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export_to_FastHenry.py
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export_to_FastHenry.py
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#***************************************************************************
#* *
#* Copyright (c) 2018 *
#* Efficient Power Conversion Corporation, Inc. http://epc-co.com *
#* *
#* Developed by FastFieldSolvers S.R.L. under contract by EPC *
#* http://www.fastfieldsolvers.com *
#* *
#* This program is free software; you can redistribute it and/or modify *
#* it under the terms of the GNU Lesser General Public License (LGPL) *
#* as published by the Free Software Foundation; either version 2 of *
#* the License, or (at your option) any later version. *
#* for detail see the LICENCE text file. *
#* *
#* This program is distributed in the hope that it will be useful, *
#* but WITHOUT ANY WARRANTY; without even the implied warranty of *
#* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
#* GNU Library General Public License for more details. *
#* *
#* You should have received a copy of the GNU Library General Public *
#* License along with this program; if not, write to the Free Software *
#* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
#* USA *
#* *
#***************************************************************************
import FreeCAD, Mesh, Part, MeshPart, DraftGeomUtils, os
from FreeCAD import Vector
import numpy as np
if FreeCAD.GuiUp:
import FreeCADGui
from PySide import QtCore, QtGui
else:
def translate(ctxt,txt):
return txt
__title__="FreeCAD E.M. FastHenry2 Macros"
__author__ = "FastFieldSolvers S.R.L."
__url__ = "http://www.fastfieldsolvers.com"
DEF_FOLDER = "."
def export_segs(filename="", disc=3, custDot="", FHbug=False, w=0, h=0, nhinc=0, nwinc=0, folder=DEF_FOLDER):
'''Export segments in FastHenry format
The function operates on the selection. The selection must be a sketch, a wire or an edge.
'filename' is the name of the export file
'disc' is the maximum number of segments into which curves will be discretized
'custDot' is a custom directive added in the output file (a string added as it is on top of the file)
'FHbug' works around a FastHenry bug happening for some very exact values of diagonal parallel segments,
giving rise to 'uh oh segments don't seem parallel' kind of errors
'w', 'h', 'nhinc', 'nwinc' are the FastHenry parameters;
if zero, they are ignored (FastHenry will use the .default values).
If 'w' is not zero, no segment shorter than abs(w)*3 will be output. Note that the end point of
the previous segment will be the starting point of the *next* segment (skipping the short one).
This might cause misalignments if there are many consecutive short segments.
If 'w' is negative, it assures that no curve will be discretized if the radius is less than w*3,
to avoid short thick (overlapping) segments.
'folder' is the folder in which 'filename' will be saved
Example:
export_segs("mysegs.inp", folder="C:/temp")
'''
# get selection
sel = FreeCADGui.Selection.getSelection()
# if no valid selection was passed
if sel == None:
return
if filename == "":
filename = sel[0].Label.replace(" ","_") + ".txt"
if not os.path.isdir(folder):
os.mkdir(folder)
with open(folder + os.sep + filename, 'w') as fid:
fid.write("* Conductor definition file for the following objects\n")
for obj in sel:
fid.write("* - " + obj.Label + "\n")
fid.write("* created using FreeCAD's ElectroMagnetic Workbench\n")
fid.write("* see http://www.freecad.org and http://www.fastfieldsolvers.com\n")
fid.write("\n")
# scan objects in selection and export to FastHenry one by one
for obj in sel:
edges_raw = []
# checking TypeId; cannot check type(obj), too generic
if obj.TypeId == "Sketcher::SketchObject":
if obj.Shape.ShapeType == "Wire":
edges_raw.extend(obj.Shape.Edges)
# compound
elif obj.TypeId == "Part::Compound":
edges_raw.extend(obj.Shape.Edges)
# line or DWire (Draft Wire)
elif obj.TypeId == "Part::Part2DObjectPython":
if obj.Shape.ShapeType == "Wire":
edges_raw.extend(obj.Shape.Edges)
# wire created by upgrading a set of (connected) edges
elif obj.TypeId == "Part::Feature":
if obj.Shape.ShapeType == "Wire":
edges_raw.extend(obj.Shape.Edges)
# any other part, provided it has a 'Shape' attribute
else:
if hasattr(obj, "Shape"):
if obj.Shape.ShapeType == "Wire":
edges_raw.extend(obj.Shape.Edges)
else:
