FabLab_Chemnitz/mightyscape-1.1-deprecated
FabLab_Chemnitz/mightyscape-1.1-deprecated
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mightyscape-1.1-deprecated/extensions/fablabchemnitz/input_stl/input_stl.py

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Initial commit
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#!/usr/bin/env python3
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'''
(C) 2018 Juergen Weigert <juergen@fabmail.org>, distribute under GPLv2 or ask
This is an input extension for inkscape to read STL files.
Requires: (python-lxml | python3-lxml), slic3r
For optional(!) rotation support:
Requires: (python-numpy-stl | python3-numpy-stl)
If you get ImportError: cannot import name 'mesh'
although an stl module is installed, then you have the wrong stl module.
Try 'pip3 uninstall stl; pip3 install numpy-stl'
2018-12-22 jw, v0.1 Initial draught
v0.1 First working standalone tool.
2018-12-26 jw, v0.3 Mesh rotation support via numpy-stl. Fully optional.
v0.4 Works fine as an inkscape input extension under Linux.
2019-03-01 jw, v0.5 numbers and center option added.
2019-07-17 jw, v0.6 fixed ry rotation.
2021-05-14 - Mario Voigt:
- changed extension to support ply,off,obj,stl by using OpenMesh
- moved extension to sub menu structure (allows preview)
- added different options
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#Notes
* requires exactly Slic3r-1.3.1-dev
-> https://dl.slic3r.org/dev/linux/
-> https://dl.slic3r.org/dev/win/
* 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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* use svg_pathstats(path_d): to compute bounding boxes.
* fix bbox calc: ValueError: b'/tmp/.mount_Slic3rQi5kIt/AppRun: line 65: 10415 Segmentation fault
(core dumped) LD_LIBRARY_PATH="$DIR/usr/lib:${LD_LIBRARY_PATH}" "${DIR}/usr/bin/perl-local" -I"${DIR}/usr/lib/local-lib/lib/perl5"
"${DIR}/usr/bin/slic3r.pl" --gui "$@"\n'
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'''
import sys
import os
import re
import subprocess
Initial commit
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from lxml import etree
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
import openmesh as om
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sys_platform = sys.platform.lower()
if sys_platform.startswith('win'):
slic3r = 'slic3r-console.exe'
elif sys_platform.startswith('darwin'):
slic3r = 'slic3r'
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):
slic3r = 'slic3r'
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class InputSTL(inkex.EffectExtension):
def add_arguments(self, pars):
pars.add_argument('--tab')
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#Options
pars.add_argument('--slic3r_cmd', default="slic3r", help="Command to invoke slic3r.")
pars.add_argument('--inputfile', help='Input file (OBJ/OFF/PLY/STL)')
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pars.add_argument('--scalefactor', type=float, default=1.0, help='Scale the model to custom size')
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('--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.')
pars.add_argument('--ry', type=float, default=None, help='Rotate STL object around Y-Axis before importing.')
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.')
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")
pars.add_argument("--extraborder", type=float, default=0.0)
pars.add_argument("--extraborder_units")
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#Style
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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("--fill_color", type=Color, default='1943148287', help="Fill color")
pars.add_argument("--min_fill_opacity", type=float, default=0.0, help="Min fill opacity")
pars.add_argument("--max_fill_opacity", type=float, default=1.0, help="Max fill opacity")
pars.add_argument("--diffuse_fill_opacity", default="regular", help="Diffuse fill opacity per layer")
pars.add_argument("--use_stroke_color", type=inkex.Boolean, default=True, help="Use stroke color")
pars.add_argument('--stroke_color', type=Color, default='879076607', help="Stroke color")
pars.add_argument("--min_stroke_width", type=float, default=1.0, help="Min stroke width")
pars.add_argument("--max_stroke_width", type=float, default=1.0, help="Max stroke width")
pars.add_argument("--diffuse_stroke_width", default="regular", help="Diffuse stroke width per layer")
pars.add_argument("--min_stroke_opacity", type=float, default=0.0, help="Min stroke opacity")
pars.add_argument("--max_stroke_opacity", type=float, default=1.0, help="Max stroke opacity")
pars.add_argument("--diffuse_stroke_opacity", default="regular", help="Diffuse stroke opacity per layer")
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def effect(self):
args = self.options
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#############################################
# test slic3r command
#############################################
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if sys_platform.startswith('win'):
# 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']
try:
proc = subprocess.Popen(cmd, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
except OSError as e:
hint="Maybe use --slic3r-cmd option?"
