bl_info = { | |
"name": "FreeCAD Importer", | |
"category": "Import-Export", | |
"author": "Yorik van Havre", | |
"version": (5, 0, 0), | |
"blender": (2, 80, 0), | |
"location": "File > Import > FreeCAD", | |
"description": "Imports a .FCStd file from FreeCAD", | |
"warning": "This addon needs FreeCAD installed on your system. Only Part- and Mesh-based objects supported at the moment.", | |
} | |
# DESCRIPTION | |
# This script imports FreeCAD .FCStd files into Blender. This is a work in | |
# progress, so not all geometry elements of FreeCAD might be suported at | |
# this point. The development of this addon happens on the FreeCAD forum | |
# at https://forum.freecadweb.org (no thread yet, please | |
# create one ;) !) | |
# WARNING | |
# This addon requires FreeCAD to be installed on your system. | |
# A word of warning, your version of FreeCAD must be compiled | |
# with the same version of python as Blender. The first two | |
# numbers of the python version must be the same. For example, | |
# if Blender is using Pyhon 3.7.2, your version of FreeCAD must | |
# use Python 3.7 too (the third number after 3.7 | |
# | |
# Once you have a Python3 version of FreeCAD installed, the FreeCAD | |
# Python module must be known to Blender. There are several ways to obtain | |
# this: | |
# | |
# 1) Set the correct path to FreeCAD.so (or FreeCAD.pyd on windows) in | |
# the Addons preferences in user settings, there is a setting for | |
# that under the addon panel | |
# | |
# 2) Copy or symlink FreeCAD.so (or FreeCAD.pyd on windows) to one of the | |
# directories from the list you get when doing this in a Python console: | |
# | |
# import sys; print(sys.path) | |
# | |
# On Debian/Ubuntu and most Linux systems, an easy way to do this is is | |
# to symlink FreeCAD.so to your local (user) python modules folder: | |
# | |
# ln -s /path/to/FreeCAD.so /home/YOURUSERNAME/.local/lib/python3.6/site-packages | |
# | |
# (make sure to use the same python version your blender is using instead | |
# of 3.6) | |
# | |
# 3) A more brutal way if the others fail is to uncomment the following line | |
# and set the correct path to where your FreeCAD.so or FreeCAD.pyd resides: | |
# | |
# import sys; sys.path.append("/path/to/FreeCAD.so") | |
# | |
# A simple way to test if everything is OK is to enter the following line | |
# in the Python console of Blender. If no error message appears, | |
# everything is fine: | |
# | |
# import FreeCAD | |
# TODO | |
# support clones + hires | |
# support texts, dimensions, etc (non-part/mesh objects) | |
# HISTORY | |
# v1.0.0 - 12 june 2018 - initial release - basically working | |
# v2.0.0 - 21 june 2018 - option to turn cycles mat on/off, per-face material support, | |
# use of polygons when possible, shared materials | |
# v3.0.0 - 06 february 2019 - ported to Blender 2.80 | |
# v4.0.0 - 07 february 2019 - API changes + support of transparency | |
# v5.0.0 - 13 august 2019 - small fixes and better info messages if things go wrong | |
import sys, bpy, xml.sax, zipfile, os | |
from bpy_extras.node_shader_utils import PrincipledBSDFWrapper | |
TRIANGULATE = False # set to True to triangulate all faces (will loose multimaterial info) | |
class FreeCAD_xml_handler(xml.sax.ContentHandler): | |
"""A XML handler to process the FreeCAD GUI xml data""" | |
# this creates a dictionary where each key is a FC object name, | |
# and each value is a dictionary of property:value pairs | |
def __init__(self): | |
self.guidata = {} | |
self.current = None | |
self.properties = {} | |
self.currentprop = None | |
self.currentval = None | |
# Call when an element starts | |
def startElement(self, tag, attributes): | |
if tag == "ViewProvider": | |
self.current = attributes["name"] | |
elif tag == "Property": | |
name = attributes["name"] | |
if name in ["Visibility","ShapeColor","Transparency","DiffuseColor"]: | |
self.currentprop = name | |
elif tag == "Bool": | |
if attributes["value"] == "true": | |
self.currentval = True | |
