mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-11-01 05:43:01 +00:00
93 lines
3 KiB
Lua
93 lines
3 KiB
Lua
local wea_c = worldeditadditions_core
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-- ███████ █████ ██████ ███████
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-- ██ ██ ██ ██ ██
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-- █████ ███████ ██ █████
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-- ██ ██ ██ ██ ██
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-- ██ ██ ██ ██████ ███████
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--- A single face of a Mesh.
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-- @class worldeditadditions_core.Face
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local Face = {}
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Face.__index = Face
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--- Creates a new face from a list of vertices.
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-- The list of vertices should be anti-clockwise.
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-- @param vertices Vector3[] A list of Vector3 vertices that define the face.
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function Face.new(vertices)
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local result = { vertices = vertices }
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setmetatable(result, Face)
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return result
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end
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--- Determines whether this face is equal to another face or not.
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-- @param a Face The first face to compare.
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-- @param b Face The second face to compare.
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-- @returns bool Whether the 2 faces are equal or not.
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function Face.equal(a, b)
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if #a.vertices ~= #b.vertices then return false end
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for i,vertex in ipairs(a) do
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if vertex ~= b.vertices[i] then return false end
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end
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return true
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end
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function Face.__eq(a, b) return Face.equal(a, b) end
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-- ███ ███ ███████ ███████ ██ ██
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-- ████ ████ ██ ██ ██ ██
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-- ██ ████ ██ █████ ███████ ███████
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-- ██ ██ ██ ██ ██ ██ ██
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-- ██ ██ ███████ ███████ ██ ██
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--- A mesh of faces.
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-- @class worldeditadditions_core.Mesh
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local Mesh = {}
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Mesh.__index = Mesh
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--- Creates a new empty mesh object container.
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-- @returns Mesh
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function Mesh.new()
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local result = { faces = {} }
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setmetatable(result, Mesh)
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end
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--- Adds a face to this mesh.
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-- @param self Mesh The mesh instance to operate on.
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-- @param face Face The face to add.
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-- @returns void
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function Mesh.add_face(self, face)
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table.insert(self.faces, face)
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end
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--- Deduplicate the list of faces in this Mesh.
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-- Removes all faces that are exactly equal to one another. This reduces the
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-- filesize.
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-- @returns number The number of faces removed.
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function Mesh.dedupe(self)
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-- Find the faces to remove
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local toremove = {}
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for i,face_check in ipairs(self.faces) do
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for j,face_next in ipairs(self.faces) do
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if i ~= j -- If we're not comparing a face to itself...
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and face_check == face_next -- ....and the 2 faces are equal....
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and not wea_c.table.contains(toremove, j) then -- ...and we haven't already marked it for removal...
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-- Mark it for removal
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table.insert(toremove, j)
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end
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end
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end
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-- Sort the list of indexes marked for removal from largest to smallest
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-- This way, removing smaller items doesn't alter the index of larger ones
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table.sort(toremove, function(a, b) return a > b end)
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-- Remove the faces marked for removal
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for i, remove_index in ipairs(toremove) do
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table.remove(self.faces, remove_index)
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end
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return #toremove
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end
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return Mesh, Face
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