58 lines
2.1 KiB
Lua
58 lines
2.1 KiB
Lua
local mlvec = modlib.vector
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local media_paths = epidermis.media_paths
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local bad_character_b3d_path = modlib.mod.get_resource"character_without_normals.b3d"
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local bad_character_b3d_hash = minetest.sha1(modlib.file.read(bad_character_b3d_path))
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local fixed_character_b3d_path = modlib.mod.get_resource"character_with_normals.b3d"
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return setmetatable({}, {__index = function(self, filename)
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local _, ext = modlib.file.get_extension(filename)
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if not ext or ext:lower() ~= "b3d" then
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-- Only B3D support currently
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return
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end
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local path = assert(media_paths[filename], filename)
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-- HACK replace a "bad" character.b3d with a fixed version that includes normals
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-- Susceptible to SHA1 collisions, but so is MT's media loading process
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-- See https://github.com/minetest/minetest_game/pull/2902
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if filename == "character.b3d" and minetest.sha1(modlib.file.read(path)) == bad_character_b3d_hash then
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path = fixed_character_b3d_path
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end
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local model = io.open(path, "rb")
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local character = assert(modlib.b3d.read(model))
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assert(not model:read(1))
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model:close()
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local mesh = assert(character.node.mesh)
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local vertices = assert(mesh.vertices)
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for _, vertex in ipairs(vertices) do
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-- Minetest hardcodes a blocksize of 10 model units
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vertex.pos = mlvec.divide_scalar(vertex.pos, 10)
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end
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-- Triangle sets by texture index
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local tris_by_tex = {}
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local func = modlib.func
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for _, set in pairs(assert(mesh.triangle_sets)) do
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local tris = set.vertex_ids
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for _, tri in pairs(tris) do
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modlib.table.map(tri, func.curry(func.index, vertices))
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tri.poses = {tri[1].pos, tri[2].pos, tri[3].pos}
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end
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local brush_id = tris.brush_id or mesh.brush_id
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local tex_id
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if brush_id then
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tex_id = assert(character.brushes[brush_id].texture_id[1])
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else
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-- No brush, default to first texture
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tex_id = 1
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end
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tris_by_tex[tex_id] = tris_by_tex[tex_id] and modlib.table.append(tris_by_tex[tex_id], tris) or tris
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end
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self[filename] = {
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vertices = vertices,
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triangle_sets = tris_by_tex,
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frames = (character.node.animation or {}).frames or 1
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}
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return self[filename]
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end})
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