# to be implemented?
FreeCAD.Console.PrintMessage("Unsupported object type for '" + obj.Label + "', skipping\n")
continue
# sort the edges. If the selected path is disconnected, the path will be broken!
edges = Part.__sortEdges__(edges_raw)
# TBC: join parts with additional edges, or .equiv-ing them, using distToShape between the obj.Shape
# Can happen with a compound containing different edges / wires / stetches
#edge = Part.Edge(Part.Line(Vector(154.0002, -62.6872,0), Vector(154.0002,-53.1876,0)))
#v = Part.Vertex(edges[0].Curve.StartPoint)
#v.Tolerance
#App.ActiveDocument.Shape.Shape.Vertexes[1].distToShape(App.ActiveDocument.Shape001.Shape.Vertexes[0])
# scan edges and derive nodes
nodes = []
for edge in edges:
if type(edge.Curve) == Part.Circle:
# discretize
if edge.Curve.Radius < -w*3 and w < 0:
ddisc = 1
else:
ddisc = disc
for i in range(0, ddisc):
step = (edge.LastParameter - edge.FirstParameter) / ddisc
# always skip last vertex, as the next edge will start where this finishes
nodes.append(edge.valueAt(edge.FirstParameter + i*step))
# quick & dirty trick
lastvertex = edge.valueAt(edge.LastParameter)
elif type(edge.Curve) == Part.Ellipse:
# discretize
if (edge.Curve.MajorRadius < -w*3 or edge.Curve.MinorRadius < -w*3) and w < 0:
ddisc = 1
else:
ddisc = disc
for i in range(0, ddisc):
step = (edge.LastParameter - edge.FirstParameter) / ddisc
# always skip last vertex, as the next edge will start where this finishes
nodes.append(edge.valueAt(edge.FirstParameter + i*step))
# quick & dirty trick
lastvertex = edge.valueAt(edge.LastParameter)
elif type(edge.Curve) == Part.Line:
# if w=0, the following condition is always true
if edge.Length > abs(w)*3:
nodes.append(edge.valueAt(edge.FirstParameter))
# quick & dirty trick
lastvertex = edge.valueAt(edge.LastParameter)
else:
FreeCAD.Console.PrintMessage("Unknown edge: " + str(type(edge.Curve)) + " in '" + obj.Label + "',, skipping\n")
# now add the very last vertex
nodes.append(lastvertex)
if len(nodes) < 2:
FreeCAD.Console.PrintMessage("Less than two nodes found in '" + obj.Label + "', skipping\n")
continue
# start actual object output in FastHenry format
fid.write("* " + obj.Label + "\n")
if custDot != "":
fid.write(custDot + "\n")
baseName = obj.Label.replace(" ","_") + "_"
# now create nodes
for i, node in enumerate(nodes):
# extension in the node name must be "S" for the Start node
# and "E" for the End node
if i == 0:
ext = "S"
elif i == len(nodes)-1:
ext = "E"
else:
ext = str(i)
if FHbug == True:
fid.write("N" + baseName + ext + " x=" + str(node.x) + " y=" + str(int(node.y)) + " z=" + str(node.z) + "\n")
else:
fid.write("N" + baseName + ext + " x=" + str(node.x) + " y=" + str(node.y) + " z=" + str(node.z) + "\n")
# and finally segments
for i in range(0, len(nodes)-1):
# extension in the node name must be "S" for the Start node
# and "E" for the End node
#
# start node
if i == 0:
ext1 = "S"
else:
ext1 = str(i)
# end node
if i >= len(nodes)-2:
ext2 = "E"
else:
ext2 = str(i+1)
fid.write("E" + baseName + "N" + ext1 + "N" + ext2 + " ")
fid.write("N" + baseName + ext1 + " " + "N" + baseName + ext2)
if w > 0:
fid.write(" w=" + str(w))
if h > 0:
fid.write(" h=" + str(w))
if nhinc > 0:
fid.write(" nhinc=" + str(w))
if nwinc > 0:
fid.write(" nwinc=" + str(w))
fid.write("\n")
# blank lines before next object
fid.write("\n\n")
fid.closed
def export_segs2(filename="", disc=3, custDot="", FHbug=False, breakSeg=False, w=0, h=0, nhinc=0, nwinc=0, folder=DEF_FOLDER):
'''Export segments in FastHenry format
The function operates on the selection. The selection must be a sketch, a wire or an edge.
Version 2 means it discretizes both curved and straight parts of a path. It also dumps nodes of an underlying GND plane.
'filename' is the name of the export file
'disc' is the maximum number of segments into which curves will be discretized
'custDot' is a custom directive added in the output file (a string added as it is on top of the file)
'FHbug' works around a FastHenry bug happening for some very exact values of diagonal parallel segments,
giving rise to 'uh oh segments don't seem parallel' kind of errors
'breakSeg' if true breaks also straight segments into 'disc' parts
'w', 'h', 'nhinc', 'nwinc' are the FastHenry parameters;
if zero, they are ignored (FastHenry will use the .default values).
If 'w' is not zero, no segment shorter than abs(w)*3 will be output. Note that the end point of
the previous segment will be the starting point of the *next* segment (skipping the short one).
This might cause misalignments if there are many consecutive short segments.
If 'w' is negative, it assures that no curve will be discretized if the radius is less than w*3,
to avoid short thick (overlapping) segments.
