Why don't more art programs use B-spline or even NURB curves (which generalize b-splines and beziers) ? I'm not just blaming Photoshop. Every art program I've tried uses only beziers - it's ridiculous.
B-spline curves follow the control points much better than bezier curves do.
For those who doubt, try for example the applets on this page:
5. B-Spline Curves
In particular, try the one at the bottom of the page, where you the control points actually are PART of the curve (now there's an obvious idea...).
NURBs are even better still, since they're more flexible. They're like B-splines, but you can alter the 'sharpness'/weight of each control point in an intuitive way (in fact most 3D programs support them).
I'm guessing bezier curves are simpler for the programmers to implement or because it's "always been done that way", but that's no excuse for a program the standard of Photoshop's calibre.
B-spline curves follow the control points much better than bezier curves do.
For those who doubt, try for example the applets on this page:
5. B-Spline Curves
In particular, try the one at the bottom of the page, where you the control points actually are PART of the curve (now there's an obvious idea...).
NURBs are even better still, since they're more flexible. They're like B-splines, but you can alter the 'sharpness'/weight of each control point in an intuitive way (in fact most 3D programs support them).
I'm guessing bezier curves are simpler for the programmers to implement or because it's "always been done that way", but that's no excuse for a program the standard of Photoshop's calibre.
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