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65 lines
2.3 KiB
65 lines
2.3 KiB
local math, ipairs, tostring |
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= math, ipairs, tostring |
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local minetest, vector, include |
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= minetest, vector, include |
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local function debug_tell(...) |
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local text = "" |
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for _, v in ipairs({...}) do text = text .. tostring(v) end |
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minetest.chat_send_all(text) |
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end |
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local AXIS_LOOKUP = { |
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vector.new( 0, 1, 0), -- +Y |
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vector.new( 0, 0, 1), -- +Z |
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vector.new( 0, 0, -1), -- -Z |
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vector.new( 1, 0, 0), -- +X |
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vector.new(-1, 0, 0), -- -X |
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vector.new( 0, -1, 0), -- -Y |
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} |
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local function unit_vector_to_axis_index(vec) |
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if vec.y == 1 then if vec.x == 0 and vec.z == 0 then return 1 end |
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elseif vec.z == 1 then if vec.x == 0 and vec.y == 0 then return 2 end |
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elseif vec.z == -1 then if vec.x == 0 and vec.y == 0 then return 3 end |
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elseif vec.x == 1 then if vec.y == 0 and vec.z == 0 then return 4 end |
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elseif vec.x == -1 then if vec.y == 0 and vec.z == 0 then return 5 end |
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elseif vec.y == -1 then if vec.x == 0 and vec.z == 0 then return 6 end |
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end |
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error("Not a unit vector") |
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end |
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local FACEDIR_LOOKUP = {} |
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for up_index, up in ipairs(AXIS_LOOKUP) do |
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FACEDIR_LOOKUP[up_index] = {} |
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for rot = 0, 3 do |
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local facedir = (up_index - 1) * 4 + rot |
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local back = minetest.facedir_to_dir(facedir) |
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local back_index = unit_vector_to_axis_index(back) |
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FACEDIR_LOOKUP[up_index][back_index] = facedir |
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end |
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end |
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minetest.register_on_punchnode(function(pos, node, puncher, pointed_thing) |
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local def = minetest.registered_nodes[node.name] |
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if def.paramtype2 == "facedir" and pointed_thing.above and pointed_thing.under then |
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local facedir = node.param2 |
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-- Vector that points away from the punched face. |
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local punched_face = vector.subtract(pointed_thing.above, pointed_thing.under) |
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local up = AXIS_LOOKUP[1 + math.floor(facedir / 4)] |
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local back = minetest.facedir_to_dir(facedir) |
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up = up:rotate_around_axis(punched_face, math.rad(-90)):round() |
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back = back:rotate_around_axis(punched_face, math.rad(-90)):round() |
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local up_index = unit_vector_to_axis_index(up) |
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local back_index = unit_vector_to_axis_index(back) |
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facedir = FACEDIR_LOOKUP[up_index][back_index] |
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if facedir == nil then minetest.chat_send_all("Could not look up facedir") end |
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node.param2 = facedir |
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minetest.set_node(pos, node) |
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end |
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end)
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