subagent transcript

session 17f09f89 · workflow wf_4e894f41

delegated task

You are working on the FreeCAD -> WebAssembly port. Ground EVERYTHING in the real code; do not guess. - Source tree: /home/magik6k/lcad-wasm/freecad-p

▸ Magik

You are working on the FreeCAD -> WebAssembly port. Ground EVERYTHING in the real code; do not guess. - Source tree: /home/magik6k/lcad-wasm/freecad-port/FreeCAD (git branch wasm-port). CMake build dir (out-of-source, already configured): /opt/toolchains/src/freecad-gui-build — read /opt/toolchains/src/freecad-gui-build/CMakeCache.txt for BUILD_* flags and dep paths. Build binary: bin/FreeCAD.wasm (~180 MB). - Toolchain: emscripten, ASYNCIFY + JS exceptions (-fexceptions), SINGLE-THREADED (no pthreads). Static CPython 3.14 + static Qt 6.11 (wasm) + static OCCT + static Coin3D. Everything is statically linked; there is NO dlopen — Python C-extension modules are registered statically via PyImport_AppendInittab in the generated file src/Main/WasmInittab.cpp / WasmInittabGui.cpp (see also freecadWasmRegisterInittab in src/Main/MainGui.cpp). - CRITICAL wasm constraints you MUST check for and design around: (1) THREADING HANGS: any std::thread ctor / std::async(default or async policy) / QThreadPool / QtConcurrent / QThread worker HANGS or throws (no pthreads). Fix pattern: force synchronous/deferred on __EMSCRIPTEN__ (e.g. std::launch::deferred), or #ifndef FC_OS_WASM guard the worker and run inline. Example already in-tree: Mod/Sketcher/App/planegcs/GCS.cpp forced std::launch::deferred; App/Application.cpp guards _recomputeThread with #ifndef FC_OS_WASM; Gui/ProgressBar.cpp skips qApp->processEvents() on __EMSCRIPTEN__. (2) MODAL DIALOGS / NESTED EVENT LOOPS: QDialog::exec()/QMessageBox::exec()/QEventLoop::exec() may deadlock under asyncify when driven from outside the main loop. Task-panel (docked, non-modal) dialogs are preferred. (3) Reentrant ccalls from JS during asyncify suspend corrupt state — a QTimer command-pump (/fc-cmd.py) exists for JS->Python. QtWebEngine has NO wasm port (Web workbench / in-app help / real Start page can't use it). (4) Wasm guards used in-tree: __EMSCRIPTEN__ (compiler-provided) and FC_OS_WASM (FreeCAD-defined) — both are defined on wasm. - Built modules today: Part, Sketcher, Material, Start (+ kernel). Everything else is OFF (see BUILD_* in CMakeCache). - PySide/shiboken: FREECAD_USE_PYSIDE=OFF, FREECAD_USE_SHIBOKEN=OFF, PySide6_DIR/Shiboken6_DIR NOTFOUND. Python 'PySide'/'shiboken6' import fails at runtime ("Cannot load shiboken6"). Many workbenches (Draft, BIM, most task dialogs) are Python+PySide and cannot function without it. DELIVERABLES — do BOTH: 1) Write a thorough, concrete, ready-to-apply plan to /home/magik6k/lcad-wasm/porting/<SLUG>/plan.md — include: exact CMake flags/edits, exact source edits (file + before/after or unified-diff snippets precise enough to apply), any NEW files (full contents), external-dependency build recipes (how to build each dep for this emscripten/asyncify toolchain), a threading-hazard list (grep the real files, give file:line + the exact construct + the exact fix), a modal-dialog-hazard list, the PyImport_AppendInittab lines to add, an ordered step list, and an effort/risk estimate. Put any patch files or new-file contents as separate files in that dir too. 2) Return the structured summary (the schema). Keep summary fields concise; the depth goes in plan.md. Your returned text IS the structured object. Be exhaustive and correct — token cost is not a concern. Verify claims against the actual files (use grep/read). If a dependency has no known wasm port, say so plainly and estimate the porting effort. === YOUR SCOPE: Mesh / MeshPart (+ SMESH/netgen) (slug: mesh) === Mesh/MeshPart are OFF. Identify the external deps (SMESH, netgen, and whatever meshing libs), their wasm-port status (likely none — assess effort to port each to emscripten, incl. their own threading/omp), cmake flags, and what subset of Mesh works WITHOUT the heavy meshers (basic mesh display/import). Be honest about the dependency cliff. Write your full plan + any patch/new-file contents under /home/magik6k/lcad-wasm/porting/mesh/ (create the dir; plan.md is required). Then return the structured summary with deliverableFile=/home/magik6k/lcad-wasm/porting/mesh/plan.md.

Fable

thinking

I'm diving into the FreeCAD source to examine the Mesh and MeshPart modules and understand the current build setup, then running parallel investigations to speed things up.

Fable

I'll ground this in the real code. Let me start by exploring the Mesh/MeshPart modules and the build config.

Fable

⚙ Bash

{"command": "ls src/Mod/ && echo \"---MESH---\" && ls src/Mod/Mesh/ && echo \"---MESHPART---\" && ls src/Mod/MeshPart/ 2>/dev/null && echo \"---CMAKECACHE grep---\" && grep -iE \"BUILD_MESH|BUILD_SMESH|BUILD_POINTS|SMESH|NETGEN|BUILD_FEM\" …

tool result

AddonManager
Assembly
BIM
CAM
CMakeLists.txt
Draft
Fem
Help
Import
Inspection
JtReader
Material
Measure
Mesh
MeshPart
OpenSCAD
Part
PartDesign
Plot
Points
ReverseEngineering
Robot
Show
Sketcher
Spreadsheet
Start
Surface
TechDraw
TemplatePyMod
Test
Tux
Web
__init__.py
mod.dox
---MESH---
App
BuildRegularGeoms.py
CMakeLists.txt
Gui
Init.py
InitGui.py
MeshEnums.py
MeshGlobal.h
MeshTestsGui.py
mesh.dox
---MESHPART---
App
CMakeLists.txt
Gui
Init.py
InitGui.py
MeshPartGlobal.h
meshpart.dox
---CMAKECACH  …[truncated]

Fable

⚙ Bash

{"command": "grep -rn \"BUILD_MESH\\|BUILD_SMESH\\|BUILD_MESH_PART\\|BUILD_POINTS\" CMakeLists.txt src/Mod/Mesh/CMakeLists.txt src/Mod/MeshPart/CMakeLists.txt 2>/dev/null | head -50", "description": "Grep build options in CMake"}

Fable

⚙ Bash {"command": "mkdir -p /home/magik6k/lcad-wasm/porting/mesh && echo created", "description": "Create porting dir"}

tool result

(Bash completed with no output)

tool result

created

Fable

thinking

I'm diving into the CMakeLists files for Mesh and MeshPart to understand their dependencies, then checking the App directories and locating SMESH.

Fable

⚙ Bash

{"command": "echo \"===MESH CMake===\" && sed -n '1,120p' src/Mod/Mesh/CMakeLists.txt", "description": "Read Mesh CMakeLists"}

Fable

⚙ Bash

{"command": "echo \"===MESHPART CMake===\" && cat src/Mod/MeshPart/CMakeLists.txt", "description": "Read MeshPart CMakeLists"}

tool result

===MESH CMake===
# SPDX-License-Identifier: LGPL-2.1-or-later

add_subdirectory(App)
if(BUILD_GUI)
    add_subdirectory(Gui)
endif(BUILD_GUI)

set(Mesh_Scripts
    Init.py
    BuildRegularGeoms.py
    MeshEnums.py
    App/MeshTestsApp.py
)

set(MeshTestDataFiles
    App/TestData/NASTRAN_Test_GRID_CQUAD4.bdf
    App/TestData/NASTRAN_Test_Delimited_GRID_CQUAD4.bdf
    App/TestData/NASTRAN_Test_GRIDSTAR_CQUAD4.bdf
    App/TestData/NASTRAN_Test_GRID_CTRIA3.bdf
)

if(BUILD_GUI)
    list (APPEND Mesh_  …[truncated]

tool result

===MESHPART CMake===
# SPDX-License-Identifier: LGPL-2.1-or-later

add_subdirectory(App)
if(BUILD_GUI)
    add_subdirectory(Gui)
endif(BUILD_GUI)

INSTALL(
    FILES
        Init.py
        InitGui.py
    DESTINATION
        Mod/MeshPart
)

Fable

⚙ Bash

{"command": "echo \"===top CMake mesh refs===\" && grep -n \"MESH\\|SMESH\\|Points\\|POINTS\" CMakeLists.txt | head -40", "description": "Grep top CMakeLists for mesh"}

tool result

===top CMake mesh refs===
140:        # Do this before the check for SMESH because it depends on vtk
145:    SetupSalomeSMESH()
148:        if (NOT FREECAD_USE_EXTERNAL_SMESH)

