mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-10-31 21:33:02 +00:00
80 lines
3 KiB
Lua
80 lines
3 KiB
Lua
-- ███████ ██ ██ ██ ██████ ███████ ███████
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-- ██ ██ ██ ██ ██ ██ ██ ██
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-- █████ ██ ██ ██ ██████ ███████ █████
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-- ██ ██ ██ ██ ██ ██ ██
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-- ███████ ███████ ███████ ██ ██ ███████ ███████
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--- Fills an ellipsoidal area around the given position with the target node.
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-- The resulting ellipsoid may optionally be hollow (in which case
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-- nodes inside the ellipsoid are left untouched).
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-- @param position Vector3 The centre position of the ellipsoid.
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-- @param radius Vector3 The radius of the ellipsoid in all 3 dimensions.
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-- @param target_node string The name of the node to use to fill the ellipsoid.
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-- @param hollow bool Whether the ellipsoid should be hollow or not.
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-- @returns number The number of nodes filled to create the (optionally hollow) ellipsoid. This number will be lower with hollow ellipsoids, since the internals of an ellipsoid aren't altered.
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function worldeditadditions.ellipsoid(position, radius, target_node, hollow)
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-- position = { x, y, z }
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local hollow_inner_radius = {
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x = radius.x - 1,
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y = radius.y - 1,
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z = radius.z - 1
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}
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-- Fetch the nodes in the specified area
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-- OPTIMIZE: We should be able to calculate a more efficient box-area here
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local manip, area = worldedit.manip_helpers.init_radius(position, math.max(radius.x, radius.y, radius.z))
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local data = manip:get_data()
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local node_id = minetest.get_content_id(target_node)
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local stride_z, stride_y = area.zstride, area.ystride
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local count = 0 -- The number of nodes replaced
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local idx_z_base = area:index(position.x - radius.x, position.y - radius.y, position.z - radius.z) -- initial z offset
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for z = -radius.z, radius.z do
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local idx_y_base = idx_z_base
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for y = -radius.y, radius.y do
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local i = idx_y_base
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for x = -radius.x, radius.x do
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-- If we're inside the ellipse, then fill it in
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local x_comp, y_comp, z_comp = x/radius.x, y/radius.y, z/radius.z
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local ellipsoid_dist = x_comp*x_comp + y_comp*y_comp + z_comp*z_comp
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if ellipsoid_dist <= 1 then
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local place_ok = not hollow;
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if not place_ok then
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-- It must be hollow! Do some additional calculations.
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local hx_comp = x/hollow_inner_radius.x
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local hy_comp = y/hollow_inner_radius.y
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local hz_comp = z/hollow_inner_radius.z
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-- It's only ok to place it if it's outside our inner ellipse
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place_ok = hx_comp*hx_comp + hy_comp*hy_comp + hz_comp*hz_comp >= 1
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end
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if place_ok then
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data[i] = node_id
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count = count + 1
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end
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end
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i = i + 1
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end
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idx_y_base = idx_y_base + stride_y
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end
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idx_z_base = idx_z_base + stride_z
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end
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-- Save the modified nodes back to disk & return
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worldedit.manip_helpers.finish(manip, data)
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return count
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end
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