Black and white specks when rendering

[Semus]

I'm not sure if this is the correct place to ask this question, so feel free to move this.

I'm having the famous black and white speck issue when rendering chrome using Vray. I've attached an image of an example of the issue. The material used is the basic Vraymtl with the refl. gossiness set to 1.0

If it's set any lower it obviously blurs the reflections but in order to get rid of the specks I would have to lower it considerably and therefore removing the chrome look I need. I've had this issue before but cannot remember how I fixed it.

I should mention that this rim has been merged into another scene set up specifically for rendering. I'm not sure if that has anything to do with it, and I'll try to set up a scene with the original file just to be sure.

[kriscabrera]

Check your aa in the renderer i use dmc with min 4 max 4 usually works well also could be your gi settings or if not check your light subdivisions.

[Semus]

Thanks for the quick reply. I checked the DMC settings and it appears that I was using the default 1,4 settings. I changed them and managed to fix the issue. It's looking much better.

[kriscabrera]

Yup much better min 4 max 4 is usually the best result and quick. It was causing those artifacts because your rim is reflecting a square light and its reflecting hard edges so you need to sample it more.

[SvdM]

I found that you could get away with max samples x4 min x1 easily when working with pretty much any materials EXCEPT chromed or mirror finish materials, then you have to crank the samples up... you can even go min x4 max x16 to get those very fine highlights really anti-aliased, but that you can do in your very last render .

You can also soften your reflection plane with a fall-off/gradient ramp... it should also help with not having such hard reflections - that is if you want to soften it too...