Issue 189: always compile lambert to avoid compile error
Workaround for #189 (closed) . It is not a satisfying fix as it implies that we always compile the lambertian kernel even if there is no lambertian in the scene.
Workaround for #189 (closed) . It is not a satisfying fix as it implies that we always compile the lambertian kernel even if there is no lambertian in the scene.