331 lines
17 KiB
Python
331 lines
17 KiB
Python
#!/usr/bin/env python3
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'''
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(C) 2018 Juergen Weigert <juergen@fabmail.org>, distribute under GPLv2 or ask
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This is an input extension for inkscape to read STL files.
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Requires: (python-lxml | python3-lxml), slic3r
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For optional(!) rotation support:
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Requires: (python-numpy-stl | python3-numpy-stl)
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If you get ImportError: cannot import name 'mesh'
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although an stl module is installed, then you have the wrong stl module.
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Try 'pip3 uninstall stl; pip3 install numpy-stl'
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2018-12-22 jw, v0.1 Initial draught
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v0.1 First working standalone tool.
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2018-12-26 jw, v0.3 Mesh rotation support via numpy-stl. Fully optional.
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v0.4 Works fine as an inkscape input extension under Linux.
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2019-03-01 jw, v0.5 numbers and center option added.
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2019-07-17 jw, v0.6 fixed ry rotation.
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2021-05-14 - Mario Voigt:
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- changed extension to support ply,off,obj,stl by using OpenMesh
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- moved extension to sub menu structure (allows preview)
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- added different options
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#Notes
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* requires exactly Slic3r-1.3.1-dev
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-> https://dl.slic3r.org/dev/linux/
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-> https://dl.slic3r.org/dev/win/
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* Make it available through PrusaSlic3r? > this is not possible because no support to slice into SVG layers
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#ToDos
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* FIXME: should use svg_pathstats(path_d): to compute bounding boxes.
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'''
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import sys
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import os
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import re
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import subprocess
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from lxml import etree
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from subprocess import Popen, PIPE
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import inkex
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from inkex import Color, Transform
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import tempfile
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import openmesh as om
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sys_platform = sys.platform.lower()
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if sys_platform.startswith('win'):
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slic3r = 'slic3r-console.exe'
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elif sys_platform.startswith('darwin'):
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slic3r = 'slic3r'
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else: # Linux
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slic3r = os.environ['HOME']+ '/Downloads/Slic3r-1.3.1-dev-x86_64.AppImage'
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if not os.path.exists(slic3r):
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slic3r = 'slic3r'
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class InputSTL(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument('--tab')
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pars.add_argument('--inputfile', help='STL input file to convert to SVG with the same name, but ".svg" suffix.')
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pars.add_argument('--scalefactor', type=float, default=1.0, help='Scale the model to custom size')
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pars.add_argument("--max_num_faces", type=int, default=200, help="If the STL file has too much detail it contains a large number of faces. This will make processing extremely slow. So we can limit it.")
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pars.add_argument('-l', '--layer_height', type=float, default=1.000, help='slic3r layer height, probably in mm. Default: per slic3r config')
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pars.add_argument('--rx', type=float, default=None, help='Rotate STL object around X-Axis before importing.')
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pars.add_argument('--ry', type=float, default=None, help='Rotate STL object around Y-Axis before importing.')
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pars.add_argument('--rz', type=float, default=None, help='Rotate STL object around Z-Axis before importing.')
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pars.add_argument('--numbers', type=inkex.Boolean, default=False, help='Add layer numbers.')
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pars.add_argument('--center', type=inkex.Boolean, default=False, help='Add center marks.')
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pars.add_argument("--resizetoimport", type=inkex.Boolean, default=True, help="Resize the canvas to the imported drawing's bounding box")
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pars.add_argument("--extraborder", type=float, default=0.0)
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pars.add_argument("--extraborder_units")
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pars.add_argument("--stroke_width", type=float, default=2.0, help="Stroke width (px)")
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pars.add_argument('--path_color', type=Color, default='879076607', help="Path color")
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pars.add_argument("--use_path_color", type=inkex.Boolean, default=True, help="Use path color")
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pars.add_argument("--fill_color", type=Color, default='1943148287', help="Fill color")
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pars.add_argument("--use_fill_color", type=inkex.Boolean, default=False, help="Use fill color")
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pars.add_argument("--tone_down", default="regular", help="Town down opacity for each layer")
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pars.add_argument('-s', '--slic3r-cmd', '--slic3r_cmd', default="slic3r", help="Command to invoke slic3r.")
