Populating a new chunk from scratch results in an ArrayIndexOutOfBoundsException

[querz]

Populating a new chunk from scratch results in an ArrayIndexOutOfBoundsException

[Querz]

setPaletteIndex does not change the size of the blockStates array (as stated in the javadoc). You will have to know its size beforehand or adjust its size manually.

[toddharrison]

So if set it to the max number of blocks, will it reduce when I run the cleanup or will I need to do that as well? I suppose I could also do preprocessing, but I was doing it in a streaming manner instead for performance.

[Querz]

You could set the initial length of the blockStates to its maximum length (4096) and at the end after creating a new Section object call cleanupPaletteAndBlockStates, but then you could also just set the palette indexes manually without using setPaletteIndex, something like this:

CompoundTag sectionData = new CompoundTag();
long[] blockStates = new long[4096];
ListTag<CompoundTag> palette = new ListTag<>(CompoundTag.class);

for (int index = 0; index < 4096; index++) {
  // calculate paletteIndex here
  blockStates[index] = paletteIndex; // setting palette index manually
}

sectionData.put("Palette", palette);
sectionData.put("BlockStates", blockStates);

Section section = new Section(sectionData, 2584);
section.cleanupPaletteAndBlockStates();

[toddharrison]

Thanks! Giving it a shot. Want me to close this?