Having never ‘dabbled’ with caustics before, and now trying to go in at the deep end by having an animation with caustics *going through* a revolving door, I just wondered if the ‘caustics bit’ of the solution is saved with the irmap as normal.
It depends on whether you are using GI caustics, or photon-mapped caustics (from the Caustics rollout in VRay). In first case - yes, they are saved with the irradiance map. In the second case - no, but there is an option to save the caustics file separately.
Best regards,
Vlado