many worldgen mods and gonna try technic now

mods/dfcaverns/mapgen_helper/region_functions.lua

@@ -0,0 +1,78 @@
+local mapgen_chunksize = tonumber(minetest.get_mapgen_setting("chunksize"))
+
+-- For getting large regions that don't cross mapgen block boundaries
+-- For some reason, map chunks generate with -32, -32, -32 as the "origin" minp. To make the large-scale grid align with map chunks it needs to be offset like this.
+mapgen_helper.get_region_minp_xz = function(pos_xz, mapblocks)
+	local region_size = mapblocks * mapgen_chunksize * 16
+	return {x = math.floor((pos.x+32) / region_size) * region_size - 32, y = 0, z = math.floor((pos.z+32) / region_size) * region_size - 32}
+end
+
+-- Given a position and a region scale, returns the minp corners of the four regions that the player is closest to.
+-- For example, if we have a region scale of 6 and the parameter position is at "*", the four points marked "R" would be returned.
+
+-- |-----|-----|-----|      |-----|-----|-----|      |-----|-----|-----|
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |-----|-----|-----|      |-----|-----|-----|      |-----R-----R-----|
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |    *|     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     | *   |     |      |     |    *|     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- R-----R-----|-----|      |-----R-----R-----|      |-----R-----R-----|
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- |     |     |     |      |     |     |     |      |     |     |     |
+-- R-----R-----|-----|      |-----R-----R-----|      |-----|-----|-----|
+
+-- In this way you can be sure you aren't near an area you haven't tested.
+
+mapgen_helper.get_nearest_regions = function(pos_xz, gridscale)
+	local half_scale = gridscale / 2
+	local grid_cell = {x = math.floor(pos_xz.x / gridscale) * gridscale, z = math.floor(pos_xz.z / gridscale) * gridscale}
+	local pos_internal = {x = pos_xz.x % gridscale, z = pos_xz.z % gridscale}
+	local result = {grid_cell}
+	local shift_x = gridscale
+	local shift_z = gridscale
+	if (pos_internal.x < half_scale) then
+		shift_x = -gridscale
+	end
+	if (pos_internal.z < half_scale) then
+		shift_z = -gridscale
+	end
+
+	table.insert(result, {x = grid_cell.x + shift_x, z = grid_cell.z + shift_z})
+	table.insert(result, {x = grid_cell.x + shift_x, z = grid_cell.z})
+	table.insert(result, {x = grid_cell.x, z = grid_cell.z + shift_z})
+
+	return result
+end
+
+
+-- |---|---|---|
+-- |   |   |   |
+-- |   |   |   |
+-- R---R---R---|
+-- |   |   |   |
+-- |   |  *|   |
+-- R---R---R---|
+-- |   |   |   |
+-- |   |   |   |
+-- R---R---R---|
+
+mapgen_helper.get_adjacent_regions = function(pos_xz, gridscale)
+	local grid_cell = {x = math.floor(pos_xz.x / gridscale) * gridscale, z = math.floor(pos_xz.z / gridscale) * gridscale}
+	local result = {grid_cell}
+	table.insert(result, {x = grid_cell.x + gridscale, z = grid_cell.y + gridscale})
+	table.insert(result, {x = grid_cell.x + gridscale, z = grid_cell.y})
+	table.insert(result, {x = grid_cell.x, z = grid_cell.y + gridscale})
+	table.insert(result, {x = grid_cell.x - gridscale, z = grid_cell.y - gridscale})
+	table.insert(result, {x = grid_cell.x - gridscale, z = grid_cell.y})
+	table.insert(result, {x = grid_cell.x, z = grid_cell.y - gridscale})
+	return result
+end