Complex issue about Arrays

Minecraft has in mind. Think of a chunk (Array of three-dimensional blocks with 16 x 256 x 16). I need the block is 2 x 10 x 2 could easily get that block accessing this array index (blocks[2][10][2]) but it is not so simple, because instead of a three-dimensional array, I am using a Node for performance reasons, now I need you to help find a way to find the block 2 10 2 this Node (Disregard is a for that checks one by one the block location).

I’ve been thinking about doing something like this: chunkNode.getChild(2 * 10 * 2) But I have not tested if this will work.

You have to keep the arrays of block types around. You can’t get rid of them just because you created geometry.