Created
October 17, 2013 08:23
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Command line quickie to convert binary .3ds files and output ascii .obj file. Materials are ignored.
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v_tot = 1 | |
vqty = 0 | |
file = ARGV.shift | |
f = File.new(file, "rb") | |
while ! f.eof? | |
cid = f.read(2).unpack('s')[0] | |
len = f.read(4).unpack('i')[0] | |
#puts "# len=#{ len.inspect }" | |
case cid | |
when 0x4d4d | |
puts "# MAIN CHUNK" | |
next | |
when 0x3d3d | |
puts "# 3D EDITOR CHUNK" | |
next | |
when 0x4000 | |
puts "# OBJECT BLOCK : " | |
name = "" | |
20.times do | |
c = f.read(1) | |
break if c == "\000" | |
c = c.unpack('C')[0].chr | |
name << c | |
end | |
puts "g #{name}" | |
next | |
when 0x4100 | |
next | |
when 0x4110 | |
print "# VERTICES LIST: " | |
vqty = f.read(2).unpack('s')[0] | |
puts "(#{ vqty.inspect })" | |
vqty.times do | |
x = f.read(4).unpack('f')[0] | |
y = f.read(4).unpack('f')[0] | |
z = f.read(4).unpack('f')[0] | |
str = "v #{x} #{y} #{z}" | |
#print v_tot," " | |
puts str | |
v_tot += 1 | |
end | |
next | |
when 0x4120 | |
print "# FACES" | |
qty = f.read(2).unpack('s')[0] | |
puts "(#{ qty.inspect })" | |
qty.times do | |
a = f.read(2).unpack('s')[0] | |
b = f.read(2).unpack('s')[0] | |
c = f.read(2).unpack('s')[0] | |
flags = f.read(2).unpack('s')[0] | |
str = "f #{v_tot-vqty+a} #{v_tot-vqty+b} #{v_tot-vqty+c}" | |
puts str | |
end | |
next | |
else | |
f.seek(len-6, IO::SEEK_CUR) | |
end | |
end | |
f.close |
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