Minetest-WorldEditAdditions/worldeditadditions/lib/ellipsoidapply.lua

70 lines
3.3 KiB
Lua

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--- Similar to cubeapply, except that it takes 2 positions and only keeps an ellipsoid-shaped area defined by the boundaries of the defined region.
-- Takes a backup copy of the defined region, runs the given function, and then
-- restores the bits around the edge that aren't inside the largest ellipsoid that will fit inside the defined region.
-- @param {Position} pos1 The 1st position defining the region boundary
-- @param {Position} pos2 The 2nd positioon defining the region boundary
-- @param {Function} func The function to call that performs the action in question. It is expected that the given function will accept no arguments.
function worldeditadditions.ellipsoidapply(pos1, pos2, func)
local time_taken_all = worldeditadditions.get_ms_time()
pos1, pos2 = worldedit.sort_pos(pos1, pos2)
-- pos2 will always have the highest co-ordinates now
-- Fetch the nodes in the specified area
local manip_before, area_before = worldedit.manip_helpers.init(pos1, pos2)
local data_before = manip_before:get_data()
local time_taken_fn = worldeditadditions.get_ms_time()
func()
time_taken_fn = worldeditadditions.get_ms_time() - time_taken_fn
local manip_after, area_after = worldedit.manip_helpers.init(pos1, pos2)
local data_after = manip_after:get_data()
local radius = {
x = (pos2.x - pos1.x) / 2,
y = (pos2.y - pos1.y) / 2,
z = (pos2.z - pos1.z) / 2
}
local e_centre = {
x = pos2.x - radius.x,
y = pos2.y - radius.y,
z = pos2.z - radius.z
}
for z = pos2.z, pos1.z, -1 do
for y = pos2.y, pos1.y, -1 do
for x = pos2.x, pos1.x, -1 do
local x_comp = (x - e_centre.x) / radius.x
local y_comp = (y - e_centre.y) / radius.y
local z_comp = (z - e_centre.z) / radius.z
local distance_mult = x_comp*x_comp + y_comp*y_comp + z_comp*z_comp
-- Roll everything that's outside the ellipse back
if distance_mult > 1 then
data_after[area_after:index(x, y, z)] = data_before[area_before:index(x, y, z)]
end
end
end
end
-- Save the modified nodes back to disk & return
-- No need to save - this function doesn't actually change anything
worldedit.manip_helpers.finish(manip_after, data_after)
time_taken_all = worldeditadditions.get_ms_time() - time_taken_all
return true, { all = time_taken_all, fn = time_taken_fn }
end