Strange reflections on a mirror

[AltoR]

Hi,

In a very simple interior scene lit by 4 IES VRay lights, VRay renders some small bright spots on the surface of a mirror. They seem to be some reflection spots. It is weird because Reflection Glossiness of the miror is set to 1. Also my rendering settings are set quite high (IM + LC), it can not be DMC sampler values or noise threshold value so ... Any idea please ?
Sorry but I can't upload any image (it only causes a blank page to appear): maybe because of new Firefox version (v 20, but I tried with IE, same issue) ?! If you want I can provide you the scene via email.
Thank you

[Macker]

Without an image to look at, it's going to be pretty hard to help diagnose your problem.

I had a problem with "fireflies" on a previous project, so I created a few render elements to help me narrow down the source of the problem; RawReflection, RawRefraction & RawLighting were the ones most useful to me - I found the noise quite clearly showed up in the reflection channel - and was being caused by a reflection of a reflection, from what I could gather.

[Zdravko]

Feel free to send us your output to: support@chaosgroup.com
Also as Macker mentioned it will be useful if you could add GI, RawReflection, RawRefraction and RawLighting passes.

[AltoR]

I rendered RawReflection & RawLighting passes and I understood that this is a reflection problem because the RawReflection pass is very noisy. I read further VRay manual on spot3d.com and better understood how it works, thanks to ChaosGroup Universal settings explanations. I raise max rate of the DMC image sampler and my problem is solved now
Thank you for your answer both of you.