'folder' is the folder in which 'filename' will be saved
Example:
export_segs2("mysegs.inp", folder="C:/temp")
'''
# get selection
sel = FreeCADGui.Selection.getSelection()
# if no valid selection was passed
if sel == None:
return
if filename == "":
filename = sel[0].Label.replace(" ","_") + ".txt"
if not os.path.isdir(folder):
os.mkdir(folder)
with open(folder + os.sep + filename, 'w') as fid:
fid.write("* Conductor definition file for the following objects\n")
for obj in sel:
fid.write("* - " + obj.Label + "\n")
fid.write("* created using FreeCAD's ElectroMagnetic Workbench\n")
fid.write("* see http://www.freecad.org and http://www.fastfieldsolvers.com\n")
fid.write("\n")
# scan objects in selection and export to FastHenry one by one
gndplane_nodes = []
for obj in sel:
edges_raw = []
# checking TypeId; cannot check type(obj), too generic
if obj.TypeId == "Sketcher::SketchObject":
if obj.Shape.ShapeType == "Wire":
edges_raw.extend(obj.Shape.Edges)
# compound
elif obj.TypeId == "Part::Compound":
edges_raw.extend(obj.Shape.Edges)
# line or DWire (Draft Wire)
elif obj.TypeId == "Part::Part2DObjectPython":
if obj.Shape.ShapeType == "Wire":
edges_raw.extend(obj.Shape.Edges)
# wire created by upgrading a set of (connected) edges
elif obj.TypeId == "Part::Feature":
if obj.Shape.ShapeType == "Wire":
edges_raw.extend(obj.Shape.Edges)
# any other part, provided it has a 'Shape' attribute
else:
if hasattr(obj, "Shape"):
if obj.Shape.ShapeType == "Wire":
edges_raw.extend(obj.Shape.Edges)
else:
# to be implemented?
FreeCAD.Console.PrintMessage("Unsupported object type for '" + obj.Label + "', skipping\n")
continue
# sort the edges. If the selected path is disconnected, the path will be broken!
edges = Part.__sortEdges__(edges_raw)
# scan edges and derive nodes
nodes = []
for edge in edges:
if type(edge.Curve) == Part.Circle:
# discretize
if edge.Curve.Radius < -w*3 and w < 0:
ddisc = 1
else:
ddisc = disc
for i in range(0, ddisc):
step = (edge.LastParameter - edge.FirstParameter) / ddisc
# always skip last vertex, as the next edge will start where this finishes
nodes.append(edge.valueAt(edge.FirstParameter + i*step))
# quick & dirty trick
lastvertex = edge.valueAt(edge.LastParameter)
elif type(edge.Curve) == Part.Ellipse:
# discretize
if (edge.Curve.MajorRadius < -w*3 or edge.Curve.MinorRadius < -w*3) and w < 0:
ddisc = 1
else:
ddisc = disc
for i in range(0, ddisc):
step = (edge.LastParameter - edge.FirstParameter) / ddisc
# always skip last vertex, as the next edge will start where this finishes
nodes.append(edge.valueAt(edge.FirstParameter + i*step))
# quick & dirty trick
lastvertex = edge.valueAt(edge.LastParameter)
elif type(edge.Curve) == Part.Line:
# if w=0, the following condition is always true
if edge.Length > abs(w)*3:
if breakSeg == False:
ddisc = 1
else:
ddisc = disc
for i in range(0, ddisc):
step = (edge.LastParameter - edge.FirstParameter) / ddisc
# always skip last vertex, as the next edge will start where this finishes
nodes.append(edge.valueAt(edge.FirstParameter + i*step))
# quick & dirty trick
lastvertex = edge.valueAt(edge.LastParameter)
else:
FreeCAD.Console.PrintMessage("Unknown edge: " + str(type(edge.Curve)) + " in '" + obj.Label + "',, skipping\n")
# now add the very last vertex
nodes.append(lastvertex)
if len(nodes) < 2:
FreeCAD.Console.PrintMessage("Less than two nodes found in '" + obj.Label + "', skipping\n")
continue
# start actual object output in FastHenry format
fid.write("* " + obj.Label + "\n")
if custDot != "":
fid.write(custDot + "\n")
baseName = obj.Label.replace(" ","_") + "_"
# now create nodes
for i, node in enumerate(nodes):
# extension in the node name must be "S" for the Start node
# and "E" for the End node
if i == 0:
ext = "S"
elif i == len(nodes)-1:
ext = "E"
else:
ext = str(i)
if FHbug == True:
fid.write("N" + baseName + ext + " x=" + str(node.x) + " y=" + str(int(node.y)) + " z=" + str(node.z) + "\n")
gndplane_nodes.append( (baseName+ext, str(node.x), str(int(node.y)), str(node.z)) )
else:
fid.write("N" + baseName + ext + " x=" + str(node.x) + " y=" + str(node.y) + " z=" + str(node.z) + "\n")
gndplane_nodes.append( (baseName+ext, str(node.x), str(int(node.y)), str(node.z)) )
# and finally segments
for i in range(0, len(nodes)-1):
