mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-11-16 04:53:00 +00:00
Starbeamrainbowlabs
3311d80a2a
We need a way of defining metaballs per-player. Our solution to this is a custom in-memory per-player storage system. The reason for this is because just a position (e.g. that provided by pos1/pos2) is not enough - we need a radius as well.
66 lines
2.6 KiB
Lua
66 lines
2.6 KiB
Lua
local wea = worldeditadditions
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local Vector3 = wea.Vector3
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-- ███ ███ ███████ ████████ █████ ██████ █████ ██ ██ ███████
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-- ████ ████ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██ ████ ██ █████ ██ ███████ ██████ ███████ ██ ██ ███████
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-- ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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-- ██ ██ ███████ ██ ██ ██ ██████ ██ ██ ███████ ███████ ███████
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--- Renders 2 or more metaballs with the given node and threshold value.
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-- direction the point should point.
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-- @param metaballs [{pos: Vector3, radius: number}] Aa list of metaballs to render. Each metaball should be a table with 2 properties: pos - the position of the centre of the metaball as a Vector3, and radius - the radius of the metaball.
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-- @param replace_node string The fully qualified name of the node to use to make the dome with.
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local function render(metaballs, replace_node, threshold)
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local pos1, pos2
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if not threshold then threshold = 1 end
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for i,metaball in ipairs(metaballs) do
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local pos1_c = metaball.pos - metaball.radius
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local pos2_c = metaball.pos + metaball.radius
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if i == 1 then
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pos1 = pos1_c
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pos2 = pos2_c
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end
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pos1 = Vector3.min(pos1, pos1_c)
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pos2 = Vector3.max(pos2, pos2_c)
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end
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-- pos2 will always have the highest co-ordinates now
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-- Fetch the nodes in the specified area
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local manip, area = worldedit.manip_helpers.init(pos1, pos2)
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local data = manip:get_data()
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local node_id_replace = minetest.get_content_id(replace_node)
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local replaced = 0
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for z = pos2.z, pos1.z, -1 do
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for y = pos2.y, pos1.y, -1 do
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for x = pos2.x, pos1.x, -1 do
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local pos_here = Vector3.new(x, y, z)
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local metaball_sum = 0
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for i,metaball in ipairs(metaballs) do
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local distance_sq = (metaball.pos - pos_here):length_squared()
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local radius_sq = metaball.radius * metaball.radius
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local falloff = (1 / (distance_sq/radius_sq)) ^ 2
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metaball_sum = metaball_sum + falloff
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end
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if metaball_sum <= threshold then
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data[area:index(x, y, z)] = node_id_replace
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replaced = replaced + 1
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end
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end
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end
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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 true, replaced
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end
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return render
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