I agree plenty of reasons to have negative values. It's a heavy node already, anything wrong with the clamp node, or would you want it per stroke?
Howard > On 19 Apr 2014, at 02:59, Frank Rueter|OHUfx <[email protected]> wrote: > > I have used roto in the past to work on data channels such as motion vectors, > in which case negative values are quite important. > > It's more of an educational problem than a software feature problem I think, > but I guess a clamp option might be a reasonable thing to request. > > > > > >> On 19/04/14 07:01, Nathan Rusch wrote: >> Keep in mind that those same blending modes apply to paint strokes as well, >> where there may actually be a reason to use straight subtraction. >> >> -Nathan >> >> >> From: Deke Kincaid >> Sent: Friday, April 18, 2014 11:44 AM >> To: Nuke user discussion >> Subject: Re: [Nuke-users] from/minus in roto node >> >> Hi John >> >> To give you a non answer. Fortunately or unfortunately with all our tools >> we give you enough rope to hang yourself with. None of our tools hide >> anything from the user and do the same math in the roto node that the merge >> node. As you mentioned though we should probably have something like a >> mask/stencil and also something like a clamp black/white option in the roto >> node. >> >> I would email support and have them add a feature request for this. Bring >> up to them why a from/minus is not good and why a mask/stencil is better. >> [email protected] >> >> -- >> Deke Kincaid >> Creative Specialist >> The Foundry >> Skype: dekekincaid >> Tel: (310) 399 4555 - Mobile: (310) 883 4313 >> Web: www.thefoundry.co.uk >> Email: [email protected] >> >> >>> On Fri, Apr 18, 2014 at 8:38 AM, John Mangia <[email protected]> wrote: >>> Wondering if one of the Foundry folks might be able to answer why there is >>> a from/minus layer mode in the roto node when it ends up creating negative >>> values (something you never want in an alpha). It's been like this forever >>> and I'd rather have mask/stencil modes available. Coming from Shake I've >>> always done my in/out roto in separate nodes but I was noticing some folks >>> who are learning nuke using the internal roto modes and being unaware of >>> the negative value problem. Thanks. >>> >>> -- >>> John Mangia >>> >>> 908.616.1796 >>> [email protected] >>> >>> _______________________________________________ >>> Nuke-users mailing list >>> [email protected], http://forums.thefoundry.co.uk/ >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> >> >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> >> >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > -- > <ohufxLogo_50x50.png> vfx compositing | workflow customisation and consulting > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
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