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def effect(self):
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args = self.options
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#############################################
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# test slic3r command
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#############################################
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if sys_platform.startswith('win'):
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# assert we run the commandline version of slic3r
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args.slic3r_cmd = re.sub('slic3r(\.exe)?$', 'slic3r-console.exe', args.slic3r_cmd, flags=re.I)
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cmd = [args.slic3r_cmd, '--version']
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try:
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proc = subprocess.Popen(cmd, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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except OSError as e:
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hint="Maybe use --slic3r-cmd option?"
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inkex.utils.debug("{0}\nCommand failed: errno={1} {2}\n\n{3}".format(' '.join(cmd), e.errno, e.strerror, hint), file=sys.stderr)
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sys.exit(1)
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stdout, stderr = proc.communicate()
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#############################################
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# prepare STL input (also accept and convert obj, stl, ply, off)
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#############################################
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outputfilebase = os.path.splitext(os.path.basename(args.inputfile))[0]
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converted_inputfile = os.path.join(tempfile.gettempdir(), outputfilebase + ".stl")
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if not os.path.exists(args.inputfile):
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inkex.utils.debug("The input file does not exist.")
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exit(1)
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input_mesh = om.read_trimesh(args.inputfile)
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if input_mesh.n_faces() > args.max_num_faces:
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inkex.utils.debug("Aborted. Target STL file has " + str(input_mesh.n_faces()) + " faces, but only " + str(args.max_num_faces) + " are allowed.")
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exit(1)
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om.write_mesh(converted_inputfile, input_mesh) #read + convert, might throw errors; warning. output is ASCII but cannot controlled to be set to binary because om.Options() is not available in python binding yet
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if not os.path.exists(converted_inputfile):
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inkex.utils.debug("The converted input file does not exist.")
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exit(1)
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args.inputfile = converted_inputfile #overwrite
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#############################################
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# create the layer slices
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#############################################
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svgfile = re.sub('\.stl', '.svg', args.inputfile, flags=re.IGNORECASE)
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# option --layer-height does not work. We use --scale instead...
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scale = 1.0 / args.layer_height
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cmd = [args.slic3r_cmd, '--no-gui', '--scale', str(scale), '--rotate-x', str(args.rx), '--rotate-y', str(args.ry), '--rotate', str(args.rz), '--first-layer-height', '0.1mm', '--export-svg', '-o', svgfile, args.inputfile]
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magic = 10 # layer width seems to be 0.1mm ???
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def scale_points(pts, scale):
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""" str='276.422496,309.4 260.209984,309.4 260.209984,209.03 276.422496,209.03' """
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return re.sub('\d*\.\d*', lambda x: str(float(x.group(0))*scale*magic), pts)
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## CAUTION: keep svg_pathstats() in sync with inkscape-centerlinetrace
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def svg_pathstats(path_d):
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""" calculate statistics from an svg path:
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length (measuring bezier splines as straight lines through the handles).
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points (all, including duplicates)
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segments (number of not-connected!) path segments.
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simple bounding box (ignoring curves of splines, but inclding handles.)