# extension in the node name must be "S" for the Start node
# and "E" for the End node
#
# start node
if i == 0:
ext1 = "S"
else:
ext1 = str(i)
# end node
if i >= len(nodes)-2:
ext2 = "E"
else:
ext2 = str(i+1)
fid.write("E" + baseName + "N" + ext1 + "N" + ext2 + " ")
fid.write("N" + baseName + ext1 + " " + "N" + baseName + ext2)
if w > 0:
fid.write(" w=" + str(w))
if h > 0:
fid.write(" h=" + str(w))
if nhinc > 0:
fid.write(" nhinc=" + str(w))
if nwinc > 0:
fid.write(" nwinc=" + str(w))
fid.write("\n")
# blank lines before next object
fid.write("\n\n")
# create GND plane nodes
for gndplane_node in gndplane_nodes:
fid.write("+ Nplane" + gndplane_node[0] + " (" + gndplane_node[1] + "," +
gndplane_node[2] + "," + "-1.5" + ")\n" )
# blank lines before next object
fid.write("\n\n")
# create .equiv plane nodes statements
for gndplane_node in gndplane_nodes:
fid.write(".equiv Nplane" + gndplane_node[0] + " N" + gndplane_node[0] + "\n")
fid.closed
def create_FH_plane(filename="", seg1=10, seg2=10, wx=10, wy=10, name="", custDot="", thick=1.0, folder=DEF_FOLDER):
'''Create a conductive plane using primitive FastHenry segments
'filename' is the name of the export file
'seg1' is the number of segments along x
'seg2' is the number of segments along y
'wx', 'wy' are the plane dimensions along x and y
'name' is the node extension name (e.g. Nname_1_2)
'folder' is the folder in which 'filename' will be saved
Example:
create_FH_plane("plane.inp", seg1=5, seg2=3, folder="C:/temp")
'''
if filename == "":
filename = sel[0].Label.replace(" ","_") + ".txt"
if not os.path.isdir(folder):
os.mkdir(folder)
with open(folder + os.sep + filename, 'w') as fid:
fid.write("* Conductive plane built using primitive FastHenry segments\n")
fid.write("* created using FreeCAD's ElectroMagnetic Workbench\n")
fid.write("* see http://www.freecad.org and http://www.fastfieldsolvers.com\n")
fid.write("\n")
stepx = wx / seg1
stepy = wy / seg2
# lay down nodes
for i in range(0, seg1+1):
for j in range(0, seg2+1):
fid.write("N" + name + "_" + str(i) + "_" + str(j) + " x=" + str(i*stepx) + " y=" + str(j*stepy) + " z=0 \n")
# lay down segments
#
# along y
for i in range(0, seg1+1):
for j in range(0, seg2):
fid.write("E2"+ name + "_" + str(i) + "_" + str(j) + " N" + name + "_" + str(i) + "_" + str(j) + " N" + name + "_" + str(i) + "_" + str(j+1) + " w=" + str(stepx) + " h=" + str(thick) + " \n")
# along x
for j in range(0, seg2+1):
for i in range(0, seg1):
fid.write("E2"+ name + "_" + str(i) + "_" + str(j) + " N" + name + "_" + str(i) + "_" + str(j) + " N" + name + "_" + str(i+1) + "_" + str(j) + " w=" + str(stepy) + " h=" + str(thick) + " \n")
fid.write("\n")
fid.closed
def meshSolidWithSegments(obj=None,delta=1.0,deltaX=0.0,deltaY=0.0,deltaZ=0.0,stayInside=False,generateSegs=True):
''' Mesh a solid object with a grid of segments
'''
if obj == None:
return
if not hasattr(obj,"Shape"):
return
from FreeCAD import Vector
import EM_FHNode
import EM_FHSegment
import numpy as np
# if the user specified no deltaX
if deltaX <= 0.0:
deltaX = float(delta)
# if the user specified no deltaY
if deltaY <= 0.0:
deltaY = float(delta)
# if the user specified no deltaZ
if deltaZ <= 0.0:
deltaZ = float(delta)
bbox = obj.Shape.BoundBox
stepsX = int(bbox.XLength/deltaX)
deltaSideX = (bbox.XLength - deltaX * stepsX) / 2.0
stepsY = int(bbox.YLength/deltaY)
deltaSideY = (bbox.YLength - deltaY * stepsY) / 2.0
stepsZ = int(bbox.ZLength/deltaZ)
deltaSideZ = (bbox.ZLength - deltaZ * stepsZ) / 2.0
# create the 3D array of nodes
isNode=np.full((stepsX+1,stepsY+1,stepsZ+1), False, bool)
# and now iterate to find which node is inside the object 'obj'
pos_x = bbox.XMin + deltaSideX
for step_x in range(0,stepsX+1):
pos_y = bbox.YMin + deltaSideY
for step_y in range(0,stepsY+1):
pos_z = bbox.ZMin + deltaSideZ
for step_z in range(0,stepsZ+1):
# if the point is inside the object shape, or on the surface, flag it
if obj.Shape.isInside(Vector(pos_x,pos_y,pos_z),0.0,True):
isNode[step_x,step_y,step_z] = True
pos_z = pos_z + deltaZ
pos_y = pos_y + deltaY
pos_x = pos_x + deltaX
# if we don't need to stay within the object shape boundaries,
# the segment will overlap the shape contour (just like the uniform conductive planes)
nodes=np.full((stepsX+1,stepsY+1,stepsZ+1), None, np.object)