else: | |
self.currentval = False | |
elif tag == "PropertyColor": | |
c = int(attributes["value"]) | |
r = float((c>>24)&0xFF)/255.0 | |
g = float((c>>16)&0xFF)/255.0 | |
b = float((c>>8)&0xFF)/255.0 | |
self.currentval = (r,g,b) | |
elif tag == "Integer": | |
self.currentval = int(attributes["value"]) | |
elif tag == "Float": | |
self.currentval = float(attributes["value"]) | |
elif tag == "ColorList": | |
self.currentval = attributes["file"] | |
# Call when an elements ends | |
def endElement(self, tag): | |
if tag == "ViewProvider": | |
if self.current and self.properties: | |
self.guidata[self.current] = self.properties | |
self.current = None | |
self.properties = {} | |
elif tag == "Property": | |
if self.currentprop and (self.currentval != None): | |
self.properties[self.currentprop] = self.currentval | |
self.currentprop = None | |
self.currentval = None | |
def import_fcstd(filename, | |
update=True, | |
placement=True, | |
tessellation=1.0, | |
skiphidden=True, | |
scale=1.0, | |
sharemats=True, | |
report=None): | |
"""Reads a FreeCAD .FCStd file and creates Blender objects""" | |
try: | |
# append the FreeCAD path specified in addon preferences | |
user_preferences = bpy.context.preferences | |
addon_prefs = user_preferences.addons[__name__].preferences | |
path = addon_prefs.filepath | |
if path: | |
if os.path.isfile(path): | |
path = os.path.dirname(path) | |
print("Configured FreeCAD path:",path) | |
sys.path.append(path) | |
else: | |
print("FreeCAD path is not configured in preferences") | |
import FreeCAD | |
except: | |
print("Unable to import the FreeCAD Python module. Make sure it is installed on your system") | |
print("and compiled with Python3 (same version as Blender).") | |
print("It must also be found by Python, you might need to set its path in this Addon preferences") | |
print("(User preferences->Addons->expand this addon).") | |
if report: | |
report({'ERROR'},"Unable to import the FreeCAD Python module. Check Addon preferences.") | |
return {'CANCELLED'} | |
# check if we have a GUI document | |
guidata = {} | |
zdoc = zipfile.ZipFile(filename) | |
if zdoc: | |
if "GuiDocument.xml" in zdoc.namelist(): | |
gf = zdoc.open("GuiDocument.xml") | |
guidata = gf.read() | |
gf.close() | |
Handler = FreeCAD_xml_handler() | |
xml.sax.parseString(guidata, Handler) | |
guidata = Handler.guidata | |
for key,properties in guidata.items(): | |
# open each diffusecolor files and retrieve values | |
# first 4 bytes are the array length, then each group of 4 bytes is abgr | |
if "DiffuseColor" in properties: | |
#print ("opening:",guidata[key]["DiffuseColor"]) | |
df = zdoc.open(guidata[key]["DiffuseColor"]) | |
buf = df.read() | |
#print (buf," length ",len(buf)) | |
df.close() | |
cols = [] | |
for i in range(1,int(len(buf)/4)): | |
cols.append((buf[i*4+3],buf[i*4+2],buf[i*4+1],buf[i*4])) | |
guidata[key]["DiffuseColor"] = cols | |
zdoc.close() | |
#print ("guidata:",guidata) | |
doc = FreeCAD.open(filename) | |
docname = doc.Name | |
if not doc: | |
print("Unable to open the given FreeCAD file") | |
if report: | |
report({'ERROR'},"Unable to open the given FreeCAD file") | |
return {'CANCELLED'} | |
#print ("Transferring",len(doc.Objects),"objects to Blender") | |
# import some FreeCAD modules needed below. After "import FreeCAD" these modules become available | |
import Part | |
def hascurves(shape): | |
for e in shape.Edges: | |
if not isinstance(e.Curve,(Part.Line,Part.LineSegment)): | |
return True | |
return False | |
matdatabase = {} # to store reusable materials | |
fcstd_collection = bpy.data.collections.new("FreeCAD import") | |
bpy.context.scene.collection.children.link(fcstd_collection) | |
for obj in doc.Objects: | |
#print("Importing",obj.Label) | |
if skiphidden: | |
if obj.Name in guidata: | |
if "Visibility" in guidata[obj.Name]: | |
if guidata[obj.Name]["Visibility"] == False: | |
#print(obj.Label,"is invisible. Skipping.") | |
continue | |
verts = [] | |
edges = [] | |
faces = [] | |
