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cool ! shouldn't it be:

U32 ind = (xx-xStart + (yy-yStart) * 16+ ( zz-zStart ) * 16 * 16) * 2;

in your code, though ?

Whoops, yeah, you caught me. As I handwaved in the post, there's a little bit of implementation detail in the real code that I removed to clarify the algorithm. Fixed now, thanks.

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