if stayInside == False:
pos_x = bbox.XMin + deltaSideX
for step_x in range(0,stepsX+1):
pos_y = bbox.YMin + deltaSideY
for step_y in range(0,stepsY+1):
pos_z = bbox.ZMin + deltaSideZ
for step_z in range(0,stepsZ+1):
# if the point is inside the object shape, or on the surface, flag it
if isNode[step_x,step_y,step_z] == True:
# create the node
node = EM_FHNode.makeFHNode(X=pos_x, Y=pos_y, Z=pos_z)
# store it in the array
nodes[step_x,step_y,step_z] = node
pos_z = pos_z + deltaZ
pos_y = pos_y + deltaY
pos_x = pos_x + deltaX
# if we must stay within the object shape boundaries (within the accuracy
# of the point sampling)
else:
pos_x = bbox.XMin + deltaSideX
for step_x in range(0,stepsX):
pos_y = bbox.YMin + deltaSideY
for step_y in range(0,stepsY):
pos_z = bbox.ZMin + deltaSideZ
for step_z in range(0,stepsZ):
# if all the eight cube corners are inside the object shape,
# we consider the center point well inside the object shape, i.e. also
# for a segment lying on a plane parallel to the plane xy,
# with width=deltaX, height=deltaY we are within the object
if (isNode[step_x,step_y,step_z] == True and isNode[step_x+1,step_y,step_z] == True and
isNode[step_x,step_y+1,step_z] == True and isNode[step_x+1,step_y+1,step_z] == True and
isNode[step_x,step_y,step_z+1] == True and isNode[step_x+1,step_y,step_z+1] == True and
isNode[step_x,step_y+1,step_z+1] == True and isNode[step_x+1,step_y+1,step_z+1] == True):
# create the node
node = EM_FHNode.makeFHNode(X=pos_x+deltaX/2.0, Y=pos_y+deltaY/2.0, Z=pos_z+deltaZ/2.0)
# store it in the array
nodes[step_x,step_y,step_z] = node
pos_z = pos_z + deltaZ
pos_y = pos_y + deltaY
pos_x = pos_x + deltaX
# now create the grid of segments
# first along x
for step_z in range(0,stepsZ+1):
for step_y in range(0,stepsY+1):
for step_x in range(0,stepsX):
# if the node and the next are inside the object shape, create the segment
if nodes[step_x,step_y,step_z] != None and nodes[step_x+1,step_y,step_z] != None:
segment = EM_FHSegment.makeFHSegment(nodeStart=nodes[step_x,step_y,step_z],nodeEnd=nodes[step_x+1,step_y,step_z],width=deltaX,height=deltaZ)
# then along y
for step_z in range(0,stepsZ+1):
for step_x in range(0,stepsX+1):
for step_y in range(0,stepsY):
# if the node and the next are inside the object shape, create the segment
if nodes[step_x,step_y,step_z] != None and nodes[step_x,step_y+1,step_z] != None:
segment = EM_FHSegment.makeFHSegment(nodeStart=nodes[step_x,step_y,step_z],nodeEnd=nodes[step_x,step_y+1,step_z],width=deltaY,height=deltaZ)
# finally along z
for step_x in range(0,stepsX+1):
for step_y in range(0,stepsY+1):
for step_z in range(0,stepsZ):
# if the node and the next are inside the object shape, create the segment
if nodes[step_x,step_y,step_z] != None and nodes[step_x,step_y,step_z+1] != None:
segment = EM_FHSegment.makeFHSegment(nodeStart=nodes[step_x,step_y,step_z],nodeEnd=nodes[step_x,step_y,step_z+1],width=deltaX,height=deltaY)
def meshSolidWithVoxels(obj=None,delta=1.0):
''' Voxelize a solid object
'''
if obj == None:
return
if not hasattr(obj,"Shape"):
return
from FreeCAD import Vector
import numpy as np
bbox = obj.Shape.BoundBox
stepsX = int(bbox.XLength/delta)
deltaSideX = (bbox.XLength - delta * stepsX) / 2.0
stepsY = int(bbox.YLength/delta)
deltaSideY = (bbox.YLength - delta * stepsY) / 2.0
stepsZ = int(bbox.ZLength/delta)
deltaSideZ = (bbox.ZLength - delta * stepsZ) / 2.0
print("X="+str(stepsX)+" Y="+str(stepsY)+" Z="+str(stepsZ)+" tot="+str(stepsX*stepsY*stepsZ))
# create the 3D array of nodes
isNode=np.full((stepsX+1,stepsY+1,stepsZ+1), False, bool)
# and now iterate to find which point is inside the object 'obj'
pos_x = bbox.XMin + deltaSideX
for step_x in range(0,stepsX+1):
pos_y = bbox.YMin + deltaSideY
for step_y in range(0,stepsY+1):
pos_z = bbox.ZMin + deltaSideZ
for step_z in range(0,stepsZ+1):
# if the point is inside the object shape, or on the surface, flag it
if obj.Shape.isInside(Vector(pos_x,pos_y,pos_z),0.0,True):
isNode[step_x,step_y,step_z] = True
pos_z = pos_z + delta
pos_y = pos_y + delta
pos_x = pos_x + delta
return isNode
def getContainingBBox(objs):
''' Get the bounding box containing all the listed objects
'objs' is the list of FreeCAD objects
Returns the global bounding box.