matindex = [] # face to material relationship | |
plac = None | |
faceedges = [] # a placeholder to store edges that belong to a face | |
name = "Unnamed" | |
if obj.isDerivedFrom("Part::Feature"): | |
# create mesh from shape | |
shape = obj.Shape | |
if placement: | |
placement = obj.Placement | |
shape = obj.Shape.copy() | |
shape.Placement = placement.inverse().multiply(shape.Placement) | |
if shape.Faces: | |
if TRIANGULATE: | |
# triangulate and make faces | |
rawdata = shape.tessellate(tessellation) | |
for v in rawdata[0]: | |
verts.append([v.x,v.y,v.z]) | |
for f in rawdata[1]: | |
faces.append(f) | |
for face in shape.Faces: | |
for e in face.Edges: | |
faceedges.append(e.hashCode()) | |
else: | |
# write FreeCAD faces as polygons when possible | |
for face in shape.Faces: | |
if (len(face.Wires) > 1) or (not isinstance(face.Surface,Part.Plane)) or hascurves(face): | |
# face has holes or is curved, so we need to triangulate it | |
rawdata = face.tessellate(tessellation) | |
for v in rawdata[0]: | |
vl = [v.x,v.y,v.z] | |
if not vl in verts: | |
verts.append(vl) | |
for f in rawdata[1]: | |
nf = [] | |
for vi in f: | |
nv = rawdata[0][vi] | |
nf.append(verts.index([nv.x,nv.y,nv.z])) | |
faces.append(nf) | |
matindex.append(len(rawdata[1])) | |
else: | |
f = [] | |
ov = face.OuterWire.OrderedVertexes | |
for v in ov: | |
vl = [v.X,v.Y,v.Z] | |
if not vl in verts: | |
verts.append(vl) | |
f.append(verts.index(vl)) | |
# FreeCAD doesn't care about verts order. Make sure our loop goes clockwise | |
c = face.CenterOfMass | |
v1 = ov[0].Point.sub(c) | |
v2 = ov[1].Point.sub(c) | |
n = face.normalAt(0,0) | |
if (v1.cross(v2)).getAngle(n) > 1.57: | |
f.reverse() # inverting verts order if the direction is couterclockwise | |
faces.append(f) | |
matindex.append(1) | |
for e in face.Edges: | |
faceedges.append(e.hashCode()) | |
for edge in shape.Edges: | |
# Treat remaining edges (that are not in faces) | |
if not (edge.hashCode() in faceedges): | |
if hascurves(edge): | |
dv = edge.discretize(9) #TODO use tessellation value | |
for i in range(len(dv)-1): | |
dv1 = [dv[i].x,dv[i].y,dv[i].z] | |
dv2 = [dv[i+1].x,dv[i+1].y,dv[i+1].z] | |
if not dv1 in verts: | |
verts.append(dv1) | |
if not dv2 in verts: | |
verts.append(dv2) | |
edges.append([verts.index(dv1),verts.index(dv2)]) | |
else: | |
e = [] | |
for vert in edge.Vertexes: | |
# TODO discretize non-linear edges | |
v = [vert.X,vert.Y,vert.Z] | |
if not v in verts: | |
verts.append(v) | |
e.append(verts.index(v)) | |
edges.append(e) | |
elif obj.isDerivedFrom("Mesh::Feature"): | |
# convert freecad mesh to blender mesh | |
mesh = obj.Mesh | |
if placement: | |
placement = obj.Placement | |
mesh = obj.Mesh.copy() # in meshes, this zeroes the placement | |
t = mesh.Topology | |
verts = [[v.x,v.y,v.z] for v in t[0]] | |
faces = t[1] | |
if verts and (faces or edges): | |
# create or update object with mesh and material data | |
bobj = None | |
bmat = None | |
if update: | |
# locate existing object (mesh with same name) | |
for o in bpy.data.objects: | |
if o.data.name == obj.Name: | |
bobj = o | |
print("Replacing existing object:",obj.Label) | |
bmesh = bpy.data.meshes.new(name=obj.Name) | |
bmesh.from_pydata(verts, edges, faces) | |
bmesh.update() | |
if bobj: | |
# update only the mesh of existing object. Don't touch materials | |
bobj.data = bmesh | |
else: | |
# create new object | |
bobj = bpy.data.objects.new(obj.Label, bmesh) | |
if placement: | |
#print ("placement:",placement) | |
bobj.location = placement.Base.multiply(scale) | |
m = bobj.rotation_mode | |
bobj.rotation_mode = 'QUATERNION' | |
if placement.Rotation.Angle: | |
# FreeCAD Quaternion is XYZW while Blender is WXYZ | |
q = (placement.Rotation.Q[3],)+placement.Rotation.Q[:3] | |
bobj.rotation_quaternion = (q) | |
bobj.rotation_mode = m | |
bobj.scale = (scale,scale,scale) | |
if obj.Name in guidata: | |
if matindex and ("DiffuseColor" in guidata[obj.Name]) and (len(matindex) == len(guidata[obj.Name]["DiffuseColor"])): | |