Fable

⚙ Bash {"command": "sed -n '100,210p' CMakeLists.txt", "description": "Read CMake SMESH/mesh region"}

tool result

        list(FIND _args ALIAS _als)
        if(_imp EQUAL -1 AND _ifc EQUAL -1 AND _als EQUAL -1)
            list(TRANSFORM _args REPLACE "^(SHARED|MODULE)$" "STATIC")
        endif()
        _add_library(${name} ${_args})
    endfunction()
endif()

# include local modules
include(CheckCXXCompilerFlag)
include(AddFileDependencies)
include(cMake/FreeCadMacros.cmake)
# include helper functions/macros
add_subdirectory(cMake/FreeCAD_Helpers)

list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DI  …[truncated]

Fable

⚙ Bash

{"command": "grep -n \"MESH\\|SMESH\\|Mesh\\|Points\\|POINTS\\|FEM\\|Fem\\|Netgen\\|NETGEN\\|vtk\\|VTK\" CMakeLists.txt | sed -n '1,80p'", "description": "Grep all mesh-related lines top CMake"}

tool result

140:        # Do this before the check for SMESH because it depends on vtk
145:    SetupSalomeSMESH()
146:    if (BUILD_FEM_NETGEN)
147:        set(NETGEN_DEFINITIONS -DNO_PARALLEL_THREADS -DOCCGEOMETRY)
148:        if (NOT FREECAD_USE_EXTERNAL_SMESH)
149:            find_package(NETGEN REQUIRED)

Fable

thinking

I need to check the CMakeLists files for the Mesh and MeshPart modules to figure out whether the basic Mesh module actually requires SMESH as a dependency.

Fable

⚙ Bash

{"command": "cat cMake/FreeCAD_Helpers/SetupSalomeSMESH.cmake 2>/dev/null; echo \"===find macro===\"; grep -rln \"SetupSalomeSMESH\\|macro(SetupSalomeSMESH\\|function(SetupSalomeSMESH\" cMake/ ", "description": "Read SetupSalomeSMESH macro"…

tool result

macro(SetupSalomeSMESH)
# -------------------------------- Salome SMESH --------------------------
    # Salome SMESH sources are under src/3rdParty now
    if(FREECAD_USE_SMESH)

        # set the internal smesh version:
        # see src/3rdParty/salomonemesh/CMakeLists.txt and commit https://github.com/FreeCAD/FreeCAD/commit/666a3e5 and https://forum.freecad.org/viewtopic.php?f=10&t=30838
        set(SMESH_VERSION_MAJOR 7)
        set(SMESH_VERSION_MINOR 7)
        set(SMESH_VERSION_PATCH 1)
  …[truncated]

Fable

⚙ Bash

{"command": "echo \"===MESH/App CMake===\" && sed -n '1,140p' src/Mod/Mesh/App/CMakeLists.txt", "description": "Read Mesh App CMakeLists"}

tool result

===MESH/App CMake===
# SPDX-License-Identifier: LGPL-2.1-or-later

add_library(Mesh SHARED)

if(WIN32)
    add_definitions(-DFCAppMesh -DWM4_FOUNDATION_DLL_EXPORT)
endif(WIN32)

target_include_directories(
    Mesh
    PRIVATE
    ${CMAKE_CURRENT_BINARY_DIR}
    ${CMAKE_CURRENT_SOURCE_DIR}
)

target_include_directories(
    Mesh
    SYSTEM
    PUBLIC
    ${KDTREE_INCLUDE_DIRS}
    ${EIGEN3_INCLUDE_DIR}
    ${QtConcurrent_INCLUDE_DIRS}
)

set(Mesh_LIBS
    FreeCADBase
    FreeCADApp
)

list(APPEN  …[truncated]

Fable

thinking

The Mesh module itself only depends on FreeCADBase, FreeCADApp, and QtConcurrent—not SMESH. SMESH is only pulled in by MeshPart for surface meshing and by FEM. I need to verify the MeshPart CMakeLists to confirm the SMESH dependency there and check where QtConcurrent is actually used in the Mesh module, then track down where FREECAD_USE_SMESH is defined.

Fable

The Mesh App module depends only on FreeCADBase/FreeCADApp + QtConcurrent — NOT SMESH. Let me verify MeshPart's SMESH dependency and where FREECAD_USE_SMESH is set.

Fable

⚙ Bash

{"command": "grep -rn \"FREECAD_USE_SMESH\\|BUILD_SMESH\" cMake/ CMakeLists.txt | head -30", "description": "Find FREECAD_USE_SMESH definition"}

tool result

cMake/FreeCAD_Helpers/PrintFinalReport.cmake:88:    value(BUILD_SMESH)
cMake/FreeCAD_Helpers/PrintFinalReport.cmake:152:    if(FREECAD_USE_SMESH)
cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake:219:        set(FREECAD_USE_SMESH ON)
cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake:221:            set(BUILD_SMESH OFF)
cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake:223:            set(BUILD_SMESH ON)
cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake:226:         …[truncated]

Fable

⚙ Bash

{"command": "echo \"===MESHPART/App CMake===\" && cat src/Mod/MeshPart/App/CMakeLists.txt", "description": "Read MeshPart App CMakeLists"}

tool result

===MESHPART/App CMake===
# SPDX-License-Identifier: LGPL-2.1-or-later

add_library(MeshPart SHARED)

if (SMESH_FOUND)
    add_definitions(-DHAVE_SMESH)
    if(SMESH_VERSION_MAJOR LESS_EQUAL 9 AND SMESH_VERSION_MINOR LESS 10 )
      add_definitions(-DHAVE_MEFISTO)
    endif()
endif(SMESH_FOUND)

if(BUILD_FEM_NETGEN)
    add_definitions(-DHAVE_NETGEN)
endif(BUILD_FEM_NETGEN)

target_include_directories(
    MeshPart
    PRIVATE
    ${CMAKE_BINARY_DIR}
    ${CMAKE_SOURCE_DIR}/src
    ${pybind11_INC  …[truncated]

Fable

thinking

So MeshPart can actually function without SMESH since it falls back to OCCT's built-in meshing capabilities through BRepMesh for basic shape-to-mesh conversion. The code uses conditional compilation guards to handle both scenarios. Let me check how Mesher.cpp handles these guards and what functionality remains available without SMESH.

Now I'm looking at the FreeCAD build configuration to understand when FREECAD_USE_SMESH gets enabled.

Fable

⚙ Bash

{"command": "sed -n '200,235p' cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake", "description": "Read FREECAD_USE_SMESH logic"}

tool result

    endif()

    if(APPLE AND FREECAD_USE_3DCONNEXION_LEGACY)
        find_library(3DCONNEXIONCLIENT_FRAMEWORK 3DconnexionClient)
        if(NOT (IS_DIRECTORY ${3DCONNEXIONCLIENT_FRAMEWORK}))
            set(FREECAD_USE_3DCONNEXION_LEGACY OFF)
        endif()
    endif()

    if(MSVC)
        option(BUILD_FEM_NETGEN "Build the FreeCAD FEM module with the NETGEN mesher" ON)
        option(FREECAD_USE_PCL "Build the features that use PCL libs" OFF)
    endif(MSVC)
    if(NOT MSVC)
        option(B  …[truncated]

Fable

⚙ Bash

{"command": "grep -n \"HAVE_SMESH\\|HAVE_NETGEN\\|HAVE_MEFISTO\\|SMESH\\|NETGEN\\|Mefisto\" src/Mod/MeshPart/App/Mesher.cpp src/Mod/MeshPart/App/Mesher.h | head -60", "description": "Grep SMESH guards in Mesher"}

tool result

src/Mod/MeshPart/App/Mesher.h:31:#ifdef HAVE_SMESH
src/Mod/MeshPart/App/Mesher.h:32:# include <SMESH_Version.h>
src/Mod/MeshPart/App/Mesher.h:36:class SMESH_Gen;
src/Mod/MeshPart/App/Mesher.h:37:class SMESH_Mesh;
src/Mod/MeshPart/App/Mesher.h:52:        Mefisto = 1,
src/Mod/MeshPart/App/Mesher.h:53:#if defined(HAVE_NETGEN)
src/Mod/MeshPart/App/Mesher.h:71:    /** @name Mefisto settings */
src/Mod/MeshPart/App/Mesher.h:153:#if defined(HAVE_NETGEN)
src/Mod/MeshPart/App/Mesher.h:219:    Mes  …[truncated]

Fable

thinking

I'm seeing a key insight about the build configuration: enabling BUILD_MESH_PART automatically forces FREECAD_USE_SMESH to ON, even though the actual code in Mesher.cpp is designed to handle cases where SMESH isn't available—it just throws an error at runtime. So there's a mismatch between what the CMake logic enforces and what the code can technically support.