If the list is None, or is not a list, or if the object have no Shape,
the returned BoundBox is None
'''
# create an empty bbox
gbbox = None
isfirst = True
# if 'objs' is not None
if objs:
if isinstance(objs,list):
for obj in objs:
if hasattr(obj,"Shape"):
if isfirst:
gbbox = obj.Shape.BoundBox
isfirst = False
else:
gbbox.add(obj.Shape.BoundBox)
return gbbox
def createVoxelSpace(bbox,delta):
''' Creates the voxel tensor (3D array) in the given bounding box
'bbox' is the overall FreeCAD.BoundBox bounding box
'delta' is the voxels size length
Returns a voxel tensor as a Numpy 3D array.
If gbbox is None, returns None
'''
if bbox == None:
return None
if delta == None:
return None
# add 1.0 to always cover the bbox space with the voxels
stepsX = int(bbox.XLength/delta + 1.0)
stepsY = int(bbox.YLength/delta + 1.0)
stepsZ = int(bbox.ZLength/delta + 1.0)
# debug
print("X="+str(stepsX)+" Y="+str(stepsY)+" Z="+str(stepsZ)+" tot="+str(stepsX*stepsY*stepsZ))
# create the 3D array of nodes as 16-bit integers (max 65k different conductivities)
voxelSpace=np.full((stepsX+1,stepsY+1,stepsZ+1), 0, np.int16)
return voxelSpace
def voxelizeConductor(obj,condIndex,gbbox,delta,voxelSpace):
''' Voxelize a solid object. The function will modify the 'voxelSpace'
by marking with 'condIndex' all the voxels that sample the object
'obj' internal.
'obj' is the object to voxelize
'condIndex' (integer) is the index of the object. It defines the object conductivity.
'gbbox' (FreeCAD.BoundBox) is the overall bounding box
'delta' is the voxels size length
'voxelSpace' (Numpy 3D array) is the voxel tensor of the overall space
'''
if obj == None:
return
if not hasattr(obj,"Shape"):
return
# get this object bbox
bbox = obj.Shape.BoundBox
# now must find the voxel set that contains the object bounding box
# find the voxel that contains the bbox min point
min_x = int((bbox.XMin - gbbox.XMin)/delta)
min_y = int((bbox.YMin - gbbox.YMin)/delta)
min_z = int((bbox.ZMin - gbbox.ZMin)/delta)
# find the voxel that contains the bbox max point
max_x = int((bbox.XMax - gbbox.XMin)/delta)
max_y = int((bbox.YMax - gbbox.YMin)/delta)
max_z = int((bbox.ZMax - gbbox.ZMin)/delta)
# and now iterate to find which voxel is inside the object 'obj',
# sampling based on the voxel centers
pos_x = gbbox.XMin + min_x * delta + delta/2.0
for step_x in range(min_x,max_x+1):
pos_y = gbbox.YMin + min_y * delta + delta/2.0
for step_y in range(min_y,max_y+1):
pos_z = gbbox.ZMin + min_z * delta + delta/2.0
for step_z in range(min_z,max_z+1):
# if the point is inside the object shape, or on the surface, flag it
if obj.Shape.isInside(Vector(pos_x,pos_y,pos_z),0.0,True):
# debug
#print("pos_x="+str(pos_x)+" pos_y="+str(pos_y)+" pos_z="+str(pos_z))
voxelSpace[step_x,step_y,step_z] = condIndex
pos_z = pos_z + delta
pos_y = pos_y + delta
pos_x = pos_x + delta
def createVoxelShell(obj,condIndex,gbbox,delta,voxelSpace=None):
''' Creates a shell composed by the external faces of a voxelized object.
'obj' is the object whose shell must be created
'condIndex' (integer) is the index of the object. It defines the object conductivity.
