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//erode: initial river algorithm implementation
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2 changed files with 115 additions and 2 deletions
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@ -24,14 +24,27 @@ function worldeditadditions.erode.run(pos1, pos2, algorithm, params)
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-- worldeditadditions.format.array_2d(heightmap, heightmap_size.x)
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local success, msg, stats
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if algorithm == "snowballs" then
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success, msg = worldeditadditions.erode.snowballs(heightmap, heightmap_eroded, heightmap_size, region_height, params)
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success, msg = worldeditadditions.erode.snowballs(
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heightmap, heightmap_eroded,
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heightmap_size,
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region_height,
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params
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)
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if not success then return success, msg end
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elseif algorithm == "river" then
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success, msg = worldeditadditions.erode.river(
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heightmap, heightmap_eroded,
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heightmap_size,
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region_height,
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params
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)
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if not success then return success, msg end
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else
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-- FUTURE: Add a new "river" algorithm here that:
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-- * Fills in blocks that are surrounded on more than 3 horizontal sides
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-- * Destroys blocks that have no horizontal neighbours
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-- A bit like cellular automata actually.
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return false, "Error: Unknown algorithm '"..algorithm.."'. Currently implemented algorithms: snowballs (2d; hydraulic-like). Ideas for algorithms to implement are welcome!"
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return false, "Error: Unknown algorithm '"..algorithm.."'. Currently implemented algorithms: snowballs (2d; hydraulic-like), river (2d; cellular automata-like; fills potholes and lowers towers). Ideas for algorithms to implement are welcome!"
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end
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success, stats = worldeditadditions.apply_heightmap_changes(
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100
worldeditadditions/lib/erode/river.lua
Normal file
100
worldeditadditions/lib/erode/river.lua
Normal file
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@ -0,0 +1,100 @@
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local wea = worldeditadditions
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--- Parses a comma-separated side numbers list out into a list of numbers.
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-- @param list string The command separated list to parse.
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-- @returns number[] A list of side numbers.
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local function parse_sides_list(list)
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list = list:gsub("%s", "") -- Spaces are not permitted
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return wea.table_unique(wea.table_map(
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wea.split(list, ","),
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function(value) return tonumber(value) end
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))
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end
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function worldeditadditions.erode.river(heightmap_initial, heightmap, heightmap_size, region_height, params_custom)
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local params = {
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steps = 1, -- Number of rounds/passes of the algorithm to run
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remove_sides = "0,1", -- Cells with this many adjacent horizontal neighbours will be removed
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fill_sides = "4,3" -- Cells with this many adjaect horizontal neighbours will be filled in
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}
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-- Apply the custom settings
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wea.table_apply(params_custom, params)
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params.remove_sides = parse_sides_list(params.remove_sides)
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params.fill_sides = parse_sides_list(params.fill_sides)
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local timings = {}
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local filled = 0
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local removed = 0
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for i=1,params.steps do
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local time_start = wea.get_ms_time()
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for z = heightmap_size.z - 1, 0, -1 do
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for x = heightmap_size.x - 1, 0, -1 do
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local hi = z*heightmap_size.x + x
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local thisheight = heightmap[hi]
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local sides = 0
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local adjacent_heights = { }
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if x > 0 then
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table.insert(adjacent_heights, heightmap[z*heightmap_size.x + x-1])
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if heightmap[z*heightmap_size.x + x-1] >= thisheight then
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sides = sides + 1
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end
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end
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if x < heightmap_size.x - 1 then
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table.insert(adjacent_heights, heightmap[z*heightmap_size.x + x+1])
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if heightmap[z*heightmap_size.x + x+1] >= thisheight then
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sides = sides + 1
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end
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end
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if z > 0 then
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table.insert(adjacent_heights, heightmap[(z-1)*heightmap_size.x + x])
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if heightmap[(z-1)*heightmap_size.x + x] >= thisheight then
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sides = sides + 1
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end
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end
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if z < heightmap_size.z - 1 then
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table.insert(adjacent_heights, heightmap[(z+1)*heightmap_size.x + x])
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if heightmap[(z+1)*heightmap_size.x + x] >= thisheight then
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sides = sides + 1
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end
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end
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local action = "none"
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for i,sidecount in ipairs(params.fill_sides) do
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if sidecount == sides then
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action = "fill"
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break
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end
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end
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for i,sidecount in ipairs(params.remove_sides) do
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if sidecount == sides then
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action = "remove"
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break
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end
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end
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if action == "fill" then
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local above_us = wea.table_filter(adjacent_heights,
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function(height) return height > thisheight end
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)
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local above_us_next = wea.min(above_us)
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heightmap[hi] = above_us_next
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filled = filled + 1
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elseif action == "remove" then
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local below_us = wea.table_filter(adjacent_heights,
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function(height) return height < thisheight end
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)
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local below_us_next = wea.max(below_us)
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heightmap[hi] = below_us_next
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removed = removed + 1
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end
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end
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end
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table.insert(timings, wea.get_ms_time() - time_start)
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end
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return true, params.steps.." steps made, raising "..filled.." and lowering "..removed.." columns in "..wea.format.human_time(wea.sum(timings)).." (~"..wea.format.human_time(wea.average(timings)).." per step)"
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end
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