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
Sent: Friday, April 18, 2014 11:44 AM
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.
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