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"""
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xmin = 1e99
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ymin = 1e99
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xmax = -1e99
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ymax = -1e99
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p_points = 0
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p_length = 0
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p_segments = 0
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path_d = path_d.lower()
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for p in path_d.split('m'):
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pp = re.sub('[cl,]', ' ', p)
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pp,closed = re.subn('z\s*$','',pp)
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xy = pp.split()
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if len(xy) < 2:
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# inkex.utils.debug(len(pp))
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# inkex.utils.debug("short path error")
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continue
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x0 = float(xy[0])
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y0 = float(xy[1])
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if x0 > xmax: xmax = x0
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if x0 < xmin: xmin = x0
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if y0 > ymax: ymax = y0
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if y0 < ymin: ymin = y0
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p_points += 1
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x = xy[2::2]
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y = xy[3::2]
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if len(x):
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p_segments += 1
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if closed:
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x.extend(x0)
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y.extend(y0)
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for i in range(len(x)):
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p_points += 1
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dx = float(x[i]) - x0
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dy = float(y[i]) - y0
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p_length += math.sqrt( dx * dx + dy * dy )
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x0,y0 = float(x[i]),float(y[i])
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if x0 > xmax: xmax = x0
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if x0 < xmin: xmin = x0
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if y0 > ymax: ymax = y0
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if y0 < ymin: ymin = y0
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return { 'points':p_points, 'segments':p_segments, 'length':p_length, 'bbox': (xmin,ymin, xmax, ymax) }
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def bbox_info(slic3r, file):
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cmd = [ slic3r, '--no-gui', '--info', file ]
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p = Popen(cmd, stdout=PIPE, stderr=PIPE)
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out, err = p.communicate()
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if len(err):
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raise ValueError(err)
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bb = {}
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for l in out.decode().split("\n"):
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m = re.match('((min|max)_[xyz])\s*=\s*(.*)', l)
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if m: bb[m.group(1)] = float(m.group(3))
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if (len(bb) != 6):
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raise ValueError("slic3r --info did not return 6 elements for bbox")
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return bb
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if args.center is not False:
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bb = bbox_info(args.slic3r_cmd, args.inputfile)
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# Ouch: bbox info gives us stl coordinates. slic3r translates them into svg px using 75dpi.
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cx = (-bb['min_x'] + bb['max_x']) * 0.5 * 1/scale * magic * 25.4 / 75
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cy = (-bb['min_y'] + bb['max_y']) * 0.5 * 1/scale * magic * 25.4 / 75
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try:
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proc = subprocess.Popen(cmd, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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except OSError as e:
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raise OSError("{0}\nCommand failed: errno={1} {2}".format(' '.join(cmd), e.errno, e.strerror))
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stdout, stderr = proc.communicate()
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if not b'Done.' in stdout:
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inkex.utils.debug("Command failed: {0}".format(' '.join(cmd)))
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inkex.utils.debug("OUT: " + str(stdout))
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inkex.utils.debug("ERR: " + str(stderr))
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sys.exit(1)
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# slic3r produces correct svg files, but with polygons instead of paths, and with undefined strokes.
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# When opened with inkscape, most lines are invisible and polygons cannot be edited.
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# To fix these issues, we postprocess the svg file:
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# * replace polygon nodes with corresponding path nodes.
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# * replace style attribute in polygon nodes with one that has a black stroke
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stream = open(svgfile, 'r')
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p = etree.XMLParser(huge_tree=True)
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doc = etree.parse(stream, parser=p)
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stream.close()
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## To change the document units to mm, insert directly after the root node:
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# e.tag = '{http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd}namedview'
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# e.attrib['id'] = "base"
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# e.attrib['{http://www.inkscape.org/namespaces/inkscape}document-units'] = "mm"
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layercount = 0
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for e in doc.iterfind('//{*}g'):
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if e.attrib['{http://slic3r.org/namespaces/slic3r}z'] and e.attrib['id']:
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e.attrib['{http://www.inkscape.org/namespaces/inkscape}label'] = e.attrib['id'] + ' slic3r:z=' + e.attrib['{http://slic3r.org/namespaces/slic3r}z']
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del e.attrib['{http://slic3r.org/namespaces/slic3r}z']
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# for some fun with our inkscape-paths2openscad extension, add sibling to e:
