119 lines
4.3 KiB
Lua
119 lines
4.3 KiB
Lua
local wea_c = worldeditadditions_core
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local Vector3 = wea_c.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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--- Creates a spline that follows the given list of points.
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-- @param pos_list Vector3[] The list of points that define the path the spline should follow. Minimum: 2
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-- @param width_start number The width of the spline at the start.
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-- @param width_end number The width of the spline at the end. If nil, then width_start is used.
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-- @param steps number The number of smoothing passes to apply to the list of points.
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-- @param target_node Vector3 The *normalised* name of the node to use to build the square spiral with.
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-- @returns bool,number|string A success boolean value, followed by either the number of the nodes set or an error message string.
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function worldeditadditions.spline(pos_list, width_start, width_end, steps, target_node)
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if #pos_list < 2 then return false, "Error: At least 2 positions are required to make a spline." end
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if not width_end then width_end = width_start end
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---
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-- 0: Find bounding box
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---
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-- We can't use wea_c.pos.get_bounds 'cause that requires a player name
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local pos1, pos2 = pos_list[1], pos_list[2]
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for _, pos in pairs(pos_list) do
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pos1, pos2 = Vector3.expand_region(pos, pos1, pos2)
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end
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local max_width = math.max(width_start, width_end)
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pos1 = pos1 - max_width
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pos2 = pos2 + max_width
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---
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-- 1: Interpolate points & widths
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---
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local pos_list_chaikin = wea_c.chaikin(pos_list, steps)
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local widths_lerped = {}
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for i = 1, #pos_list_chaikin do
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table.insert(
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widths_lerped,
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wea_c.lerp(width_start, width_end, (1/#pos_list_chaikin)*(i-1))
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)
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end
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---
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-- 2: Fetch VoxelManipulator, prepare for replacement
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---
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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 = minetest.get_content_id(target_node)
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local count = 0 -- The number of nodes replaced
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---
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-- 3: Replace nodes
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---
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local pos_prev = pos_list_chaikin[1]:floor()
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local width_prev = widths_lerped[1]
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for i = 2, #pos_list_chaikin do
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local pos_next = pos_list_chaikin[i]:floor()
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local width_next = widths_lerped[i]
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-- For now, just plot a point at each node
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data[area:indexp(pos_next)] = node_id
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data[area:indexp(pos_prev)] = node_id
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local subline_length = (pos_next - pos_prev):length()
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print("DEBUG:spline DRAW pos", pos_next, "width", width_next, "length", subline_length)
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if subline_length > 0 then
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-- Iterate a box around the subline and draw it
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local width_max = math.ceil(math.max(width_prev, width_next))
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local subpos1, subpos2 = Vector3.sort(pos_next, pos_prev)
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subpos1 = subpos1 - width_max
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subpos2 = subpos2 + width_max
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print("subpos1", subpos1, "subpos2", subpos2, "width_prev", width_prev, "width_next", width_next)
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for z = subpos2.z, subpos1.z, -1 do
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for y = subpos2.y, subpos1.y, -1 do
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for x = subpos2.x, subpos1.x, -1 do
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local here = Vector3.new(x, y, z)
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local D = (pos_next - pos_prev):normalise()
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local d = Vector3.dot(here - pos_prev, D)
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local closest_on_line = pos_prev + (D * d)
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local distance = (here - closest_on_line):length()
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local distance_to_prev = (closest_on_line - pos_prev):length()
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local percentage_along_line = distance_to_prev / subline_length
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local width_here = wea_c.lerp(width_prev, width_next, percentage_along_line)
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if distance < width_here then
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-- print("POINT ", here, "width_here", width_here, "distance from line", distance)
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data[area:indexp(here)] = node_id
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-- May hit some nodes multiplle times, but there's nothing doing about that without a big performance (and/or memory) hit
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count = count + 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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pos_prev = pos_next:clone()
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width_prev = width_next
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end
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end
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---
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-- 4: Save changes and return
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---
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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, count
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end
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