Multimate element leaves 1 pixel edge in objects

[Svetlozar Draganov]

I will pm u the scene cause i cant share it, its an ongoing project but look at these 2 images. The one is rgb with element, the other is just the matte with no light/gi/maps etc. Ya maybe making multimatte only behave different is the solution. How can i send u the scene in private or doesnt needed it? thanks

Send the scene to support@chaosgroup.com with subject "In attention of Svetlozar Draganov" and include a link to this thread for a reference.

Please include the two states of the scene, the one that generates the proper masks and the other one with the bad sampling.

[Neilg]

Alpha doesnt need samples, u can render anything without lights or color information and alpha is perfect.

Alpha does need samples - you probably already have a difference in color in the base so it knows where to put them.

I also gave you an actual solution - change your AA method to the bucket sampler and raise the minimum samples to 4. throw a black material on everything, turn off lights/GI, and you will get sampling in your multimattes.