Caustics in a room problem

[Jiri.Matys]

I compute caustics in a room from sun. Everyrhing ok, but then I make a windows with glass and caustics apperantly didnt go through the glass. I disable generate and receive caustics in the glass objects, but still room is very dark because light didnt pass to the room. When I hide the glass objects its ok even with caustics. What I have to do to compute caustics properly without hiding glass objects?

[super gnu]

hmm off the top of my head.. turn off send / recieve gi, visible to gi in the vray properties and cast shadows and recieve shadows in the object properties


that should do it..

[simmsimaging]

Do you have 'affect shadows' turned off in the glass material? If I remember it right, that has to be off with caustics, but if you have the glass set to not affect caustics I think you would want to have that turned on avoid having it darken the room.

[chris-x//]

I got the same problem, when glass is on, and caustics on, the scene is darkened, couldn't find any solution yet and deadline is coming, did you find any solution to that problem ?
Thanks,
chris

[simmsimaging]

Turning on 'affect shadows' in the glass material should brighten the room if you are not using caustics through the glass. If you are using caustics then it might be a case of getting more photons into the room in order to get enough brightness, and that could be a problem that may be solved with additional lights that just contribute caustics.

Just turn on affect shadows for the glass either way and you should be okay as it should kill the caustics anyway and I would not really expect caustics from window glass most of the time in any case.

If that doesn't work then not sure what is going on.

[chris-x//]

Thanls for the answer. Affect shadows for the glass is on. There is just one light inside the room generating caustics. Other lights do not generate any caustics. If I turn caustics on in the indirect illumination rollout, it looks like the sun doesn't go through the glass anymore, even if it's not concerned by the caustics. Hiding the glass solves everything. As if when activating caustics, the glass would act as solid, non refractive wall. I'll try to post a picture, but I am not allowed to show my project. Sent it to vlado but didn't get any answer. Aaah deadlines and problems... Thanks anyway !

[ChaosGroup]

It works fine here.
In the attached image: left side I have glass, on the right side I don't.
Can you attach a simple example scene or send it to: vray_at_chaosgroup.com