# we have per-face materials. Create new mats and attribute faces to them | |
fi = 0 | |
objmats = [] | |
for i in range(len(matindex)): | |
# DiffuseColor stores int values, Blender use floats | |
rgba = tuple([float(x)/255.0 for x in guidata[obj.Name]["DiffuseColor"][i]]) | |
# FreeCAD stores transparency, not alpha | |
alpha = 1.0 | |
if rgba[3] > 0: | |
alpha = 1.0-rgba[3] | |
rgba = rgba[:3]+(alpha,) | |
bmat = None | |
if sharemats: | |
if rgba in matdatabase: | |
bmat = matdatabase[rgba] | |
if not rgba in objmats: | |
objmats.append(rgba) | |
bobj.data.materials.append(bmat) | |
if not bmat: | |
if rgba in objmats: | |
bmat = bobj.data.materials[objmats.index(rgba)] | |
if not bmat: | |
bmat = bpy.data.materials.new(name=obj.Name+str(len(objmats))) | |
bmat.use_nodes = True | |
principled = PrincipledBSDFWrapper(bmat, is_readonly=False) | |
principled.base_color = rgba[:3] | |
if alpha < 1.0: | |
bmat.diffuse_color = rgba | |
principled.alpha = alpha | |
bmat.blend_method = "BLEND" | |
objmats.append(rgba) | |
bobj.data.materials.append(bmat) | |
if sharemats: | |
matdatabase[rgba] = bmat | |
for fj in range(matindex[i]): | |
bobj.data.polygons[fi+fj].material_index = objmats.index(rgba) | |
fi += matindex[i] | |
else: | |
# one material for the whole object | |
alpha = 1.0 | |
rgb = (0.5,0.5,0.5) | |
if "Transparency" in guidata[obj.Name]: | |
if guidata[obj.Name]["Transparency"] > 0: | |
alpha = (100-guidata[obj.Name]["Transparency"])/100.0 | |
if "ShapeColor" in guidata[obj.Name]: | |
rgb = guidata[obj.Name]["ShapeColor"] | |
rgba = rgb+(alpha,) | |
bmat = None | |
if sharemats: | |
if rgba in matdatabase: | |
bmat = matdatabase[rgba] | |
else: | |
#print("not found in db:",rgba,"in",matdatabase) | |
pass | |
if not bmat: | |
bmat = bpy.data.materials.new(name=obj.Name) | |
# no more internal engine! | |
# bmat.diffuse_color = rgb | |
# bmat.alpha = alpha | |
#if enablenodes: | |
bmat.use_nodes = True | |
principled = PrincipledBSDFWrapper(bmat, is_readonly=False) | |
principled.base_color = rgb | |
if alpha < 1.0: | |
bmat.diffuse_color = rgba | |
if sharemats: | |
matdatabase[rgba] = bmat | |
bobj.data.materials.append(bmat) | |
fcstd_collection.objects.link(bobj) | |
#bpy.context.scene.objects.active = obj | |
#obj.select = True | |
FreeCAD.closeDocument(docname) | |
# why is this here? I don't remember. It doesn't seem to work anymore anyway... | |
#for area in bpy.context.screen.areas: | |
# if area.type == 'VIEW_3D': | |
# for region in area.regions: | |
# if region.type == 'WINDOW': | |
# override = {'area': area, 'region': region, 'edit_object': bpy.context.edit_object} | |
# bpy.ops.view3d.view_all(override) | |
print("Import finished without errors") | |
return {'FINISHED'} | |
#============================================================================== | |
# Blender Operator class | |
#============================================================================== | |
class IMPORT_OT_FreeCAD(bpy.types.Operator): | |
"""Imports the contents of a FreeCAD .FCStd file""" | |
bl_idname = 'import_fcstd.import_freecad' | |
bl_label = 'Import FreeCAD FCStd file' | |
bl_options = {'REGISTER', 'UNDO'} | |
# ImportHelper mixin class uses this | |
filename_ext = ".fcstd" | |
# Properties assigned by the file selection window. | |
directory : bpy.props.StringProperty(maxlen=1024, subtype='FILE_PATH', options={'HIDDEN', 'SKIP_SAVE'}) | |
files : bpy.props.CollectionProperty(type=bpy.types.OperatorFileListElement, options={'HIDDEN', 'SKIP_SAVE'}) | |
option_skiphidden : bpy.props.BoolProperty(name="Skip hidden objects", default=True, | |
description="Only import objects that where visible in FreeCAD" | |
) | |
option_update : bpy.props.BoolProperty(name="Update existing objects", default=True, | |
description="Keep objects with same names in current scene and their materials, only replace the geometry" | |
) | |
option_placement : bpy.props.BoolProperty(name="Use Placements", default=True, | |