'gbbox' (FreeCAD.BoundBox) is the overall bounding box
'delta' is the voxels size length
'voxelSpace' (Numpy 3D array) is the voxel tensor of the overall space
'''
if voxelSpace == None:
return
if not hasattr(obj,"Shape"):
return
surfList = []
# get the object's bbox
bbox = obj.Shape.BoundBox
# now must find the voxel set that contains the object bounding box
# find the voxel that contains the bbox min point
min_x = int((bbox.XMin - gbbox.XMin)/delta)
min_y = int((bbox.YMin - gbbox.YMin)/delta)
min_z = int((bbox.ZMin - gbbox.ZMin)/delta)
# find the voxel that contains the bbox max point
max_x = int((bbox.XMax - gbbox.XMin)/delta)
max_y = int((bbox.YMax - gbbox.YMin)/delta)
max_z = int((bbox.ZMax - gbbox.ZMin)/delta)
# this is half the side of the voxel
halfdelta = delta/2.0
# array to find the six neighbour
sides = [(1,0,0), (-1,0,0), (0,1,0), (0,-1,0), (0,0,1), (0,0,-1)]
# vertexes of the six faces
vertexes = [[Vector(delta,0,0), Vector(delta,delta,0), Vector(delta,delta,delta), Vector(delta,0,delta)],
[Vector(0,0,0), Vector(0,0,delta), Vector(0,delta,delta), Vector(0,delta,0)],
[Vector(0,delta,0), Vector(0,delta,delta), Vector(delta,delta,delta), Vector(delta,delta,0)],
[Vector(0,0,0), Vector(delta,0,0), Vector(delta,0,delta), Vector(0,0,delta)],
[Vector(0,0,delta), Vector(delta,0,delta), Vector(delta,delta,delta), Vector(0,delta,delta)],
[Vector(0,0,0), Vector(0,delta,0), Vector(delta,delta,0), Vector(delta,0,0)]]
# and now iterate to find which voxel is inside the object 'obj',
# sampling based on the voxel centers
vbase = Vector(gbbox.XMin + min_x * delta, gbbox.YMin + min_y * delta, gbbox.ZMin + min_z * delta)
for step_x in range(min_x,max_x+1):
vbase.y = gbbox.YMin + min_y * delta
for step_y in range(min_y,max_y+1):
vbase.z = gbbox.ZMin + min_z * delta
for step_z in range(min_z,max_z+1):
# check if voxel is belonging to the given object
if voxelSpace[step_x,step_y,step_z] == condIndex:
# scan the six neighbour voxels, to see if they are belonging to the same conductor or not.
# If they are not belonging to the same conductor, or if the voxel space is finished, the current voxel
# side in the direction of the empty voxel is an external surface
for side, vertex in zip(sides,vertexes):
is_surface = False
nextVoxelIndexes = [step_x+side[0],step_y+side[1],step_z+side[2]]
if (nextVoxelIndexes[0] > max_x or nextVoxelIndexes[0] < 0 or
nextVoxelIndexes[1] > max_y or nextVoxelIndexes[1] < 0 or
nextVoxelIndexes[2] > max_z or nextVoxelIndexes[2] < 0):
is_surface = True
else:
if voxelSpace[nextVoxelIndexes[0],nextVoxelIndexes[1],nextVoxelIndexes[2]] != condIndex:
is_surface = True
if is_surface == True:
# debug
#print("pos_x="+str(vbase.x)+" pos_y="+str(vbase.y)+" pos_z="+str(vbase.z))
# create the face
# calculate the vertexes
v11 = vbase + vertex[0]
v12 = vbase + vertex[1]
v13 = vbase + vertex[2]
v14 = vbase + vertex[3]
# now make the face
poly = Part.makePolygon( [v11,v12,v13,v14,v11])
face = Part.Face(poly)
surfList.append(face)
vbase.z += delta
vbase.y += delta
vbase.x += delta
# create a shell. Does not need to be solid.
objShell = Part.makeShell(surfList)
return objShell
def findContactVoxelSurfaces(face,condIndex,gbbox,delta,voxelSpace=None,createShell=False):
''' Find the voxel surface sides corresponding to the given contact surface
(face) of an object. The object must have already been voxelized.
'face' is the object face
'condIndex' (integer) is the index of the object to which the face belongs.
It defines the object conductivity.
'gbbox' (FreeCAD.BoundBox) is the overall bounding box
'delta' is the voxels size length
'voxelSpace' (Numpy 3D array) is the voxel tensor of the overall space
'createShell' (bool) creates a shell out of the contact faces
Returns a list of surfaces in the format [x,y,z,voxside] where
x, y, z are the voxel position indexes, while voxside is '+x', '-x',
'+y', '-y', '+z', '-z' according the the impacted surface of the voxel
'''
if voxelSpace == None:
return
surfList = []
contactList = []
