Render Mask halos around objects

[Alex_M]

I'm getting halos around objects rendered with Render Mask. I'm using the bucket sampler with BF+LC. Please check the attached screenshot, particularly the ribs of the black side table.

[vlado]

If you clear the VFB before the render, do you still get the bright edges?

Best regards,
Vlado

[Alex_M]

Ok, a bit more info. If I clear VFB before doing Render Mask, halos don't appear. Also, the side table in the above image was initially white. Then I made it black and rendered with Render Mask without clearing VFB. Maybe this is why the white halos appeared? Is there a way to get clean edges without clearing VFB?

[ramon_perez]

Having the same issue when rendering (RT-GPU) mostly when using VraySky and then saving as a PNG+alpha.

[Alex_M]

Any update on this issue? Is it due to my Vray version?

[Zdravko.Keremidchiev]

Is there a way to get clean edges without clearing VFB?

This is how render mask works. If you want to render without the halo effect you need to clear the VFB.

[Alex_M]

Ok, thanks.