advgeom/meshsimplify/meshsimplify.py

Refer to the Mesh Simplification 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
import cadexchanger.CadExAdvGeom as geom
 
sys.path.append(os.path.abspath(os.path.dirname(Path(__file__).resolve()) + r"/../../"))
import cadex_license as license
 
 
class PolyRepExplorer(cadex.ModelData_Part_VoidRepresentationVisitor):
    def __init__(self):
        super().__init__()
        self.myNumberOfTriangles = 0
 
    def VisitPoly(self, theRep: cadex.ModelData_PolyRepresentation):
        aShapeList = theRep.Get()
        for aShape in aShapeList:
            if aShape.TypeId() == cadex.ModelData_IndexedTriangleSet.GetTypeId():
                anITS = cadex.ModelData_IndexedTriangleSet.Cast(aShape)
                self.myNumberOfTriangles += anITS.NumberOfFaces()
 
class TriangleCounter(cadex.ModelData_Model_VoidElementVisitor):
    def __init__(self):
        super().__init__()
        self.myNumberOfTriangles = 0 
 
    def VisitPart(self, thePart: cadex.ModelData_Part):
        aRepExplorer = PolyRepExplorer()
        thePart.Accept(aRepExplorer)
        self.myNumberOfTriangles += aRepExplorer.myNumberOfTriangles
 
 
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()
 
    # 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
 
    # Basic info about model
    aBeforeCounter = TriangleCounter()
    aModel.AcceptElementVisitor(aBeforeCounter)
    print(f"Model name: {aModel.Name()}")
    print(f"# of triangles before: {aBeforeCounter.myNumberOfTriangles}")
 
    # Running the simplifier
    aParams = geom.ModelSimplifier_MeshSimplifierParameters()
    aParams.SetDegreeOfSimplification(geom.ModelSimplifier_MeshSimplifierParameters.High)
 
    aSimplifier = geom.ModelSimplifier_MeshSimplifier()
    aSimplifier.SetParameters(aParams)
    aNewModel = aSimplifier.Perform(aModel)
 
    # How many shapes does simplified model contain?
    anAfterCounter = TriangleCounter()
    aNewModel.AcceptElementVisitor(anAfterCounter)
    print(f"# of triangles after: {anAfterCounter.myNumberOfTriangles}")
 
    # Saving the simplified model
    if not cadex.ModelData_ModelWriter().Write(aNewModel, cadex.Base_UTF16String(theDest)):
        print("Failed to save the .cdx file")
        return 1
 
    print("Completed")
    return 0
 
if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("    <input_file>  is a name of the VRML file to be read")
        print("    <output_file> is a name of the CDX 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))