# get the face's bbox
bbox = face.BoundBox
# now must find the voxel set that contains the face bounding box
# with a certain slack - it could be the next voxel,
# if the surface is at the boundary between voxels.
# Find the voxel that contains the bbox min point
min_x = int((bbox.XMin - gbbox.XMin)/delta)-1
min_y = int((bbox.YMin - gbbox.YMin)/delta)-1
min_z = int((bbox.ZMin - gbbox.ZMin)/delta)-1
# find the voxel that contains the bbox max point
max_x = int((bbox.XMax - gbbox.XMin)/delta)+1
max_y = int((bbox.YMax - gbbox.YMin)/delta)+1
max_z = int((bbox.ZMax - gbbox.ZMin)/delta)+1
# debug
#print(str(min_x)+" "+str(min_y)+" "+str(min_z)+" "+str(max_x)+" "+str(max_y)+" "+str(max_z))
# create a Part.Vertex that we can use to test the distance
# to the face (as it is a TopoShape)
vec = FreeCAD.Vector(0,0,0)
testVertex = Part.Vertex(vec)
# this is half the side of the voxel
halfdelta = delta/2.0
# small displacement w.r.t. delta
epsdelta = delta/100.0
# array to find the six neighbour
sides = [(1,0,0), (-1,0,0), (0,1,0), (0,-1,0), (0,0,1), (0,0,-1)]
# string describing the side
sideStrs = ['+x', '-x', '+y', '-y', '+z', '-z']
# centers of the sides, with respect to the lower corner (with the smallest coordinates)
sideCenters = [Vector(delta,halfdelta,halfdelta), Vector(0.0,halfdelta,halfdelta),
Vector(halfdelta,delta,halfdelta), Vector(halfdelta,0.0,halfdelta),
Vector(halfdelta,halfdelta,delta), Vector(halfdelta,halfdelta,0.0)]
# vertexes of the six faces (with a slight offset)
vertexes = [[Vector(delta+epsdelta,0,0), Vector(delta+epsdelta,delta,0), Vector(delta+epsdelta,delta,delta), Vector(delta+epsdelta,0,delta)],
[Vector(-epsdelta,0,0), Vector(-epsdelta,0,delta), Vector(-epsdelta,delta,delta), Vector(-epsdelta,delta,0)],
[Vector(0,delta+epsdelta,0), Vector(0,delta+epsdelta,delta), Vector(delta,delta+epsdelta,delta), Vector(delta,delta+epsdelta,0)],
[Vector(0,-epsdelta,0), Vector(delta,-epsdelta,0), Vector(delta,-epsdelta,delta), Vector(0,-epsdelta,delta)],
[Vector(0,0,delta+epsdelta), Vector(delta,0,delta+epsdelta), Vector(delta,delta,delta+epsdelta), Vector(0,delta,delta+epsdelta)],
[Vector(0,0,-epsdelta), Vector(0,delta,-epsdelta), Vector(delta,delta,-epsdelta), Vector(delta,0,-epsdelta)]]
# and now iterate to find which voxel is inside the bounding box of the 'face',
vbase = Vector(gbbox.XMin + min_x * delta, gbbox.YMin + min_y * delta, gbbox.ZMin + min_z * delta)
for step_x in range(min_x,max_x+1):
vbase.y = gbbox.YMin + min_y * delta
for step_y in range(min_y,max_y+1):
vbase.z = gbbox.ZMin + min_z * delta
for step_z in range(min_z,max_z+1):
# check if voxel is belonging to the given object
if voxelSpace[step_x,step_y,step_z] == condIndex:
# scan the six neighbour voxels, to see if they are belonging to the same conductor or not.
# If they are not belonging to the same conductor, or if the voxel space is finished, the current voxel
# side in the direction of the empty voxel is an external surface
for side, sideStr, sideCenter, vertex in zip(sides,sideStrs,sideCenters,vertexes):
is_surface = False
nextVoxelIndexes = [step_x+side[0],step_y+side[1],step_z+side[2]]
if (nextVoxelIndexes[0] > max_x or nextVoxelIndexes[0] < 0 or
nextVoxelIndexes[1] > max_y or nextVoxelIndexes[1] < 0 or
nextVoxelIndexes[2] > max_z or nextVoxelIndexes[2] < 0):
is_surface = True
else:
if voxelSpace[nextVoxelIndexes[0],nextVoxelIndexes[1],nextVoxelIndexes[2]] != condIndex:
is_surface = True
if is_surface == True:
# debug
#print("pos_x="+str(vbase.x)+" pos_y="+str(vbase.y)+" pos_z="+str(vbase.z))
testVertex.Placement.Base = vbase + sideCenter
# if the point is close enough to the face, we consider
# the voxel surface as belonging to the voxelized face
dist = testVertex.distToShape(face)
# debug
#print(str(dist))
if abs(dist[0]) < halfdelta:
contactList.append([step_x,step_y,step_z,sideStr])
if createShell:
# create the face
# calculate the vertexes
v11 = vbase + vertex[0]
v12 = vbase + vertex[1]
v13 = vbase + vertex[2]
v14 = vbase + vertex[3]
# now make the face
poly = Part.makePolygon( [v11,v12,v13,v14,v11])
contFace = Part.Face(poly)
surfList.append(contFace)
vbase.z += delta
vbase.y += delta
vbase.x += delta
contactShell = None
if createShell:
if surfList != []:
# create a shell. Does not need to be solid.
contactShell = Part.makeShell(surfList)
return [contactList,contactShell]
#bb = App.BoundBox();
#
#objects = App.ActiveDocument.findObjects("Part::Feature")
#for object in objects:
# bb.add( object.Shape.BoundBox )
#
#print bb