mirror of https://github.com/captn3m0/Scripts.git
Converts STL files from/to binary <-> ascii formats
This commit is contained in:
parent
016c4595b2
commit
baffd09d63
|
@ -0,0 +1,127 @@
|
|||
#!/usr/bin/env ruby
|
||||
# convertSTL.rb - Converts STL files between binary and ASCII encoding
|
||||
# by Chris Polis
|
||||
#
|
||||
# This script detects which encoding the stl file is in and converts it to
|
||||
# the opposite encoding and saves the file as *-ascii.stl or *-binary.stl.
|
||||
# I wrote this script to save disk space and bandwidth when using stl files.
|
||||
#
|
||||
# USAGE:
|
||||
# $ ruby convertSTL.rb [filename of .stl to be converted]
|
||||
# or 'chmod +x' and run as ./convertSTL.rb
|
||||
#
|
||||
|
||||
|
||||
# Helper methods
|
||||
class Float
|
||||
def to_sn # to scientific notation
|
||||
"%E" % self
|
||||
end
|
||||
|
||||
def self.from_sn str # generate a float from scientific notation
|
||||
("%f" % str).to_f
|
||||
end
|
||||
end
|
||||
|
||||
# Pass in filename as only argument
|
||||
if ARGV.size != 1
|
||||
puts "Usage: ./converSTL.rb [stl filename]"
|
||||
exit
|
||||
end
|
||||
|
||||
# Read file
|
||||
begin
|
||||
original = File.new(ARGV[0], "r")
|
||||
|
||||
# Read first line - check binary or ASCII
|
||||
tempLine = original.gets
|
||||
if tempLine.include? "solid"
|
||||
outFilename = ARGV[0].sub(/\.stl/i, '-binary.stl')
|
||||
puts "#{ARGV[0]} is in ASCII format, converting to BINARY: #{outFilename}"
|
||||
outFile = File.new(outFilename, "w")
|
||||
outFile.write("\0" * 80) # 80 bit header - ignored
|
||||
outFile.write("FFFF") # 4 bit integer # of triangles - filled later
|
||||
triCount = 0
|
||||
|
||||
# ASCII STL format (from Wikipedia):
|
||||
# solid name(optional)
|
||||
#
|
||||
# [foreach triangle]
|
||||
# facet normal ni nj nk
|
||||
# outer loop
|
||||
# vertex v1x v1y v1z
|
||||
# vertex v2x v2y v2z
|
||||
# vertex v3x v3y v3z
|
||||
# endloop
|
||||
# endfacet
|
||||
# endsolid name(optional)
|
||||
|
||||
while temp = original.gets
|
||||
next if temp =~ /^\s*$/ or temp.include? 'endsolid' # ignore whitespace
|
||||
temp.sub! /facet normal/, ''
|
||||
normal = temp.split(' ').map{ |num| Float.from_sn num }
|
||||
triCount += 1
|
||||
temp = original.gets # 'outer loop'
|
||||
|
||||
temp = original.gets
|
||||
vertexA = temp.sub(/vertex/, '').split(' ').map{ |num| Float.from_sn num }
|
||||
temp = original.gets
|
||||
vertexB = temp.sub(/vertex/, '').split(' ').map{ |num| Float.from_sn num }
|
||||
temp = original.gets
|
||||
vertexC = temp.sub(/vertex/, '').split(' ').map{ |num| Float.from_sn num }
|
||||
|
||||
temp = original.gets # 'endsolid'
|
||||
temp = original.gets # 'endfacet'
|
||||
|
||||
outFile.write(normal.pack("FFF"))
|
||||
outFile.write(vertexA.pack("FFF"))
|
||||
outFile.write(vertexB.pack("FFF"))
|
||||
outFile.write(vertexC.pack("FFF"))
|
||||
outFile.write("\0\0")
|
||||
end
|
||||
outFile.seek(80, IO::SEEK_SET)
|
||||
outFile.write([ triCount ].pack("V"))
|
||||
outFile.close
|
||||
|
||||
else
|
||||
outFilename = ARGV[0].sub(/\.stl/i, '-ascii.stl')
|
||||
puts "#{ARGV[0]} is in BINARY format, converting to ASCII: #{outFilename}"
|
||||
outFile = File.new(outFilename, "w")
|
||||
outFile.write("solid \n")
|
||||
|
||||
# Binary STL format (from Wikipedia):
|
||||
# UINT8[80] – Header
|
||||
# UINT32 – Number of triangles
|
||||
#
|
||||
# foreach triangle
|
||||
# REAL32[3] – Normal vector
|
||||
# REAL32[3] – Vertex 1
|
||||
# REAL32[3] – Vertex 2
|
||||
# REAL32[3] – Vertex 3
|
||||
# UINT16 – Attribute byte count
|
||||
# end
|
||||
original.seek(80, IO::SEEK_SET)
|
||||
triCount = original.read(4).unpack('V')[0]
|
||||
triCount.times do |triNdx|
|
||||
normal = original.read(12).unpack('FFF')
|
||||
vertexA = original.read(12).unpack('FFF')
|
||||
vertexB = original.read(12).unpack('FFF')
|
||||
vertexC = original.read(12).unpack('FFF')
|
||||
original.seek(2, IO::SEEK_CUR)
|
||||
|
||||
outFile.write(" facet normal #{normal[0].to_sn} #{normal[1].to_sn} #{normal[2].to_sn}\n")
|
||||
outFile.write(" outer loop\n")
|
||||
outFile.write(" vertex #{vertexA[0].to_sn} #{vertexA[1].to_sn} #{vertexA[2].to_sn}\n")
|
||||
outFile.write(" vertex #{vertexB[0].to_sn} #{vertexB[1].to_sn} #{vertexB[2].to_sn}\n")
|
||||
outFile.write(" vertex #{vertexC[0].to_sn} #{vertexC[1].to_sn} #{vertexC[2].to_sn}\n")
|
||||
outFile.write(" endloop\n")
|
||||
outFile.write(" endfacet\n")
|
||||
end
|
||||
|
||||
outFile.write("endsolid \n")
|
||||
outFile.close
|
||||
end
|
||||
original.close
|
||||
rescue => error
|
||||
puts "Error: #{error}"
|
||||
end
|
Loading…
Reference in New Issue