description="Set Blender pivot points to the FreeCAD placements" | |
) | |
option_tessellation : bpy.props.FloatProperty(name="Tessellation value", default=1.0, | |
description="The tessellation value to apply when triangulating shapes" | |
) | |
option_scale : bpy.props.FloatProperty(name="Scaling value", default=0.001, | |
description="A scaling value to apply to imported objects. Default value of 0.001 means one Blender unit = 1 meter" | |
) | |
option_sharemats : bpy.props.BoolProperty(name="Share similar materials", default=True, | |
description="Objects with same color/transparency will use the same material" | |
) | |
# invoke is called when the user picks our Import menu entry. | |
def invoke(self, context, event): | |
context.window_manager.fileselect_add(self) | |
return {'RUNNING_MODAL'} | |
# execute is called when the user is done using the modal file-select window. | |
def execute(self, context): | |
dir = self.directory | |
for file in self.files: | |
filestr = str(file.name) | |
if filestr.lower().endswith(".fcstd"): | |
return import_fcstd(filename=dir+filestr, | |
update=self.option_update, | |
placement=self.option_placement, | |
tessellation=self.option_tessellation, | |
skiphidden=self.option_skiphidden, | |
scale=self.option_scale, | |
sharemats=self.option_sharemats, | |
report=self.report) | |
return {'FINISHED'} | |
class IMPORT_OT_FreeCAD_Preferences(bpy.types.AddonPreferences): | |
"""A preferences settings dialog to set the path to the FreeCAD module""" | |
bl_idname = __name__ | |
filepath : bpy.props.StringProperty( | |
name="Path to FreeCAD.so (Mac/Linux) or FreeCAD.pyd (Windows)", | |
subtype='FILE_PATH', | |
) | |
def draw(self, context): | |
layout = self.layout | |
layout.label(text="FreeCAD must be installed on your system, and its path set below. Make sure both FreeCAD and Blender use the same Python version (check their Python console)") | |
layout.prop(self, "filepath") | |
#============================================================================== | |
# Register plugin with Blender | |
#============================================================================== | |
classes = ( | |
IMPORT_OT_FreeCAD, | |
IMPORT_OT_FreeCAD_Preferences, | |
) | |
# needed if you want to add into a dynamic menu | |
def menu_func_import(self, context): | |
self.layout.operator(IMPORT_OT_FreeCAD.bl_idname, text="FreeCAD (.FCStd)") | |
def register(): | |
from bpy.utils import register_class | |
for cls in classes: | |
register_class(cls) | |
bpy.types.TOPBAR_MT_file_import.append(menu_func_import) | |
def unregister(): | |
from bpy.utils import unregister_class | |
for cls in reversed(classes): | |
unregister_class(cls) | |
bpy.types.TOPBAR_MT_file_import.remove(menu_func_import) | |
if __name__ == "__main__": | |
register() |
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That's what you get of editing at the last minute without testing |
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Wonderful idea! But it's a pity that there is such an incompatibility between Python 3.6 and 3.7 . I wonder if is not possible to load directly the file without using the FreeCAD libraries, this would make the import easier. At the end, the xml files inside the .fcstd should contain all the information. Am I wrong? |
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Apologies for commenting here but I wasn't sure if FreeCAD forum or Blender was best, but decided to go straight to the author. Im am running MacOS 10.15, with Blender 2.8 and FreeCAD 0.19 ( For Python comparability). I have installed the Add-on via the Blender "Preferences -> Add-on -> Install from File". I have added the FreeCAD.so path and restarted Blender. When I import a .fcstd file; the screenshot below appears. I have tried running "import FreeCAD" in the Blender python console, no error is shown. Thank you in advance. |
