Caustic anti-aliasing problem

[simmsimaging]

I'm working on lighting/materials for an upcoming job and I'm getting some weird aliasing problems whenever I turn on photon mapped caustics, at least in this file. See the images below - you can see an aliased white keyline around my objects, particularly obvious in the one where I turned on the Vray depth of field and it became a huge halo.

This goes away as soon as I turn off the photon mapped caustics so it appears to be strictly related to that function. It's an odd one IMO because it shows up all the way around the objects, even where they are in contact with the ground (you can see it in the overall image of the caustic pass below). Only two Vray lights are set to produce caustics, and only the 3 letter objects will generate them (the ground/wall are set to receive only).

This came up while testing so I brought the caustic multiplier way down and I raised the search distance quite a bit from where it was, and I'm pretty sure that I got rid of this in my last render test, but it popped up again when I ran the set of hi-res.

Any ideas what might cause this kind of artifact? It's totally ruined all the passes and I need to be rendering this job in the coming week. I can do it without caustics but it loses a lot of nice kick without those glints/reflections in there.

b







Thanks in advance for any help.
b

[simmsimaging]

So I managed to get rid of it again by merging all the stuff into a new scene and deleting any and all of the caustic maps on hand (it was set to create new, but maybe it wasn't for some reason). I would still like to figure out what might have caused it though so I can deal with it again if it comes back.


Thanks,
b

[simmsimaging]

The problem is in the .exr format. If I saved the render as an hdr there is no white line. No idea why, just pointing it out here for future reference.


b

[vlado]

Which program did you use to check out the elements? Also what antialiasing filter did you use?

Best regards,
Vlado

[simmsimaging]

I don't use the anti-aliasing filters at all, and the edge effect shows up in the MFB, the VFB, and in Photoshop. It's only apparent with exr files so I thought it was not actually a Vray issue, but I can send you one if you want to have a look at the exr.

b

[vlado]

So if you save to a .hdr file, the issue no longer shows in the frame buffer?

Best regards,
Vlado

[simmsimaging]

So if you save to a .hdr file, the issue no longer shows in the frame buffer?

Best regards,
Vlado

Yep, that is correct.

b

[vlado]

In that case would be best if I can get the scene

Best regards,
Vlado

[simmsimaging]

Okay, I will email you a link when I get it uploaded.

b