simplified using just UObject

Initialize using this function “Setup”:

(I’ve used arrays instead of a map because maps dont respect order of input)
Setup Auxiliary Functions:

This is only for child classes:

Make functions to use your multidimensional array:

To loop through you multidimensional array create a macro library using its parent class:

Create Function in Macro:

On base class:

Multidimensional Array with int/float values:
Create child Class:

variables:

Make functions to use your multidimensional array:

(I like to create my own setters and getters)


To fill array with one value:

Usage:

[midgunner66]

Idk if this is what you’re trying to achieve, but if you’re trying to make a general-purpose multidimensional array, it can be done simply by converting it into a one-dimensional array:

The size of the array is the product of the resolution (size) of all axes (e.g. resX * resY for 2D, and resX * resY * resZ for 3D).
And here are the indexing functions for 2-dimensional & 3-dimensional arrays, which include both coordinate-to-index and index-to-coordinate:

Coordinate-to-index converts a multidimensional coordinate into a one-dimensional coordinate (i.e. the index in the one-dimensional array), and index-to-coordinate does the opposite.
This also allows you to convert between dimensions; e.g. to convert from 2D to 3D, do 2D->1D->3D.

[Invius]

This is a solution for someone like who is not really good at math like me and want a self made multimensional array solution: But hey, your comment here could be useful for other people who has a better understanding of math.

[midgunner66]

Sorry, should’ve posted an actual example.
The first image shows the utility functions, and the second image shows how to use them.
For your case, you only need the Setup & CoordToIndex functions; the IndexToCoord is an extra utility.

[Invius]

What I’m trying to do and I’m sorry for not understanding you in the first comment, is to show a how to have a multi purpose multidimensional array, not just for numbers but anything else.
Edit: maybe my naming scheme was not the best and i’m also sorry for that too.

[midgunner66]

Oh, I see what you mean. I guess I misunderstood what you were trying to do. Sorry for the confusion.