How to 3D Array to 1D Array -> index conversion?

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I need a conversion of 3D<->1D index of an array[x][y][z] into array2[i].

I checked this thread at stackoverflow:

and grabbed their solution for

i = x + y*xMax + z*yMax*xMax

But i stumbled uppon the following problem:
Let’s assume i have a 3D “Wall” of the dimensions 1x3x3, which makes :

xMax = 1
yMax = 3
zMax = 3

Now storing those two elements at: [1][0][0] ; [0][1][0] inside array2[i] would result in:

[1][0][0] : i = 1 + 0*1 + 0*3*1 = 1
[0][1][0]: i = 0 + 1*1 + 0*3*1 = 1

Both elements interfere at the same index, what am i doing wrong or missing out?

2

you shouldn’t call the variables xMax, yMax, and zMax, because they are not actually the maximum index number, but the number of indices.
If you have an array A[4] it has indices of 0, 1, 2, and 3. the ‘max x’ is 3
your 3d array of 1x3x3 is essentially a 2d array, since one of the dimensions is 1.The first point actually doesn’t exist in your wall.