inkex.utils.debug("{0}\nCommand failed: errno={1} {2}\n\n{3}".format(' '.join(cmd), e.errno, e.strerror, hint), file=sys.stderr)
sys.exit(1)
stdout, stderr = proc.communicate()
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#############################################
# prepare STL input (also accept and convert obj, stl, ply, off)
#############################################
outputfilebase = os.path.splitext(os.path.basename(args.inputfile))[0]
converted_inputfile = os.path.join(tempfile.gettempdir(), outputfilebase + ".stl")
if not os.path.exists(args.inputfile):
inkex.utils.debug("The input file does not exist.")
exit(1)
input_mesh = om.read_trimesh(args.inputfile)
if input_mesh.n_faces() > args.max_num_faces:
inkex.utils.debug("Aborted. Target STL file has " + str(input_mesh.n_faces()) + " faces, but only " + str(args.max_num_faces) + " are allowed.")
exit(1)
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
if not os.path.exists(converted_inputfile):
inkex.utils.debug("The converted input file does not exist.")
exit(1)
args.inputfile = converted_inputfile #overwrite
#############################################
# create the layer slices
#############################################
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
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 ???
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)
## CAUTION: keep svg_pathstats() in sync with inkscape-centerlinetrace
def svg_pathstats(path_d):
""" calculate statistics from an svg path:
length (measuring bezier splines as straight lines through the handles).
points (all, including duplicates)
segments (number of not-connected!) path segments.
simple bounding box (ignoring curves of splines, but inclding handles.)
"""
xmin = 1e99
ymin = 1e99
xmax = -1e99
ymax = -1e99
p_points = 0
p_length = 0
p_segments = 0
path_d = path_d.lower()
for p in path_d.split('m'):
pp = re.sub('[cl,]', ' ', p)
pp,closed = re.subn('z\s*$','',pp)
xy = pp.split()
if len(xy) < 2:
# inkex.utils.debug(len(pp))
# inkex.utils.debug("short path error")
continue
x0 = float(xy[0])
y0 = float(xy[1])
if x0 > xmax: xmax = x0
if x0 < xmin: xmin = x0
if y0 > ymax: ymax = y0
if y0 < ymin: ymin = y0
p_points += 1
x = xy[2::2]
y = xy[3::2]
if len(x):
p_segments += 1
if closed:
x.extend(x0)
y.extend(y0)
for i in range(len(x)):
p_points += 1
dx = float(x[i]) - x0
dy = float(y[i]) - y0
p_length += math.sqrt( dx * dx + dy * dy )
x0,y0 = float(x[i]),float(y[i])
if x0 > xmax: xmax = x0
if x0 < xmin: xmin = x0
if y0 > ymax: ymax = y0
if y0 < ymin: ymin = y0
return { 'points':p_points, 'segments':p_segments, 'length':p_length, 'bbox': (xmin,ymin, xmax, ymax) }
def bbox_info(slic3r, file):
cmd = [ slic3r, '--no-gui', '--info', file ]
p = Popen(cmd, stdout=PIPE, stderr=PIPE)
out, err = p.communicate()
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if len(err) > 0:
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raise ValueError(err)
bb = {}
for l in out.decode().split("\n"):
m = re.match('((min|max)_[xyz])\s*=\s*(.*)', l)
if m: bb[m.group(1)] = float(m.group(3))
if (len(bb) != 6):
raise ValueError("slic3r --info did not return 6 elements for bbox")
return bb
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if args.center is True:
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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.