To decouple MeshPart from SMESH, I'd need to modify the CMake configuration file to allow them to be independent. But first, I should check whether the "Standard" meshing algorithm in Mesher.cpp—which uses OCCT's built-in BRepMesh—can actually work without SMESH, and what algorithms are available in the Mesher class.

Fable

⚙ Bash {"command": "sed -n '40,80p' src/Mod/MeshPart/App/Mesher.h", "description": "Read Mesher algorithm enum"}

tool result

{
class MeshObject;
}
namespace MeshPart
{

class Mesher
{
public:
    enum Method
    {
        None = 0,
        Mefisto = 1,
#if defined(HAVE_NETGEN)
        Netgen = 2,
#endif
        Standard = 3
    };

    explicit Mesher(const TopoDS_Shape&);
    ~Mesher();

    void setMethod(Method m)
    {
        method = m;
    }
    Method getMethod() const
    {
        return method;
    }

    /** @name Mefisto settings */
    //@{
    void setMaxLength(double s)  …[truncated]

Fable

⚙ Bash

{"command": "grep -n \"case Standard\\|Standard\\|BRepMesh\\|Algorithm\\b\\|::execute\\|void Mesher::\\|MeshObject\\* Mesher::\" src/Mod/MeshPart/App/Mesher.cpp | head -50", "description": "Grep Mesher methods and Standard algo"}

tool result

27:#include <BRepMesh_IncrementalMesh.hxx>
29:#include <Standard_Version.hxx>
35:#include <Mod/Part/App/BRepMesh.h>
141:        Part::BRepMesh mesh;
182:                [](const Part::BRepMesh::Segment& segm) {
227:Mesh::MeshObject* Mesher::createStandard() const
231:        BRepMesh_IncrementalMesh aMesh(shape, deflection, relative, angularDeflection);
241:Mesh::MeshObject* Mesher::createMesh() const
244:    if (method == Standard) {
245:        return createStandard();
431:Mesh::Mesh  …[truncated]

Fable

thinking

So the "Standard" mesher bypasses SMESH entirely and calls OCCT's `BRepMesh_IncrementalMesh` directly through the `createStandard()` method. Now I need to trace through the actual implementation in Mesher.cpp to see how the threading and mesh generation work together.

Fable

⚙ Bash {"command": "sed -n '125,250p' src/Mod/MeshPart/App/Mesher.cpp", "description": "Read Mesher createMesh/createStandard"}

tool result

class BrepMesh
{
    bool segments;
    std::vector<uint32_t> colors;

public:
    BrepMesh(bool s, const std::vector<uint32_t>& c)
        : segments(s)
        , colors(c)
    {}

    Mesh::MeshObject* create(const std::vector<Part::TopoShape::Domain>& domains) const
    {
        std::vector<Base::Vector3d> points;
        std::vector<Part::TopoShape::Facet> facets;
        Part::BRepMesh mesh;
        mesh.getFacesFromDomains(domains, points, facets);

        MeshCore::Mes  …[truncated]

Fable

thinking

I'm getting a clearer picture of the codebase structure now. Let me search through the Mesh and MeshPart modules to identify any threading issues, particularly around QtConcurrent usage.

Fable

Now let me hunt threading hazards across Mesh and MeshPart, and check QtConcurrent usage.

Fable

⚙ Bash

{"command": "grep -rn \"QtConcurrent\\|QThreadPool\\|QThread\\|std::thread\\|std::async\\|QFuture\\|#include <thread>\\|#include <future>\\|omp \\|#pragma omp\\|pthread\" src/Mod/Mesh/ src/Mod/MeshPart/ 2>/dev/null", "description": "Grep th…

tool result

src/Mod/Mesh/App/CMakeLists.txt:22:    ${QtConcurrent_INCLUDE_DIRS}
src/Mod/Mesh/App/CMakeLists.txt:31:    ${QtConcurrent_LIBRARIES}
src/Mod/Mesh/App/Core/Builder.cpp:368:    int threads = int(std::thread::hardware_concurrency());
src/Mod/Mesh/App/Core/Curvature.cpp:29:#include <QFuture>
src/Mod/Mesh/App/Core/Curvature.cpp:30:#include <QFutureWatcher>
src/Mod/Mesh/App/Core/Curvature.cpp:31:#include <QtConcurrentMap>
src/Mod/Mesh/App/Core/Curvature.cpp:85:        QFuture<CurvatureInfo> future
sr  …[truncated]

Fable

thinking

I'm identifying specific threading hazards in the codebase. The first issue is in Builder.cpp where `hardware_concurrency()` is called—it can return 0 or 1, so I need to check how that value gets used downstream. Then there's QtConcurrent::mapped with QFutureWatcher in Curvature.cpp, which is a clear concurrency problem. Finally, std::async with std::launch::async in Functional.h creates another hazard I need to examine.

Fable

⚙ Bash

{"command": "echo \"===Builder.cpp 355-400===\"; sed -n '355,400p' src/Mod/Mesh/App/Core/Builder.cpp; echo \"===Evaluation.cpp 980-1030===\"; sed -n '980,1035p' src/Mod/Mesh/App/Core/Evaluation.cpp", "description": "Read Builder and Evaluat…

tool result

===Builder.cpp 355-400===
    }
}

void MeshFastBuilder::Finish()
{
    using size_type = QVector<Private::Vertex>::size_type;
    QVector<Private::Vertex>& verts = p->verts;
    size_type ulCtPts = verts.size();
    for (size_type i = 0; i < ulCtPts; ++i) {
        verts[i].i = i;
    }

    // std::sort(verts.begin(), verts.end());
    int threads = int(std::thread::hardware_concurrency());
    MeshCore::parallel_sort(verts.begin(), verts.end(), std::less<>(), threads);

    QV  …[truncated]

Fable

⚙ Bash

{"command": "echo \"===Functional.h===\"; cat src/Mod/Mesh/App/Core/Functional.h; echo \"===where used===\"; grep -rn \"parallel_sort\\|Functional.h\\|MeshCore::parallel\" src/Mod/Mesh/ ", "description": "Read Functional.h and usages"}

tool result

===Functional.h===
// SPDX-License-Identifier: LGPL-2.1-or-later

/***************************************************************************
 *   Copyright (c) 2018 Werner Mayer <wmayer[at]users.sourceforge.net>     *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redis  …[truncated]

Fable

thinking

I'm spotting a critical issue in `Functional.h` with the `parallel_sort` function — when `std::async` is called without an explicit launch policy, it defaults to allowing either async or deferred execution, which means the implementation might spawn threads that hang on WebAssembly. The problematic branches are the initial call and the `threads==2` case, both using `std::async` without a policy, while the `threads>2` branch explicitly specifies `std::launch::async`, guaranteeing thread creation and the hang.

However, there's a potential safety net: on Emscripten without pthread support, `std::thread::hardware_concurrency()` returns 1, which would cause `parallel_sort` to fall back to plain   …

Fable

⚙ Bash

{"command": "echo \"===Curvature.cpp 70-110===\"; sed -n '70,110p' src/Mod/Mesh/App/Core/Curvature.cpp; echo \"===ViewProvider.cpp QtConcurrent usage===\"; grep -n \"QtConcurrent\\|QFuture\\|watcher\\|\\.result\\|blockSignals\" src/Mod/Mesh…

tool result

===Curvature.cpp 70-110===
{
    myCurvature.clear();
    MeshRefPointToFacets search(myKernel);
    FacetCurvature face(myKernel, search, myRadius, myMinPoints);

    if (!parallel) {
        Base::SequencerLauncher seq("Curvature estimation", mySegment.size());
        for (FacetIndex it : mySegment) {
            CurvatureInfo info = face.Compute(it);
            myCurvature.push_back(info);
            seq.next();
        }
    }
    else {
        // NOLINTBEGIN
        QFuture<CurvatureInf  …[truncated]

Fable

thinking

I'm checking the `parallel` flag in Curvature.cpp to see if we can disable it for WebAssembly, and tracing where it originates from the constructor. ViewProvider.cpp includes QtConcurrent but doesn't actually use it, so I need to verify that. I should also look at the Mesh GUI CMakeLists to understand the dependencies like Coin3D and what the SM module requires.

Now I'm examining the 3rdParty directory to gauge how much work porting SMESH itself would entail, and checking the WasmInittab to see how Part and Sketcher modules are registered.

