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Starbeamrainbowlabs
fd5804dd9c
Specifically, I'm unsure about whether I'm happy with the effects of the algorithm. Also, we convolve with a 3x3 gaussian kernel after erosion is complete - and we have verified that the erosion is having an positive effect at "roughening up" a terrain surface. It seems like the initial blog post was correct: the algorithm does tend to make steep surfaces steeper. It also appears that it's more effective on larger areas, and 'gentler' curves. THis might be because the surface normals are more conducive to making the snowballs roll. Finally, we need to decide whether we want to keep the precomputed normals as we have now, or whether we want to dynamically compute them at the some of request.
43 lines
1.5 KiB
Lua
43 lines
1.5 KiB
Lua
worldeditadditions.erode = {}
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dofile(worldeditadditions.modpath.."/lib/erode/snowballs.lua")
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function worldeditadditions.erode.run(pos1, pos2, algorithm, params)
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pos1, pos2 = worldedit.sort_pos(pos1, pos2)
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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 heightmap_size = {}
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heightmap_size[0] = (pos2.z - pos1.z) + 1
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heightmap_size[1] = (pos2.x - pos1.x) + 1
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local region_height = (pos2.y - pos1.y) + 1
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local heightmap = worldeditadditions.make_heightmap(pos1, pos2, manip, area, data)
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local heightmap_eroded = worldeditadditions.shallowcopy(heightmap)
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-- print("[erode.run] algorithm: "..algorithm..", params:");
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-- print(worldeditadditions.map_stringify(params))
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worldeditadditions.print_2d(heightmap, heightmap_size[1])
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if algorithm == "snowballs" then
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local success, msg = worldeditadditions.erode.snowballs(heightmap, heightmap_eroded, heightmap_size, region_height, params)
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if not success then return success, msg end
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else
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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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end
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local success, stats = worldeditadditions.apply_heightmap_changes(
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pos1, pos2, area, data,
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heightmap, heightmap_eroded, heightmap_size
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)
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if not success then return success, stats end
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worldedit.manip_helpers.finish(manip, data)
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print("[erode] stats")
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print(worldeditadditions.map_stringify(stats))
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return true, stats
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end
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