.OBJ Data Parser

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This is a script that can make .obj files into a human readable table.

Original code (will not work in roblox)

Parser Source:

The following code will parse and .obj data.

local path = ... .. "."
local loader = {}

function loader.load(source)
	local lines = source:split("\n")

	return loader.parse(lines)
end

function loader.parse(object)
	local obj = {
		v	= {}, -- List of vertices - x, y, z, [w]=1.0
		vt	= {}, -- Texture coordinates - u, v, [w]=0
		vn	= {}, -- Normals - x, y, z
		vp	= {}, -- Parameter space vertices - u, [v], [w]
		f	= {}, -- Faces
	}

	for _, line in ipairs(object) do
		local l = string_split(line, "%s+")
		
		if l[1] == "v" then
			local v = {
				x = tonumber(l[2]),
				y = tonumber(l[3]),
				z = tonumber(l[4]),
				w = tonumber(l[5]) or 1.0
			}
			table.insert(obj.v, v)
		elseif l[1] == "vt" then
			local vt = {
				u = tonumber(l[2]),
				v = tonumber(l[3]),
				w = tonumber(l[4]) or 0
			}
			table.insert(obj.vt, vt)
		elseif l[1] == "vn" then
			local vn = {
				x = tonumber(l[2]),
				y = tonumber(l[3]),
				z = tonumber(l[4]),
			}
			table.insert(obj.vn, vn)
		elseif l[1] == "vp" then
			local vp = {
				u = tonumber(l[2]),
				v = tonumber(l[3]),
				w = tonumber(l[4]),
			}
			table.insert(obj.vp, vp)
		elseif l[1] == "f" then
			local f = {}

			for i=2, #l do
				local split = string_split(l[i], "/")
				local v = {}

				v.v = tonumber(split[1])
				if split[2] ~= "" then v.vt = tonumber(split[2]) end
				v.vn = tonumber(split[3])

				table.insert(f, v)
			end

			table.insert(obj.f, f)
		end
	end

	return obj
end


-- http://wiki.interfaceware.com/534.html
function string_split(s, d)
	local t = {}
	local i = 0
	local f
	local match = '(.-)' .. d .. '()'
	
	if string.find(s, d) == nil then
		return {s}
	end
	
	for sub, j in string.gmatch(s, match) do
		i = i + 1
		t[i] = sub
		f = j
	end
	
	if i ~= 0 then
		t[i+1] = string.sub(s, f)
	end
	
	return t
end

return loader

I know this is not a significant piece of code you will actively use but I am working on a .obj to Union.

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