Fable

⚙ Bash

{"command": "echo \"===Curvature parallel flag===\"; grep -n \"parallel\" src/Mod/Mesh/App/Core/Curvature.cpp src/Mod/Mesh/App/Core/Curvature.h; echo \"===ViewProvider actual QtConcurrent calls===\"; grep -n \"QtConcurrent::\\|QFuture<\\|ma…

tool result

===Curvature parallel flag===
src/Mod/Mesh/App/Core/Curvature.h:70:    void ComputePerFace(bool parallel);
src/Mod/Mesh/App/Core/Curvature.cpp:69:void MeshCurvature::ComputePerFace(bool parallel)
src/Mod/Mesh/App/Core/Curvature.cpp:75:    if (!parallel) {
===ViewProvider actual QtConcurrent calls===

Fable

⚙ Bash

{"command": "echo \"===3rdParty salomesmesh size===\"; ls src/3rdParty/ 2>/dev/null; echo \"---\"; du -sh src/3rdParty/salomesmesh 2>/dev/null; echo \"===smesh file count===\"; find src/3rdParty/salomesmesh -name \"*.cpp\" 2>/dev/null | wc …

tool result

===3rdParty salomesmesh size===
3Dconnexion
CMakeLists.txt
Clipper2
FastSignals
GSL
OndselSolver
OpenGL
PyCXX
coin
json
lazy_loader
libE57Format
libkdtree
lru-cache
pivy
salomesmesh
zipios++
---
8.3M	src/3rdParty/salomesmesh
===smesh file count===
186
src/3rdParty/salomesmesh/src/SMDS/SMDS_BallElement.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_Downward.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_EdgePosition.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_FaceOfEdges.cpp
src/3rdParty/salomesmesh/src/S  …[truncated]

Fable

thinking

ViewProvider.cpp has an unused QtConcurrent include that I can remove. For Curvature.cpp, the parallel flag is passed as a parameter, so I can handle the WebAssembly case by forcing parallel=false directly in the ComputePerFace function. Now I'm looking at the SMESH bundled library—it's quite large at 8.3MB with 186 C++ files, and I need to check whether the bundled version actually requires MED file support and HDF5 dependencies or if those are optional.

I'm also tracing the netgen dependency—it's disabled (BUILD_FEM_NETGEN is OFF) and loaded as an external package, so it's not bundled. For MeshPart with SMESH but without netgen, we get StdMeshers, SMESH, and SMDS, with Mefisto available s  …

Fable

⚙ Bash

{"command": "grep -n \"add_library\\|add_subdirectory\\|MEDFile\\|HDF5\\|hdf5\\|VTK\\|vtk\\|target_link\\|MED\\|Boost\\|OpenMP\\|pthread\\|find_package\" src/3rdParty/salomesmesh/CMakeLists.txt | head -60", "description": "Grep SMESH deps i…

tool result

65:if (VTK_OPTIONS)
66:    add_definitions(${VTK_OPTIONS})
80:    ${Boost_INCLUDE_DIRS}
85:    ${VTK_INCLUDE_DIRS}
86:    ${HDF5_INCLUDE_DIR}
87:    ${MEDFILE_INCLUDE_DIRS}
188:TARGET_LINK_LIBRARIES(SMDS ${SMESH_LIBS} ${HDF5_C_STATIC_LIBRARY} ${VTK_LIBRARIES})
213:TARGET_LINK_LIBRARIES(DriverSTL ${SMESH_LIBS} Driver SMDS ${Boost_LIBRARIES})
249:TARGET_LINK_LIBRARIES(SMESHDS ${SMESH_LIBS} SMDS ${Boost_LIBRARIES} )
258:TARGET_LINK_LIBRARIES(SMESH SMDS SMESHDS  Driver DriverSTL DriverDAT DriverUNV   …[truncated]

Fable

⚙ Bash

{"command": "echo \"===subdirs===\"; ls src/3rdParty/salomesmesh/src/; echo \"===StdMeshers deps on netgen/med===\"; grep -rln \"MED\\|libmed\\|DriverMED\\|#include.*med\" src/3rdParty/salomesmesh/src/ | head; echo \"===thread/omp in smesh=…

tool result

===subdirs===
Controls
Driver
DriverDAT
DriverSTL
DriverUNV
MEFISTO2
NETGEN
NETGENPlugin
SMDS
SMESH
SMESHDS
StdMeshers
===StdMeshers deps on netgen/med===
src/3rdParty/salomesmesh/src/NETGENPlugin/NETGENPlugin_Mesher.cpp
src/3rdParty/salomesmesh/src/SMESH/MED_Utilities.cpp
src/3rdParty/salomesmesh/src/SMESH/MED_Factory.cpp
src/3rdParty/salomesmesh/src/SMESH/MED_GaussDef.cpp
src/3rdParty/salomesmesh/src/SMESH/DriverMED_Family.cpp
src/3rdParty/salomesmesh/src/SMESH/MED_GaussUtils.cpp
src/3rdParty/  …[truncated]

Fable

thinking

The bundled SMESH brings in a substantial set of dependencies—VTK, HDF5, MEDFile, Boost, and OpenCascade—that create a significant challenge for WebAssembly compilation. VTK is particularly problematic since it's a massive C++ visualization library without straightforward emscripten support, though recent versions like VTK 9.3+ do offer WebAssembly builds that would require careful module selection and integration with FreeCAD's static linking. HDF5, which MEDFile depends on, presents its own compilation hurdles for the browser environment.

The core issue is that SMDS—the fundamental data structure layer of SMESH—actually requires VTK internally; it uses vtkUnstructuredGrid for managing dow  …

Fable

⚙ Bash

{"command": "echo \"===SMDS uses vtk?===\"; grep -rln \"vtkUnstructuredGrid\\|#include <vtk\\|#include \\\"vtk\" src/3rdParty/salomesmesh/src/SMDS/ | head; echo \"===thread usage SMESH_Mesh===\"; grep -n \"thread\\|async\\|omp\\|parallel\\|…

tool result

===SMDS uses vtk?===
src/3rdParty/salomesmesh/src/SMDS/SMDS_BallElement.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_Mesh0DElement.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_Downward.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_MeshNodeIDFactory.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_MeshNode.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_MeshElementIDFactory.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_VtkFace.cpp
src/3rdParty/salomesmesh/src/SMDS/SMDS_VtkCellIterator.cpp
src/3rdParty/salomesmesh/src  …[truncated]

Fable

⚙ Bash

{"command": "echo \"===toolchain deps present?===\"; ls /opt/toolchains/ 2>/dev/null; echo \"---boost/vtk/hdf5 in cache---\"; grep -iE \"Boost_INCLUDE|VTK_DIR|VTK_INCLUDE|HDF5|MEDFile|MEDFILE|Eigen3|EIGEN\" /opt/toolchains/src/freecad-gui-b…

tool result

===toolchain deps present?===
boost-wasm
emsdk
fix-freetype-sjlj.sh
fmt-wasm
freecad-gui-web
gtest-wasm
icu-wasm
include
occt-wasm
oscad-deps
oscad-src
python-wasm
qt
qt-asyncify
qt-jspi
qtsrc
rebuild-deps-407.sh
rebuild-deps-jseh.sh
rebuild-deps-wasmeh.sh
rebuild-qt-asyncify-412.sh
rebuild-qt-asyncify.sh
rebuild-qt-jspi-jseh.sh
rebuild-qt-jspi-wasmeh.sh
rebuild-qt-jspi.sh
src
venv
wasm-opt-4.0.12.bak
xerces-wasm
yaml-wasm
---boost/vtk/hdf5 in cache---
CMAKE_CXX_FLAGS:STRING=-fexceptions -DEIGEN  …[truncated]

Fable

thinking

I'm identifying the core blockers: SMDS relies heavily on VTK as a hard dependency for its data structures, and SMESH_Mesh spawns actual threads using boost that will hang in WebAssembly environments. The toolchain setup appears incomplete in the thinking.

However, there's a viable path forward: the Mesh module itself has no SMESH dependency and only needs FreeCADBase, FreeCADApp, QtConcurrent, and Coin3D—all already available. MeshPart can be decoupled from SMESH to use only OCCT's BRepMesh for shape-to-mesh conversion, which means I can build the Mesh module as a complete tier-1 feature with just threading fixes, then add MeshPart as tier-2 by conditionally excluding SMESH through CMake c  …

Fable

⚙ Bash

{"command": "echo \"===Mesh Gui CMake libs===\"; grep -n \"Mesh_Gui_LIBS\\|target_link_libraries\\|_LIBS\\|Coin\\|Part\\b\\|SoQt\\|QtConcurrent\" src/Mod/Mesh/Gui/CMakeLists.txt | head -30; echo \"===MeshPart Gui CMake libs===\"; grep -n \"…

tool result

===Mesh Gui CMake libs===
9:set(MeshGui_LIBS
168:target_link_libraries(MeshGui ${MeshGui_LIBS})
===MeshPart Gui CMake libs===
3:if (SMESH_FOUND)
4:    add_definitions(-DHAVE_SMESH)
5:    if(SMESH_VERSION_MAJOR LESS_EQUAL 9 AND SMESH_VERSION_MINOR LESS 10 )
8:endif(SMESH_FOUND)
14:set(MeshPartGui_LIBS
79:target_link_directories(MeshPartGui PUBLIC ${SMESH_LIB_PATH})
80:target_link_libraries(MeshPartGui ${MeshPartGui_LIBS})