cx = (-bb['min_x'] + bb['max_x']) * 0.5 * 1/scale * magic * 25.4 / 75
cy = (-bb['min_y'] + bb['max_y']) * 0.5 * 1/scale * magic * 25.4 / 75
try:
proc = subprocess.Popen(cmd, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
except OSError as e:
raise OSError("{0}\nCommand failed: errno={1} {2}".format(' '.join(cmd), e.errno, e.strerror))
stdout, stderr = proc.communicate()
if not b'Done.' in stdout:
inkex.utils.debug("Command failed: {0}".format(' '.join(cmd)))
inkex.utils.debug("OUT: " + str(stdout))
inkex.utils.debug("ERR: " + str(stderr))
sys.exit(1)
# slic3r produces correct svg files, but with polygons instead of paths, and with undefined strokes.
# When opened with inkscape, most lines are invisible and polygons cannot be edited.
# To fix these issues, we postprocess the svg file:
# * replace polygon nodes with corresponding path nodes.
# * replace style attribute in polygon nodes with one that has a black stroke
stream = open(svgfile, 'r')
p = etree.XMLParser(huge_tree=True)
doc = etree.parse(stream, parser=p)
stream.close()
## To change the document units to mm, insert directly after the root node:
# e.tag = '{http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd}namedview'
# e.attrib['id'] = "base"
# e.attrib['{http://www.inkscape.org/namespaces/inkscape}document-units'] = "mm"
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totalPolygoncount = 0
for e in doc.iterfind('//{*}polygon'):
totalPolygoncount += 1
polygoncount = 0
if args.use_fill_color is False:
fill = "none"
else:
fill = args.fill_color
for e in doc.iterfind('//{*}polygon'):
polygoncount += 1
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# we ignore if min opacity values are larger than max opacity. We just use abs() for fill and stroke opacity
if args.diffuse_fill_opacity == "front_to_back":
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fill_opacity = 1 - (polygoncount / totalPolygoncount) * abs(args.max_fill_opacity - args.min_fill_opacity)
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elif args.diffuse_fill_opacity == "back_to_front":
fill_opacity = (polygoncount / totalPolygoncount) * abs(args.max_fill_opacity - args.min_fill_opacity)
elif args.diffuse_fill_opacity == "no_diffuse":
fill_opacity = args.max_fill_opacity
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else:
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inkex.utils.debug("Error: unkown diffuse fill opacity option")
exit(1)
if args.diffuse_stroke_width == "front_to_back":
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stroke_width = 1 - (polygoncount / totalPolygoncount) * abs(args.max_stroke_width - args.min_stroke_width)
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elif args.diffuse_stroke_width == "back_to_front":
stroke_width = (polygoncount / totalPolygoncount) * abs(args.max_stroke_width - args.min_stroke_width)
elif args.diffuse_stroke_width == "no_diffuse":
stroke_width = args.max_stroke_width
else:
inkex.utils.debug("Error: unkown diffuse fill opacity option")
exit(1)
if args.diffuse_stroke_opacity == "front_to_back":
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stroke_opacity = 1 - (polygoncount / totalPolygoncount) * abs(args.max_stroke_opacity - args.min_stroke_opacity)
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elif args.diffuse_stroke_opacity == "back_to_front":
stroke_opacity = (polygoncount / totalPolygoncount) * abs(args.max_stroke_opacity - args.min_stroke_opacity)
elif args.diffuse_stroke_opacity == "no_diffuse":
stroke_opacity = args.max_stroke_opacity
else:
inkex.utils.debug("Error: unkown diffuse fill opacity option")
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exit(1)
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if args.use_stroke_color is False:
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stroke = ""
else:
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stroke = "stroke:{}".format(args.stroke_color)
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# e.tag = '{http://www.w3.org/2000/svg}polygon'
# 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'}
e.tag = re.sub('polygon$', 'path', e.tag)
e.attrib['id'] = 'polygon%d' % polygoncount
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, fill_opacity, stroke, stroke_opacity, stroke_width)
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e.attrib['d'] = 'M ' + re.sub(' ', ' L ', scale_points(e.attrib['points'], 1/scale)) + ' Z'
del e.attrib['points']
if e.attrib.get('{http://slic3r.org/namespaces/slic3r}type') == 'contour':