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# <svg:desc id="descpoly60">Depth: 1mm\nOffset: 31mm</svg:desc>
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desc = etree.Element('{http://www.w3.org/2000/svg}desc')
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desc.attrib['id'] = 'descl'+str(layercount)
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desc.text = "Depth: %.2fmm\nRaise: %.2fmm\n" % (1/scale, layercount/scale)
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e.append(desc)
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layercount+=1
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if args.numbers is True:
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num = etree.Element('{http://www.w3.org/2000/svg}text')
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num.attrib['id'] = 'textnum'+str(layercount)
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num.attrib['x'] = str(layercount*2)
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num.attrib['y'] = str(layercount*4+10)
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num.attrib['style'] = 'fill:#00FF00;fill-opacity:1;stroke:#00FF00;font-family:FreeSans;font-size:10pt;stroke-opacity:1;stroke-width:0.1'
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num.text = "%d" % layercount
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e.append(num)
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if args.center is True:
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cc = etree.Element('{http://www.w3.org/2000/svg}path')
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cc.attrib['id'] = 'ccross'+str(layercount)
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cc.attrib['style'] = 'fill:none;fill-opacity:1;stroke:#0000FF;font-family:FreeSans;font-size:10pt;stroke-opacity:1;stroke-width:0.1'
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cc.attrib['d'] = 'M %s,%s v 10 M %s,%s h 10 M %s,%s h 4' % (cx, cy-5, cx-5, cy, cx-2, cy+5)
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e.append(cc)
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totalPolygoncount = 0
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for e in doc.iterfind('//{*}polygon'):
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totalPolygoncount += 1
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polygoncount = 0
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if args.use_fill_color is False:
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fill = "none"
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else:
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fill = args.fill_color
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for e in doc.iterfind('//{*}polygon'):
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polygoncount += 1
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if args.tone_down == "front_to_back":
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stroke_and_fill_opacity = 1 - (polygoncount / totalPolygoncount)
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elif args.tone_down == "back_to_front":
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stroke_and_fill_opacity = polygoncount / totalPolygoncount
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elif args.tone_down == "regular":
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stroke_and_fill_opacity = 1.0
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else:
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inkex.utils.debug("Error: unkown town down option")
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exit(1)
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if args.use_path_color is False:
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stroke = ""
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else:
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stroke = "stroke:{}".format(args.path_color)
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# e.tag = '{http://www.w3.org/2000/svg}polygon'
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# e.attrib = {'{http://slic3r.org/namespaces/slic3r}type': 'contour', 'points': '276.422496,309.4 260.209984,309.4 260.209984,209.03 276.422496,209.03', 'style': 'fill: white'}
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e.tag = re.sub('polygon$', 'path', e.tag)
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e.attrib['id'] = 'polygon%d' % polygoncount
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e.attrib['{http://www.inkscape.org/namespaces/inkscape}connector-curvature'] = '0'
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e.attrib['style'] = 'fill:{};fill-opacity:{};{};stroke-opacity:{};stroke-width:{}'.format(fill, stroke_and_fill_opacity, stroke, stroke_and_fill_opacity, args.stroke_width)
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e.attrib['d'] = 'M ' + re.sub(' ', ' L ', scale_points(e.attrib['points'], 1/scale)) + ' Z'
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del e.attrib['points']
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if e.attrib.get('{http://slic3r.org/namespaces/slic3r}type') == 'contour':
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# remove contour, but keep all slic3r:type='hole', whatever it is worth later.
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del e.attrib['{http://slic3r.org/namespaces/slic3r}type']
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etree.cleanup_namespaces(doc.getroot(), top_nsmap={
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'inkscape': 'http://www.inkscape.org/namespaces/inkscape',
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'sodipodi': 'http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd'})
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#inkex.utils.debug("{0}: {1} polygons in {2} layers converted to paths.".format(svgfile, polygoncount, layercount))
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stl_group = self.document.getroot().add(inkex.Group(id=self.svg.get_unique_id("slic3r-stl-input-"))) #make a new group at root level
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for element in doc.getroot().iter("{http://www.w3.org/2000/svg}g"):
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stl_group.append(element)
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#apply scale factor
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translation_matrix = [[args.scalefactor, 0.0, 0.0], [0.0, args.scalefactor, 0.0]]
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stl_group.transform = Transform(translation_matrix) * stl_group.transform
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#adjust canvas to the inserted unfolding
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if args.resizetoimport:
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bbox = stl_group.bounding_box()
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namedView = self.document.getroot().find(inkex.addNS('namedview', 'sodipodi'))
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root = self.svg.getElement('//svg:svg');
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offset = self.svg.unittouu(str(args.extraborder) + args.extraborder_units)
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root.set('viewBox', '%f %f %f %f' % (bbox.left - offset, bbox.top - offset, bbox.width + 2 * offset, bbox.height + 2 * offset))
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root.set('width', "{:0.6f}{}".format(bbox.width + 2 * offset, self.svg.unit))
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root.set('height', "{:0.6f}{}".format(bbox.height + 2 * offset, self.svg.unit))
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if __name__ == '__main__':
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InputSTL().run() |