Fable

⚙ Bash

{"command": "echo \"===WasmInittab===\"; sed -n '1,80p' src/Main/WasmInittab.cpp 2>/dev/null; echo \"===WasmInittabGui===\"; cat src/Main/WasmInittabGui.cpp 2>/dev/null | head -60", "description": "Read WasmInittab files"}

tool result

===WasmInittab===
===WasmInittabGui===

Fable

⚙ Bash

{"command": "echo \"===MeshGui_LIBS===\"; sed -n '9,40p' src/Mod/Mesh/Gui/CMakeLists.txt; echo \"===MeshPartGui_LIBS===\"; sed -n '14,40p' src/Mod/MeshPart/Gui/CMakeLists.txt", "description": "Read Gui LIBS lists"}

tool result

===MeshGui_LIBS===
set(MeshGui_LIBS
    ${Boost_LIBRARIES}
    ${OPENGL_glu_LIBRARY}
    Mesh
    FreeCADGui
)

generate_from_py(ViewProviderMesh)

SET(MeshGui_XML_SRCS
    ViewProviderMesh.pyi
)
SOURCE_GROUP("XML" FILES ${MeshGui_XML_SRCS})

set(Dialogs_UIC_SRCS
    DlgEvaluateMesh.ui
    DlgEvaluateSettings.ui
    DlgRegularSolid.ui
    DlgSettingsMeshView.ui
    DlgSettingsImportExport.ui
    DlgDecimating.ui
    DlgSmoothing.ui
    RemoveComponents.ui
    RemeshGmsh.ui
    Segmentation.ui
    …[truncated]

Fable

⚙ Bash

{"command": "echo \"===find inittab files===\"; find src/Main -iname \"*nittab*\" -o -iname \"*Wasm*\" 2>/dev/null; echo \"===grep AppendInittab===\"; grep -rln \"PyImport_AppendInittab\\|freecadWasmRegisterInittab\\|Inittab\" src/Main/ 2>/…

tool result

===find inittab files===
===grep AppendInittab===
src/Main/CMakeLists.txt
src/Main/MainCmd.cpp
src/Main/MainGui.cpp

Fable

thinking

I need to track down where the mesh modules are actually registered—the WasmInittab files are generated, so I'm looking for the source registration logic in MainGui.cpp and how it gets created.

Fable

⚙ Bash

{"command": "grep -n \"Inittab\\|PyImport_AppendInittab\\|freecadWasmRegisterInittab\\|Mesh\\|Part\\|Sketcher\\|WasmInittab\" src/Main/MainGui.cpp | head -40", "description": "Grep inittab in MainGui"}

tool result

154:// Generated WasmInittabGui.cpp: registers statically linked Python extension
156:void freecadWasmRegisterInittab();
199:    freecadWasmRegisterInittab();
278:    App::Application::Config()["StartWorkbench"] = "PartDesignWorkbench";

Fable

⚙ Bash

{"command": "grep -n \"Inittab\\|WasmInittab\\|GenerateInittab\\|generate.*inittab\\|WASM\" src/Main/CMakeLists.txt | head -30", "description": "Grep inittab generation in CMake"}

tool result

11:    set(FREECAD_WASM_PY_MODULES "")
12:    set(FREECAD_WASM_PY_GUI_MODULES "")
14:        list(APPEND FREECAD_WASM_PY_MODULES Part)
15:        list(APPEND FREECAD_WASM_PY_GUI_MODULES PartGui)
18:        list(APPEND FREECAD_WASM_PY_MODULES Sketcher)
19:        list(APPEND FREECAD_WASM_PY_GUI_MODULES SketcherGui)
22:        list(APPEND FREECAD_WASM_PY_MODULES PartDesign)
23:        list(APPEND FREECAD_WASM_PY_GUI_MODULES PartDesignGui)
26:        list(APPEND FREECAD_WASM_PY_MODULES Spreadsheet)  …[truncated]

Fable

⚙ Bash {"command": "sed -n '1,75p' src/Main/CMakeLists.txt", "description": "Read Main CMakeLists wasm inittab section"}

tool result

# SPDX-License-Identifier: LGPL-2.1-or-later

configure_file(freecad.rc.cmake ${CMAKE_CURRENT_BINARY_DIR}/freecad.rc)
configure_file(freecadCmd.rc.cmake ${CMAKE_CURRENT_BINARY_DIR}/freecadCmd.rc)
file(COPY icon.ico DESTINATION ${CMAKE_CURRENT_BINARY_DIR})


if(EMSCRIPTEN)
    # Python extension modules are linked statically into the executables and
    # must be registered on the interpreter's inittab before Py_Initialize().
    set(FREECAD_WASM_PY_MODULES "")
    set(FREECAD_WASM_PY_GUI_MODULES  …[truncated]

Fable

thinking

I'm working through the inittab generation and need to add BUILD_MESH and BUILD_MESH_PART blocks. The Python modules register with specific names—Mesh and MeshGui for the Mesh module, MeshPart and MeshPartGui for MeshPart—and I need to verify the module init function names by checking how the App initializes them.

Fable

⚙ Bash

{"command": "grep -rn \"PyMODINIT_FUNC\\|PyInit_\\|initMesh\\|SET_PYTHON_PREFIX\" src/Mod/Mesh/App/AppMesh.cpp src/Mod/Mesh/Gui/AppMeshGui.cpp src/Mod/MeshPart/App/AppMeshPart.cpp src/Mod/MeshPart/Gui/AppMeshPartGui.cpp 2>/dev/null | head",…

tool result

(Bash completed with no output)

Fable

⚙ Bash

{"command": "echo \"===Init.py/InitGui.py mesh formats===\"; grep -n \"addImportType\\|addExportType\\|FileIcon\\|addObject\" src/Mod/Mesh/Init.py | head -30", "description": "Check Mesh Init.py import/export"}

tool result

===Init.py/InitGui.py mesh formats===
11:FreeCAD.addImportType("STL Mesh (*.stl *.STL *.ast *.AST)", "Mesh")
12:FreeCAD.addImportType("Binary Mesh (*.bms *.BMS)", "Mesh")
13:FreeCAD.addImportType("Alias Mesh (*.obj *.OBJ)", "Mesh")
14:FreeCAD.addImportType("Object File Format Mesh (*.off *.OFF)", "Mesh")
15:FreeCAD.addImportType("Stanford Triangle Mesh (*.ply *.PLY)", "Mesh")
16:FreeCAD.addImportType("Simple Model Format (*.smf *.SMF)", "Mesh")
17:FreeCAD.addImportType("3D Manufacturing Format (  …[truncated]

Fable

thinking

I need to look at how the module initialization functions are named in AppMesh.cpp, probably using the `PyMOD_INIT_FUNC` macro with "Mesh" as the argument.

Fable

⚙ Bash

{"command": "grep -rn \"PyMOD_INIT_FUNC\\|PyInit\\|MOD_INIT\" src/Mod/Mesh/App/AppMesh.cpp src/Mod/MeshPart/App/AppMeshPart.cpp src/Mod/Mesh/Gui/AppMeshGui.cpp src/Mod/MeshPart/Gui/AppMeshPartGui.cpp; echo \"===check macro def===\"; grep -r…

tool result

src/Mod/MeshPart/App/AppMeshPart.cpp:37:PyMOD_INIT_FUNC(MeshPart)
src/Mod/Mesh/Gui/AppMeshGui.cpp:121:PyMOD_INIT_FUNC(MeshGui)
src/Mod/Mesh/App/AppMesh.cpp:55:PyMOD_INIT_FUNC(Mesh)
src/Mod/MeshPart/Gui/AppMeshPartGui.cpp:70:PyMOD_INIT_FUNC(MeshPartGui)
===check macro def===
src/Base/PyObjectBase.h:67:#define PyMOD_INIT_FUNC(name) PyMODINIT_FUNC PyInit_##name(void)

Fable

⚙ Bash

{"command": "echo \"===MeshIO threading/mmap===\"; grep -n \"thread\\|async\\|mmap\\|QtConcurrent\\|fopen\\|ifstream\" src/Mod/Mesh/App/Core/MeshIO.cpp | head; echo \"===Approximation/Segmentation thread===\"; grep -rln \"std::thread\\|std:…

tool result

===MeshIO threading/mmap===
133:    Base::ifstream& getStream()
140:    Base::ifstream str;
234:    Base::ifstream str(fi, std::ios::in | std::ios::binary);
403:            Base::ifstream mtl(fi, std::ios::in | std::ios::binary);
1253:bool MeshInput::LoadCadmouldFE(std::ifstream& input)
===Approximation/Segmentation thread===
src/Mod/Mesh/App/CMakeLists.txt
src/Mod/Mesh/App/Core/Curvature.cpp
src/Mod/Mesh/App/Core/Functional.h
src/Mod/Mesh/App/Core/Evaluation.cpp
src/Mod/Mesh/App/Core/Build  …[truncated]

Fable

thinking

I've confirmed the Python initialization function names for the four modules. Looking at threading usage across the codebase, the only places with concurrency are Curvature.cpp using QtConcurrent, and Functional.h with std::async which gets called from Builder.cpp and Evaluation.cpp—those two also use hardware_concurrency and parallel_sort. MeshIO doesn't involve any threading. Now examining the MeshPart and Gui components...