# remove contour, but keep all slic3r:type='hole', whatever it is worth later.
del e.attrib['{http://slic3r.org/namespaces/slic3r}type']
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layercount = 0
for e in doc.iterfind('//{*}g'):
if e.attrib['{http://slic3r.org/namespaces/slic3r}z'] and e.attrib['id']:
e.attrib['{http://www.inkscape.org/namespaces/inkscape}label'] = e.attrib['id'] + ' slic3r:z=' + e.attrib['{http://slic3r.org/namespaces/slic3r}z']
del e.attrib['{http://slic3r.org/namespaces/slic3r}z']
# for some fun with our inkscape-paths2openscad extension, add sibling to e:
# <svg:desc id="descpoly60">Depth: 1mm\nOffset: 31mm</svg:desc>
desc = etree.Element('{http://www.w3.org/2000/svg}desc')
desc.attrib['id'] = 'descl'+str(layercount)
desc.text = "Depth: %.2fmm\nRaise: %.2fmm\n" % (1/scale, layercount/scale)
e.append(desc)
layercount+=1
if args.numbers is True:
num = etree.Element('{http://www.w3.org/2000/svg}text')
num.attrib['id'] = 'textnum'+str(layercount)
num.attrib['x'] = str(layercount*2)
num.attrib['y'] = str(layercount*4+10)
num.attrib['style'] = 'fill:#00FF00;fill-opacity:1;stroke:#00FF00;font-family:FreeSans;font-size:10pt;stroke-opacity:1;stroke-width:0.1'
num.text = "%d" % layercount
e.append(num)
if args.center is True:
cc = etree.Element('{http://www.w3.org/2000/svg}path')
cc.attrib['id'] = 'ccross'+str(layercount)
cc.attrib['style'] = 'fill:none;fill-opacity:1;stroke:#0000FF;font-family:FreeSans;font-size:10pt;stroke-opacity:1;stroke-width:0.1'
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)
e.append(cc)
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etree.cleanup_namespaces(doc.getroot(), top_nsmap={
'inkscape': 'http://www.inkscape.org/namespaces/inkscape',
'sodipodi': 'http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd'})
#inkex.utils.debug("{0}: {1} polygons in {2} layers converted to paths.".format(svgfile, polygoncount, layercount))
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if layercount == 0:
inkex.utils.debug("No layers imported. Try to lower your layer height")
exit(1)
#inkex.utils.debug(totalPolygoncount)
if totalPolygoncount == 0:
inkex.utils.debug("No polygons imported (empty groups). Try to lower your layer height")
exit(1)
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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
for element in doc.getroot().iter("{http://www.w3.org/2000/svg}g"):
stl_group.append(element)
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#apply scale factor
translation_matrix = [[args.scalefactor, 0.0, 0.0], [0.0, args.scalefactor, 0.0]]
stl_group.transform = Transform(translation_matrix) * stl_group.transform
#adjust canvas to the inserted unfolding
if args.resizetoimport:
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bbox = stl_group.bounding_box() #seems the bbox is not calculated if only one element is in the group. Thats a bug of Inkscape!
if bbox is not None:
namedView = self.document.getroot().find(inkex.addNS('namedview', 'sodipodi'))
root = self.svg.getElement('//svg:svg');
offset = self.svg.unittouu(str(args.extraborder) + args.extraborder_units)
root.set('viewBox', '%f %f %f %f' % (bbox.left - offset, bbox.top - offset, bbox.width + 2 * offset, bbox.height + 2 * offset))
root.set('width', "{:0.6f}{}".format(bbox.width + 2 * offset, self.svg.unit))
root.set('height', "{:0.6f}{}".format(bbox.height + 2 * offset, self.svg.unit))
else:
inkex.utils.debug("Error resizing to canvas.")
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if __name__ == '__main__':
InputSTL().run()
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