Integrator "ambientocclusion"

[wahn]

By replacing the directlighting integrator (using default values) within the Cornell Box scene we get:

On the C++ side this is handled in RenderOptions::MakeIntegrator():

Integrator *RenderOptions::MakeIntegrator() const {
...
    if (IntegratorName == "whitted")
        integrator = CreateWhittedIntegrator(IntegratorParams, sampler, camera);
...
    else if (IntegratorName == "directlighting")
        integrator =
            CreateDirectLightingIntegrator(IntegratorParams, sampler, camera);
...
    } else if (IntegratorName == "ambientocclusion") {
        integrator = CreateAOIntegrator(IntegratorParams, sampler, camera);
...
    }
...
}

[wahn]

Commit e0ef343 should render exactly the same image as the C++ counterpart:

Closing the issue for now ...