CrossSections.cpp has a QtConcurrent::mapped call, which is a GUI threading hazard. I should also scan the Gui dialogs for modal exec() calls on QDialog and QMessageBox, plus check for any QThread usage in both Mesh Gui and MeshPart Gui. RemeshGmsh is another concern s  …

Fable

⚙ Bash

{"command": "echo \"===Mesh Gui exec() modal===\"; grep -rn \"\\.exec()\\|->exec()\\|QProcess\\|QThread\\|std::thread\\|std::async\\|system(\" src/Mod/Mesh/Gui/*.cpp | grep -v \"processEvents\" | head -40", "description": "Grep modal/proces…

Fable

⚙ Bash

{"command": "echo \"===MeshPart Gui exec/thread/process===\"; grep -rn \"\\.exec()\\|->exec()\\|QProcess\\|QThread\\|std::thread\\|std::async\\|QtConcurrent\" src/Mod/MeshPart/Gui/*.cpp | head -30; echo \"===RemeshGmsh gmsh===\"; grep -rn \…

tool result

===Mesh Gui exec() modal===
src/Mod/Mesh/Gui/DlgEvaluateMeshImp.cpp:1315:        if (dlg.exec() == QDialog::Accepted) {
src/Mod/Mesh/Gui/RemeshGmsh.cpp:72:    QProcess gmsh;
src/Mod/Mesh/Gui/RemeshGmsh.cpp:118:    connect(&d->gmsh, &QProcess::started, this, &GmshWidget::started);
src/Mod/Mesh/Gui/RemeshGmsh.cpp:119:    connect(&d->gmsh, qOverload<int, QProcess::ExitStatus>(&QProcess::finished),
src/Mod/Mesh/Gui/RemeshGmsh.cpp:121:    connect(&d->gmsh, &QProcess::errorOccurred,
src/Mod/Mesh/Gui/R  …[truncated]

tool result

===MeshPart Gui exec/thread/process===
src/Mod/MeshPart/Gui/Command.cpp:115:    msgBox.exec();
src/Mod/MeshPart/Gui/CrossSections.cpp:36:#include <QtConcurrentMap>
src/Mod/MeshPart/Gui/CrossSections.cpp:314:            = QtConcurrent::mapped(d, std::bind(&MeshCrossSection::section, &cs, sp::_1));
===RemeshGmsh gmsh===
src/Mod/Mesh/Gui/RemeshGmsh.cpp:40:#include "RemeshGmsh.h"
src/Mod/Mesh/Gui/RemeshGmsh.cpp:41:#include "ui_RemeshGmsh.h"
src/Mod/Mesh/Gui/RemeshGmsh.cpp:46:class GmshWidget::Priva  …[truncated]

Fable

thinking

I'm identifying the compatibility issues for WASM. The main problem is in the Remesh with GMSH feature, which spawns an external gmsh binary via QProcess—that won't work in a browser environment since there's no subprocess support. The widget itself won't crash, but I need to guard the command to prevent it from being invoked. There are also other GUI hazards in the Mesh/Gui/Dlg section I'm still reviewing.

Beyond that, I'm seeing modal dialogs in EvaluateMeshImp.cpp and MeshPart/Gui/Command.cpp that could hang under asyncify, plus QtConcurrent::mapped in CrossSections.cpp which relies on threading. In single-threaded WASM, QtConcurrent doesn't have a proper fallback—I'll need to replace it  …

Fable

⚙ Bash

{"command": "grep -rn \"ComputePerFace\\|ComputePerVertex\\|MeshCurvature\" src/Mod/Mesh/App/ src/Mod/Mesh/Gui/ | grep -iv \"\\.h:\" | head", "description": "Find ComputePerFace callers"}

tool result

src/Mod/Mesh/App/AppMesh.cpp:34:#include "FeatureMeshCurvature.h"
src/Mod/Mesh/App/FeatureMeshCurvature.cpp:28:#include "FeatureMeshCurvature.h"
src/Mod/Mesh/App/FeatureMeshCurvature.cpp:63:    MeshCore::MeshCurvature meshCurv(rMesh);
src/Mod/Mesh/App/FeatureMeshCurvature.cpp:64:    meshCurv.ComputePerVertex();
src/Mod/Mesh/App/CMakeLists.txt:247:    WildMagic4/Wm4MeshCurvature.cpp
src/Mod/Mesh/App/CMakeLists.txt:248:    WildMagic4/Wm4MeshCurvature.h
src/Mod/Mesh/App/CMakeLists.txt:357:    F  …[truncated]

Fable

⚙ Bash

{"command": "echo \"===BUILD_MESH cache line context===\"; grep -n \"BUILD_MESH\\b\\|BUILD_MESH_PART\\|BUILD_POINTS\\|BUILD_FEM\\b\" cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake", "description": "Find BUILD_MESH option defs"}

tool result

===BUILD_MESH cache line context===
147:    option(BUILD_FEM "Build the FreeCAD FEM module" ON)
158:    option(BUILD_MESH "Build the FreeCAD mesh module" ON)
159:    option(BUILD_MESH_PART "Build the FreeCAD mesh part module" ON)
167:    option(BUILD_POINTS "Build the FreeCAD points module" ON)
218:    if(BUILD_FEM OR BUILD_MESH_PART)

Fable

thinking

I'm searching through the Gui code to find where ComputePerFace is called with parallel=true.

Fable

⚙ Bash

{"command": "grep -rn \"ComputePerFace\\|Curvature.*true\\|CurvatureInfo\" src/Mod/Mesh/Gui/*.cpp | head; echo \"===check ADD subdir gating in Mod CMake===\"; grep -n \"BUILD_MESH\\|BUILD_MESH_PART\\|BUILD_POINTS\\|Mesh\\|add_subdirectory\"…

tool result

src/Mod/Mesh/Gui/Command.cpp:632:DEF_STD_CMD_A(CmdMeshVertexCurvatureInfo)
src/Mod/Mesh/Gui/Command.cpp:634:CmdMeshVertexCurvatureInfo::CmdMeshVertexCurvatureInfo()
src/Mod/Mesh/Gui/Command.cpp:635:    : Command("Mesh_CurvatureInfo")
src/Mod/Mesh/Gui/Command.cpp:641:    sWhatsThis = "Mesh_CurvatureInfo";
src/Mod/Mesh/Gui/Command.cpp:643:    sPixmap = "Mesh_CurvatureInfo";
src/Mod/Mesh/Gui/Command.cpp:646:void CmdMeshVertexCurvatureInfo::activated(int)
src/Mod/Mesh/Gui/Command.cpp:665:bool   …[truncated]

Fable

thinking

Looking at the FeatureMeshCurvature implementation, it only calls ComputePerVertex, which doesn't use parallel processing. The QtConcurrent parallelization is only available in ComputePerFace, so the Property computation path doesn't benefit from it.

Fable

⚙ Bash

{"command": "grep -n \"ComputePerVertex\\|QtConcurrent\\|parallel\\|QFuture\" src/Mod/Mesh/App/Core/Curvature.cpp | head; echo \"===MeshPart Init.py deps===\"; cat src/Mod/MeshPart/Init.py 2>/dev/null | grep -n \"import\\|addImport\\|addExp…

tool result

29:#include <QFuture>
30:#include <QFutureWatcher>
31:#include <QtConcurrentMap>
69:void MeshCurvature::ComputePerFace(bool parallel)
75:    if (!parallel) {
85:        QFuture<CurvatureInfo> future
86:            = QtConcurrent::mapped(mySegment, std::bind(&FacetCurvature::Compute, &face, sp::_1));
88:        QFutureWatcher<CurvatureInfo> watcher;
127:void MeshCurvature::ComputePerVertex()
292:void MeshCurvature::ComputePerVertex()
===MeshPart Init.py deps===

Fable

thinking

I'm checking whether ComputePerVertex uses QtConcurrent—it doesn't, so the app-level curvature computation is safe. The parallel path only exists in ComputePerFace, which Segmentation might call. Let me do a final search to confirm the full picture.

I have enough information now to write the plan and patches. The fix for Curvature is straightforward: force parallel=false on WebAssembly regardless of settings.

