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Fix PyTorch backend module loading #219

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Fix PyTorch backend module loading #219

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15 changes: 14 additions & 1 deletion src/owPhysicsFluidSimulator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -95,11 +95,17 @@ owPhysicsFluidSimulator::owPhysicsFluidSimulator(owHelper *helper, int argc,
useTorchBackend = config->torchEnabled();
if (useTorchBackend) {
Py_Initialize();
// Ensure the repository root is on the Python path so the solver
// module can be located when running the compiled binary from any
// directory.
PyRun_SimpleString("import sys, os; sys.path.append(os.getcwd())");
PyObject *pName = PyUnicode_FromString("pytorch_solver");
PyObject *pModule = PyImport_Import(pName);
Py_DECREF(pName);
if (!pModule)
if (!pModule) {
PyErr_Print();
throw std::runtime_error("Failed to load pytorch_solver module");
}
PyObject *pClass = PyObject_GetAttrString(pModule, "PytorchSolver");
Py_DECREF(pModule);
if (!pClass)
Expand Down Expand Up @@ -238,9 +244,16 @@ void owPhysicsFluidSimulator::reset() {
if (torchSolver) {
Py_DECREF(torchSolver);
}
// Ensure the solver module can be resolved even if the working
// directory changes between runs.
PyRun_SimpleString("import sys, os; sys.path.append(os.getcwd())");
PyObject *pName = PyUnicode_FromString("pytorch_solver");
PyObject *pModule = PyImport_Import(pName);
Py_DECREF(pName);
if (!pModule) {
PyErr_Print();
throw std::runtime_error("Failed to load pytorch_solver module");
}
PyObject *pClass = PyObject_GetAttrString(pModule, "PytorchSolver");
Py_DECREF(pModule);
int count = config->getParticleCount();
Expand Down
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