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It's not that simple unfortunately... All the geometry information is stored in the Brep files. Reconstructing everything from the xml file is not always possible, and in any case it would be almost like reprogramming a new FreeCAD engine from scratch as it would need to recalculate all the geometry without using its current OCC engine |
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Hi. I am trying to make this add-on to work but I don't understand how to install-it properly. I am using MacOS 10.14 with the latest FreeCAD v0.19 version from Github and Blender 2.82 stable release. When I try to activate the add-on, I have this error message: How can I define the path to the FreeCAD app, so that the addon can find my FreeCAD install? P.S. Seems that FreeCAD it is using Python 3.8.2 and Blender 3.7.2. How can I make Blender to load the 3.8.2 version of Python? |
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Inside Blender:
This will show you all the folders where Python looks for modules. the FreeCAD.so file must be in one of them.
You cannot do that on the fly. The python version is built-in, hard-coded when FreeCAD and Blender are compiled (this is because they are both C++ applications that embed the C++ code of Python). So your only solution is to replace either your version of Blender or FreeCAD with one that has matching Python version... |
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Hi Yorik. Thank you for your answer. On MacOS, I do found the FreeCAD.so located here: "/Applications/FreeCAD.app/Contents/Resources/lib/FreeCAD.so" After creating the symplink using the command: It is on internet an archive with different FreeCAD builds? I can't find a FreeCAD MacOS build with Python 3.7. |
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I found this package: "osx-64/freecad-0.19.pre-py37hdbba661_85.tar.bz2" from: https://anaconda.org/freecad/freecad/files?page=2 but after unarchiving I get this error when activating the "FreeCAD Importer Addon" on Blender:
|
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It is hard for me to say what's wrong because I'm not familiar with MacOS, but by the look of it, either FreeCAD was not correctly installed (FreeCAD.so file is corrupt somehow), or there is a python version mismatch. Make sure your Blender Python version is 3.7.X (the third number doesn't matter)? You find that info in the Python console of Blender |
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Like said above, there is no way to do that. Python is compiled inside the application (in both FreeCAD and Blender), you cannot change it on the fly. The only way to change the python version is to recompile one of the two with another version of Python. If FreeCAD is using Python 3.8.2 and Blender 3.7.2, you must either find a version of FreeCAD that uses Python 3.7.XXX or a version of Blender that uses Python 3.8.XXX (the third number doesn't matter). I believe the latter option will be easier, as Python 3.8 is more or less the default nowadays |
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What is strange in my case - on windows - I have no FreeCAD.pyd on 0.18 (installer) and 0.19 (Git repo zip) versions of FreeCAD.
Blender: (PYTHON INTERACTIVE CONSOLE 3.7.7 (default, Jun 13 2020, 11:11:23)) |
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It should be in D:\FreeCAD\FreeCAD_0.19\lib I think |
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Please check the Python version of both FreeCAD and Blender, as explained above |
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Hi Yorik, All versions of Blender 2.79 to 2.91 use either Python 3.5 or Python 3.7 Could you tell me which versions you used for your script? Thanks a lot, looking forward to using your script! |
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Hi Vincent, |
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Thanks for your quick answer. |
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Hi.
Line 167 and 169 are missing a closing parenthesis ')'