Looking at the architecture, I can see three dependency tiers emerging. The Mesh module itself (both App and Gui layers) has no external dependencies beyond what's already built—FreeCADBase, FreeCADApp, Coin3D, Qt—and only needs threading fixes. It provides the core mesh functionality  …

Fable

⚙ Bash {"command": "sed -n '425,470p' src/Mod/MeshPart/App/Mesher.cpp", "description": "Check createFrom definition guarding"}

tool result

    }

    return meshdata;
#endif  // HAVE_SMESH
}

Mesh::MeshObject* Mesher::createFrom(SMESH_Mesh* mesh) const
{
    // build up the mesh structure
    SMDS_FaceIteratorPtr aFaceIter = mesh->GetMeshDS()->facesIterator();
    SMDS_NodeIteratorPtr aNodeIter = mesh->GetMeshDS()->nodesIterator();

    MeshCore::MeshPointArray verts;
    MeshCore::MeshFacetArray faces;
    verts.reserve(mesh->NbNodes());
    faces.reserve(mesh->NbFaces());

    int index = 0;
    std::map<const S  …[truncated]

Fable

⚙ Bash

{"command": "echo \"===AppMeshPartPy uses SMESH unguarded?===\"; grep -n \"SMESH\\|Mefisto\\|Netgen\\|Mesher\\|createFrom\" src/Mod/MeshPart/App/AppMeshPartPy.cpp | head; echo \"===MeshAlgos SMESH?===\"; grep -n \"SMESH\\|HAVE_SMESH\\|vtk\\…

tool result

===AppMeshPartPy uses SMESH unguarded?===
45:#include "Mesher.h"
460:        auto runMesher = [](const MeshPart::Mesher& mesher) {
481:            MeshPart::Mesher mesher(static_cast<Part::TopoShapePy*>(shape)->getTopoShapePtr()->getShape());
482:            mesher.setMethod(MeshPart::Mesher::Standard);
504:            return runMesher(mesher);
512:            MeshPart::Mesher mesher(static_cast<Part::TopoShapePy*>(shape)->getTopoShapePtr()->getShape());
513:            mesher.setMethod(Me  …[truncated]

Fable

thinking

I've spotted a critical compilation issue: the `createFrom` function that takes a SMESH_Mesh pointer is defined outside the SMESH guard block, so it tries to use SMESH types and methods that won't be available when SMESH isn't included. The function body references incomplete types and SMDS iterators that only exist within the `#ifdef HAVE_SMESH` section.

I need to wrap the entire `createFrom` function definition under the SMESH preprocessor guard to prevent compilation errors when SMESH support is disabled. Let me locate where this function ends so I can properly enclose it.

Fable

⚙ Bash

{"command": "awk 'NR>=431 && NR<=520 {print NR\": \"$0}' src/Mod/MeshPart/App/Mesher.cpp | grep -n \"^\" | sed -n '1,90p' | grep -E \"createFrom|^[0-9]+:[0-9]+: \\}|return meshdata|^[0-9]+:5[0-9][0-9]:\" ; echo \"---end detection---\"; awk …

tool result

1:431: Mesh::MeshObject* Mesher::createFrom(SMESH_Mesh* mesh) const
70:500: 
71:501:             f4._aulPoints[0] = mapNodeIndex[node3];
72:502:             f4._aulPoints[1] = mapNodeIndex[node4];
73:503:             f4._aulPoints[2] = mapNodeIndex[node5];
74:504: 
75:505:             faces.push_back(f1);
76:506:             faces.push_back(f2);
77:507:             faces.push_back(f3);
78:508:             faces.push_back(f4);
79:509:         }
80:510:         else if (aFace->NbNodes()  …[truncated]

Fable

thinking

The `createFrom` function spanning lines 431-582 needs to be wrapped in preprocessor guards, and I should do the same for its declaration in Mesher.h at line 219 to keep things consistent, even though leaving it unguarded wouldn't cause issues since it's never invoked without SMESH support.

AppMeshPartPy.cpp uses the `Mesher::Mefisto` enum (which exists unconditionally) and calls `setMethod(Mefisto)` followed by `createMesh()`, which throws a RuntimeError when SMESH isn't available — so the Python interface handles the missing dependency gracefully at runtime. The file doesn't reference `createFrom` directly, which is good. Now I need to scan the other source files in MeshPart/App like Mesh  …

Fable

⚙ Bash

{"command": "echo \"===App SMESH refs unguarded===\"; grep -rn \"SMESH\\|SMDS\\|StdMeshers\\|NETGEN\" src/Mod/MeshPart/App/*.cpp | grep -v \"HAVE_SMESH\\|HAVE_NETGEN\"; echo \"===Gui SMESH refs===\"; grep -rn \"SMESH\\|SMDS\\|HAVE_SMESH\\|M…

tool result

===App SMESH refs unguarded===
src/Mod/MeshPart/App/AppMeshPartPy.cpp:584:            throw Py::RuntimeError("SMESH was built without NETGEN support");
src/Mod/MeshPart/App/AppMeshPartPy.cpp:609:            throw Py::RuntimeError("SMESH was built without NETGEN support");
src/Mod/MeshPart/App/Mesher.cpp:50:# include <SMESHDS_Mesh.hxx>
src/Mod/MeshPart/App/Mesher.cpp:51:# include <SMESH_Gen.hxx>
src/Mod/MeshPart/App/Mesher.cpp:52:# include <SMESH_Mesh.hxx>
src/Mod/MeshPart/App/Mesher.cpp:53:  …[truncated]

Fable

thinking

I've identified the main compilation issue: the `createFrom` function in App needs to be wrapped with a preprocessor guard, along with its declaration in Mesher.h. The Tessellation.cpp file references Mefisto and Netgen enums that exist unconditionally, but the GUI handles this by disabling those tabs, leaving the Standard tab available—so the GUI compiles fine. There's already a tab disable at line 85 in Tessellation.cpp for the Mefisto tab.

I've checked AppMeshPartPy.cpp and confirmed the NETGEN-specific functions that throw error messages don't reference any unguarded SMESH types. Now I'm ready to write out the complete plan and patch file with the exact edits needed: gating the FEM/MESH  …

Fable

⚙ Bash

{"command": "sed -n '300,340p' src/Mod/MeshPart/Gui/CrossSections.cpp", "description": "Read CrossSections QtConcurrent context"}

Fable

⚙ Bash

{"command": "sed -n '215,225p' src/Mod/MeshPart/App/Mesher.h", "description": "Read Mesher.h createFrom declaration context"}

tool result

    double eps = ui->spinEpsilon->value();

#if 1  // multi-threaded sections
    for (auto it : obj) {
        const Mesh::MeshObject& mesh = static_cast<Mesh::Feature*>(it)->Mesh.getValue();

        MeshCore::MeshKernel kernel(mesh.getKernel());
        kernel.Transform(mesh.getTransform());

        MeshCore::MeshFacetGrid grid(kernel);

        // NOLINTBEGIN
        MeshCrossSection cs(kernel, grid, a, b, c, connectEdges, eps);
        QFuture<std::list<TopoDS_Wire>> future
            = Q  …[truncated]

tool result

    Mesh::MeshObject* createMesh() const;

private:
    Mesh::MeshObject* createStandard() const;
    Mesh::MeshObject* createFrom(SMESH_Mesh*) const;

private:
    const TopoDS_Shape& shape;
    Method method {None};
    double maxLength {0};
    double maxArea {0};

Fable

thinking

I see that CrossSections already has a Python fallback in the `#else` branch, but the `#if 1` directive keeps the current code path active. For WebAssembly compatibility, I can replace the QtConcurrent::mapped call with a straightforward serial loop using std::transform instead. Now I'm ready to write out the comprehensive plan.

Before I finalize it, I should verify what the CMakeCache currently has disabled (BUILD_MESH and related flags) and check the exact configure command and toolchain file being used so I can provide the precise -D flags needed.

Fable

⚙ Bash

{"command": "grep -iE \"CMAKE_TOOLCHAIN|EMSCRIPTEN|CMAKE_COMMAND|BUILD_GUI|BUILD_PART:|BUILD_SKETCHER|CMAKE_PROJECT\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt | head; echo \"---generator---\"; grep -iE \"CMAKE_GENERATOR:|CMAKE_M…

tool result

BUILD_GUI:BOOL=ON
BUILD_PART:BOOL=ON
BUILD_SKETCHER:BOOL=ON
CMAKE_PROJECT_COMPAT_VERSION:STATIC=
CMAKE_PROJECT_DESCRIPTION:STATIC=
CMAKE_PROJECT_HOMEPAGE_URL:STATIC=
CMAKE_PROJECT_NAME:STATIC=FreeCAD
CMAKE_PROJECT_SPDX_LICENSE:STATIC=
CMAKE_PROJECT_VERSION:STATIC=2.0.1
CMAKE_PROJECT_VERSION_MAJOR:STATIC=2
---generator---
CMAKE_MAKE_PROGRAM:FILEPATH=/usr/bin/ninja
CMAKE_GENERATOR:INTERNAL=Ninja
//ADVANCED property for variable: CMAKE_MAKE_PROGRAM
CMAKE_MAKE_PROGRAM-ADVANCED:INTERNAL=1

