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I'm running a scene in 1.5 right now, all lambert RGB242 materials, for calibration. Just furniture in front of a backdrop with some emitter planes. It's at SL10, and has a bunch of bright red fireflies in it that don't appear to be going away. The preview image shows black fireflies in the same locations. I did the same thing with the same scene in 1.2 last week and didn't notice this. Bug / feature / byproduct / user error?

EDIT: They seem to be multiplying as the SL increases.

I would suggest to send this scene to NL.

Kabe

Also try to save it out as HDR and look into Photoshop. It might be a bug in
the MXI display, not a problem with the renderer as such.

Kabe

Nope, the fireflies are in the saved hdr file too. However, the fireflies are black instead of red in both the saved jpg and hdr files.

I also had these solid red pixels start appearing. Doing more tests in the am, but so far, this has not been a smooth transition just yet....

I don't know if it's the same thing, but I had a random scattering of black/brown squares in my first render. It turned out to be caused by instanced geometry in Maya, I de-instanced them and the random squares went away.

Probably not the same thing- this scene was built in Studio and has nothing particularly unusual that I can think of.

oh no! the fireflies are back ... thought we got rid off them with 1.0

I didn't missed them at all

I haven't seen fireflies in forever... please send a test scene.

_Mike

To whom do I send it, and is there an FTP server or something? This would be too big to email. In the meantime, here is the render.

If I change the material from Lambert to 99% rough, they disappear.

superbad, if you can send the scene to me (tom@nextlimit.com), we'll immediately check what's going on.

I'd love to, but it's 48Mb. Is there an FTP server I can put it?

This is exactly the same scene. Only change was to uncheck Lambert, and set roughness from 100% to 99%. The lighting solution seems very different. And there is one firefly that popped up in the center of the scene (and hey look, it's red!), so my Lambert theory seems to be incorrect.



So fireflies aside, maybe you can help here Mike: I'm trying to use your method to get the exposure right. In the past I would have just eyeballed it, but here I am using a 242 white material to calibrate the exposure. Clearly, there is a big difference between what the Lambert is giving me (washed out, low contrast), and the 99% (strange and contrasty). Maybe I need to rethink my lighting because I don't like either one, but which one do I trust?

Superbad, I received the scene, thanks.

My several attempts with your default settings (lambert) didn't produce black dots here. Can you give us detailed information about your hardware and maxwell version please?