working with flattened 3d arrays in BP

Development Programming & Scripting Blueprint
1

hey everyone! UE4 newbie here!
I’m trying to build my first blueprint (trying to make a flattened 3d int array for a sort of random dungeon generator) so I started with this video as my reference Blueprint Generating Procedural Rooms | Live Training | Unreal Engine - YouTube and I managed to do this

img1.jpg
img1.jpg1244×679 184 KB

which got me a nice cube made out of cubes
img2.jpg
img2.jpg1244×679 59.8 KB
my problem is that I am terrible at math and I’m making the flattened 3d array version of those cubes with random examples I found on the web. I think I found the algorithm (not entirely sure it is right) for indexing the cubes in the array
img3.jpg
img3.jpg1635×587 221 KB
but now I need to get the XYZ just with the array’s index and here’s where I get lost :frowning:

so if anyone could point me to any examples or just throw any advice I would greatly apreciate it!

2

I don’t have time to figure out the algorithm right now, but I’m pretty sure that you will have to use 2-3 “Division w/ Remainder” nodes, the int return value will give you the X/Y/Z.

3

Thanks a lot for the quick reply, I’ll look up the division node and see how it works!

4

Using the Division (whole and remainder) node, you can get your x, y and z coordinates for index i as follows:
z = i / (x*y), which leaves remainder r1
y = r1 / x, which leaves remainder r2
x = r2

5

Yep, that looks about right.

6

Well, it appears that the Division (whole and remainder) nodes require floats, so you’re probably better off doing it by hand to keep integers all the way.
I attached a picture showing how I did it, without checking for the validity of the index.

7

Just got back from work, tried it and it works! thanks a lot for the help!