Fable

⚙ Bash

{"command": "grep -iE \"CMAKE_TOOLCHAIN_FILE|EMSCRIPTEN|emcmake|emsdk\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt | head; echo \"---mesh/qtconcurrent lib available?---\"; grep -iE \"QtConcurrent|Qt6Concurrent\" /opt/toolchains/sr…

tool result

CMAKE_CROSSCOMPILING_EMULATOR:UNINITIALIZED=/opt/toolchains/emsdk/node/22.16.0_64bit/bin/node
CMAKE_TOOLCHAIN_FILE:FILEPATH=/opt/toolchains/emsdk/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake
EGL_INCLUDE_DIR:PATH=/opt/toolchains/emsdk/upstream/emscripten/cache/sysroot/include
EMSCRIPTEN_FORCE_COMPILERS:BOOL=ON
EMSCRIPTEN_GENERATE_BITCODE_STATIC_LIBRARIES:BOOL=OFF
FREECAD_WASM_EXTRA_LINK_LIBS:STRING=/opt/toolchains/python-wasm/lib/libmpdec.a;/opt/toolchains/python-wasm/lib/libffi.a;  …[truncated]

Fable

thinking

I'm realizing that Qt6Concurrent is available in the wasm single-thread build, but there's a fundamental issue: QtConcurrent relies on QThreadPool, which doesn't function properly in Qt's single-threaded wasm environment since QThread itself isn't operational. Even though QtConcurrent::mapped would attempt to use the global thread pool, it won't actually execute tasks in parallel on a no-thread build.

Given the project's history with threading causing hangs, I'm going to treat QtConcurrent::mapped and waitForFinished as unsafe and provide a serial replacement instead. That's the most reliable approach.

Now I'll write out the plan document with all the details.

Fable

I have enough grounding. Let me write the plan and patch files.

Fable

⚙ Write

{"file_path": "/home/magik6k/lcad-wasm/porting/mesh/plan.md", "content": "# FreeCAD → WebAssembly: Mesh / MeshPart port plan\n\nScope: `src/Mod/Mesh` and `src/Mod/MeshPart` (+ the SMESH/netgen dependency question).\nToolchain: emscripten + …

tool result

File created successfully at: /home/magik6k/lcad-wasm/porting/mesh/plan.md (file state is current in your context — no need to Read it back)

Fable

Now the patch files. Let me create them with real context.

Fable

⚙ Bash

{"command": "mkdir -p /home/magik6k/lcad-wasm/porting/mesh/patches && sed -n '431,433p;580,582p' src/Mod/MeshPart/App/Mesher.cpp | cat -n", "description": "Confirm createFrom boundaries"}

tool result

     1	Mesh::MeshObject* Mesher::createFrom(SMESH_Mesh* mesh) const
     2	{
     3	    // build up the mesh structure
     4	    meshdata->swap(kernel);
     5	    return meshdata;
     6	}

Fable

⚙ Write

{"file_path": "/home/magik6k/lcad-wasm/porting/mesh/patches/01-cmake-smesh-decouple.diff", "content": "--- a/cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake\n+++ b/cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake\n@@ -215…

tool result

File created successfully at: /home/magik6k/lcad-wasm/porting/mesh/patches/01-cmake-smesh-decouple.diff (file state is current in your context — no need to Read it back)

Fable

⚙ Write

{"file_path": "/home/magik6k/lcad-wasm/porting/mesh/patches/02-main-inittab.diff", "content": "--- a/src/Main/CMakeLists.txt\n+++ b/src/Main/CMakeLists.txt\n@@ -32,6 +32,14 @@\n     if(BUILD_MEASURE)\n         list(APPEND FREECAD_WASM_PY_MO…

tool result

File created successfully at: /home/magik6k/lcad-wasm/porting/mesh/patches/02-main-inittab.diff (file state is current in your context — no need to Read it back)

Fable

⚙ Write

{"file_path": "/home/magik6k/lcad-wasm/porting/mesh/patches/03-mesher-createfrom-guard.diff", "content": "--- a/src/Mod/MeshPart/App/Mesher.cpp\n+++ b/src/Mod/MeshPart/App/Mesher.cpp\n@@ -428,6 +428,7 @@\n #endif  // HAVE_SMESH\n }\n\n+#ifd…

tool result

File created successfully at: /home/magik6k/lcad-wasm/porting/mesh/patches/03-mesher-createfrom-guard.diff (file state is current in your context — no need to Read it back)

Fable

⚙ Write

{"file_path": "/home/magik6k/lcad-wasm/porting/mesh/patches/04-functional-emscripten.diff", "content": "--- a/src/Mod/Mesh/App/Core/Functional.h\n+++ b/src/Mod/Mesh/App/Core/Functional.h\n@@ -31,6 +31,12 @@\n template<class Iter, class Pred…

tool result

File created successfully at: /home/magik6k/lcad-wasm/porting/mesh/patches/04-functional-emscripten.diff (file state is current in your context — no need to Read it back)

Fable

⚙ Write

{"file_path": "/home/magik6k/lcad-wasm/porting/mesh/patches/05-curvature-serial.diff", "content": "--- a/src/Mod/Mesh/App/Core/Curvature.cpp\n+++ b/src/Mod/Mesh/App/Core/Curvature.cpp\n@@ -69,6 +69,10 @@\n void MeshCurvature::ComputePerFace…

tool result

File created successfully at: /home/magik6k/lcad-wasm/porting/mesh/patches/05-curvature-serial.diff (file state is current in your context — no need to Read it back)

Fable

⚙ Write

{"file_path": "/home/magik6k/lcad-wasm/porting/mesh/patches/06-crosssections-serial.diff", "content": "--- a/src/Mod/MeshPart/Gui/CrossSections.cpp\n+++ b/src/Mod/MeshPart/Gui/CrossSections.cpp\n@@ -310,10 +310,17 @@\n\n         // NOLINTBE…

tool result

File created successfully at: /home/magik6k/lcad-wasm/porting/mesh/patches/06-crosssections-serial.diff (file state is current in your context — no need to Read it back)

Fable

thinking

I need to verify that the `d` member of CrossSections is indeed a vector of doubles so the iteration syntax works correctly.

Fable

⚙ Bash

{"command": "grep -n \"QList<double>\\| d;\\|std::vector<double> d\\|d =\\|d\\.push\\|QVector<double>\\|d(\" src/Mod/MeshPart/Gui/CrossSections.cpp | head; echo \"---decl of d---\"; sed -n '280,300p' src/Mod/MeshPart/Gui/CrossSections.cpp",…

tool result

80:        this->pcRoot->addChild(color);
81:        this->pcRoot->addChild(style);
82:        this->pcRoot->addChild(coords);
83:        this->pcRoot->addChild(planes);
136:        , grid(grid)
155:                mkPoly.Add(Base::convertTo<gp_Pnt>(jt));
239:    if (ui->xyPlane->isChecked()) {
242:    else if (ui->xzPlane->isChecked()) {
276:        Mesh::Feature::getClassTypeId()
279:    std::vector<double> d;
---decl of d---
    if (ui->sectionsBox->isChecked()) {
        d = getPlanes();
     …[truncated]

Fable

thinking

The vector iteration and async list return look correct. The patches are all valid, and since the documentation already references them, I'm ready to output the structured result. Now I need to figure out where Mesh fits in the module dependency order relative to FreeCAD.

Since MeshPart depends on Part and Mesh, and Part is already built early, I can assign Mesh a buildOrder of 4 to keep it after the kernel and Part. Let me fill in the structured fields: slug as "mesh", title describing the OCCT tessellation approach with excluded dependencies, feasibility marked as needs-code since both Tier A and B require code and CMake changes, effort estimated at 1-2 days, the deliverable pointing to t  …

Fable

All patches verified against real types (`d` is `std::vector<double>`, `cs.section` returns `std::list<TopoDS_Wire>`). Everything is grounded in the tree. Writing the structured summary.

Fable

⚙ StructuredOutput

{"input": "{\"slug\":\"mesh\",\"title\":\"Mesh / MeshPart (OCCT tessellation; SMESH & netgen excluded)\",\"feasibility\":\"needs-code\",\"oneLineVerdict\":\"Mesh (App+Gui) is essentially config-only and MeshPart works via the OCCT BRepMesh …

tool result

Output does not match required schema: root: must have required property 'slug', root: must have required property 'title', root: must have required property 'feasibility', root: must have required property 'oneLineVerdict', root: must have required property 'effort', root: must have required property 'buildOrder', root: must have required property 'deliverableFile', root: must NOT have additional properties

Fable

thinking

I need to restructure the schema to place the fields at the root level instead of nesting them under an "input" wrapper.

Fable

⚙ StructuredOutput

{"slug": "mesh", "title": "Mesh / MeshPart (OCCT tessellation; SMESH & netgen excluded)", "feasibility": "needs-code", "oneLineVerdict": "Mesh (App+Gui) is essentially config-only and MeshPart works via the OCCT BRepMesh 'Standard' mesher a…

tool result

Structured output provided successfully