Hi Gabor,
Personnaly i render unfiltered double res ppass and downsize the result to 
generate antialiasing. It's not perfect but make the deal for so many cases.
I suppose this can also be handled with a coverage pass and thus perfect 
results, but i had never did it.
cheers
philhub




----- Mail original -----
De: "Gabor L. Toth" <glt...@gmail.com>
À: "Nuke user discussion" <nuke-users@support.thefoundry.co.uk>
Envoyé: Mardi 20 Novembre 2012 18:27:32
Objet: [Nuke-users] mask from position pass methods


Hi, 

I assume many of you are using tools like mask3d, or P_matte/P_ramp (thanks the 
authors), that creates a mask from a position pass (or with grading a depth 
pass). I use these for years now, but I always wanted to ask, how do you treat 
the edges? What type of positionpass do you use? I use filtered and also 
unfiltered, but when I create the mask, especially when selecting an area in 
front a of another area further away, I always have to hack the edges with 
erodes/rotos etc. Does anyone have a method that lets user select the desired 
area and somehow finetune the motionblurred edges without any hack like this? 
Or is there a special difference pass that can be outputted from 3d render, and 
helps in this situation? I mean when rendering to separate layers is not an 
option, and without deep samples. Any help appreciated, thanks 

Gabor 


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