Octomap occupancy indexing convention

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Hi,

How does Octomap index into the occupancy grid? I am trying to visualize an occupancy map in a different software, and all I have are the indices of the points that are occupied in the grid as given by octomap. However, I don't know what indexing convention to follow and whatever seemed intuitive to me isn't correct since the output cloud doesn't look nearly like I expect it to be.

Thank you.