meshing/remeshing/remeshing.py

Refer to the Remeshing Example.

#!/usr/bin/env python3
 
# $Id$
 
# Copyright (C) 2008-2014, Roman Lygin. All rights reserved.
# Copyright (C) 2014-2023, CADEX. All rights reserved.
 
# This file is part of the CAD Exchanger software.
 
# You may use this file under the terms of the BSD license as follows:
 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
 
 
import sys
from pathlib import Path
import os
 
import cadexchanger.CadExCore as cadex
 
sys.path.append(os.path.abspath(os.path.dirname(Path(__file__).resolve()) + r"/../../"))
import cadex_license as license
 
import typing
 
class MeshReplacementVisitor(cadex.ModelData_Model_VoidElementVisitor):
    def __init__(self):
        super().__init__()
        self.myRootReplacements: typing.Dict[cadex.ModelData_Part, cadex.ModelData_Part] = {}
        self.myInstances: typing.Deque[cadex.ModelData_Instance] = []
        self.myReplacedParts: typing.Dict[cadex.ModelData_Part, cadex.ModelData_Part] = {}
 
    def VisitEnterInstance(self, theInstance: cadex.ModelData_Instance):
        self.myInstances.append(theInstance)
        return True
 
    def VisitLeaveInstance(self, theInstance: cadex.ModelData_Instance):
        self.myInstances.pop()
 
    def VisitPart(self, thePart: cadex.ModelData_Part):
        if thePart.BRepRepresentation().IsNull():
            return
 
        if self.myReplacedParts.get(thePart) and len(self.myInstances) > 0:
            self.myInstances[-1].SetReference(self.myReplacedParts[thePart])
            return
 
        aNewPart = cadex.ModelData_Part(thePart.BRepRepresentation(), thePart.Name())
        aNewPart.SetAppearance(thePart.Appearance())
        aNewPart.AddProperties(thePart.Properties())
        aNewPart.AddPMI(thePart.PMI())
        for anIt in thePart.GetLayerIterator():
            aNewPart.AddToLayer(anIt)
 
        aMesherParams = cadex.ModelAlgo_BRepMesherParameters(cadex.ModelAlgo_BRepMesherParameters.Fine)
        aMesher = cadex.ModelAlgo_BRepMesher(aMesherParams)
        aMesher.Compute(aNewPart)
 
        if len(self.myInstances) == 0:
            self.myRootReplacements[thePart] = aNewPart
        else:
            self.myRootReplacements[thePart] = aNewPart
            self.myInstances[-1].SetReference(aNewPart)
 
 
def main(theSource: str, theDest: str):
    aKey = license.Value()
 
    if not cadex.LicenseManager.Activate(aKey):
        print("Failed to activate CAD Exchanger license.")
        return 1
 
    aReader = cadex.ModelData_ModelReader()
    aModel = cadex.ModelData_Model()
 
    print("Conversion started...")
    # Opening and converting the file
    if not aReader.Read(cadex.Base_UTF16String(theSource), aModel):
        print("Failed to open and convert the file " + theSource)
        return 1
 
    aVisitor = MeshReplacementVisitor()
    aModel.AcceptElementVisitor(aVisitor)
    aNewRoots: typing.List[cadex.ModelData_SceneGraphElement]  = []
    for aRoot in aModel.GetElementIterator():
        if aRoot.TypeId() == cadex.ModelData_Part.GetTypeId():
            aRootPart = cadex.ModelData_Part.Cast(aRoot)
            assert aVisitor.myRootReplacements.get(aRootPart), "Part was not processed"
            aNewRoots.append(aVisitor.myRootReplacements[aRootPart])
        else:
            aNewRoots.append(aRoot)
 
    aModel.Clear()
    for aNewRoot in aNewRoots:
        aModel.AddRoot(aNewRoot)
 
    aWriter = cadex.ModelData_ModelWriter()
    # Converting and writing the model to file
    if not aWriter.Write(aModel, cadex.Base_UTF16String(theDest)):
        print("Failed to convert and write the file to specified format " + theDest)
        return 1
 
    print("Completed")
    return 0
 
if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("    <input_file>  is a name of the SLD file to be read")
        print("    <output_file> is a name of the VRML file to Save() the model")     
        sys.exit(1)
 
    aSource = os.path.abspath(sys.argv[1])
    aDest = os.path.abspath(sys.argv[2])
 
    sys.exit(main(aSource, aDest))