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What are B-splines?
I often see people talk about how B-splines are so good for roto work and that After Effects can’t do them, so tools like Combustion or Silhouette Roto are preferred for roto work.
Well I have tried the demo version of Silhouette Roto to try out he b-splines in it. But I can’t tell any difference from After Effect’s “rotobeziers”. They both seemed to behave exactly the same to me.
Would anyone mind explaining these b-spline things to me? -
3 Replies
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From some loony maths page…
“B-splines represent a particular example of a convolutional basis. Because of their compact support and other attractive numerical properties, B-splines are a good choice of the basis set for the forward interpolation problem and related signal processing problems Unser (1999). According to Th
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Thanks for thoroughly confusing me :p
I still don’t really understand the difference between AE’s rotobezier tool and these B-splines though. The description of the b-spline on that site seems like exactly the same thing as the rotobeziers.
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I’m sad. I’d completely forgotten that adobe introduced that feature. Just played with it; feels nice and springy. I wonder does illustrator have it too? Seems good for gooey logos. I see what you mean though. But i’m thinking that rehrers illustration shows the bezier control cage points surrounding the object, as opposed to sitting directly on it? (if I’d ever actually used commotion, this answer would be much shorter..)
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