I just did a test, by using my same heightmap for a 1x1 patch for all the patch files

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So it is as I feared and you said so as well they cut up the terrain for each patch. This complicates things quite a bit. That means I need to cut up the heightmap on parsing and then pick which patch files to update and hope I pick the right order as well.

I also have to determine how many patch files there are based on the size of the bitmap. This is a major rewrite from the code from something simple to something more elaborate frown