Default Integrator

[wahn]

What happens (in the C++ version of pbrt) when the Integrator line is missing in the scene file?

We need to match that behaviour in the Rust version ...

[wahn]

I think in C++ the default Integrator name is path:

struct RenderOptions {
...
    std::string IntegratorName = "path";
...
};

[wahn]

Commit 2098519 should resolve the issue.